FR3081715A1 - ROCKER DEVICE FOR REHABILITATION OF AT LEAST ONE LOWER MEMBER OF THE HUMAN BODY - Google Patents

Abstract

The rocking device (100) comprises a carrier plate (101), the carrier plate (101) having an upper face (102) intended to support a person. The rocking device comprises at least one wedge (105, 106) for the foot, said wedge (105, 106) being arranged on the upper face (102).

Description

ROCKER DEVICE FOR REHABILITATION OF AT LEAST ONE LOWER MEMBER OF THE HUMAN BODY

TECHNICAL FIELD OF THE INVENTION The technical field of the invention relates to that of rocking devices, in particular for the rehabilitation of the gastrocnemius and soleus muscles of at least one lower limb of a person. More particularly, the invention relates to a rocking device comprising a support plate, this support plate comprising an upper face intended to support a person.

STATE OF THE ART There are rocking devices, also called rocking plates, used in particular by physiotherapists during the rehabilitation of patients also called more generally "persons" thereafter. A tilting device generally comprises a tray having an upper face on which a person will be able to climb. Furthermore, the plate has a lower face, generally oriented towards the ground, and on which a hemisphere can be fixed, resting punctually on the ground. Such a rocking device is also known by the name of Freeman plate or proprioception plate. The rocking device is then used to work on the proprioception of the lower limbs of the person. When the person is standing on the upper face of the platform, the exercise generally consists in balancing on the platform which has become unstable due to the occasional support of the hemisphere on the ground. Such a rocking device can be used in knee and ankle rehabilitation exercises, but also to improve proprioception, flexibility or strengthening of the muscles, tendons and ligaments of the lower limbs. Although it can stretch muscles of the lower limbs, such a rocking device is not suitable for work focused on stretching the gastrocnemius and soleus muscles of the person's lower limbs.

French patent application FR2473306 describes a proprioceptive rocker rehabilitation device with interchangeable wedges for positioning the tiltings and limiting their amplitudes. Here again, although it makes it possible to stretch muscles of the lower limbs of a person, such a rehabilitation device is not suitable for work focused on the stretching of the gastrocnemius and soleus muscles of these lower limbs.

The stretching of the gastrocnemius and soleus muscles of the lower limbs of a person is generally performed to treat a retraction of the gastrocnemius and soleus muscles. When the gastrocnemius and soleus muscles of one of the lower limbs of the person are retracted, this causes an equinus of the foot of this lower limb from which it ultimately results in the creation of a flat foot which, little by little, will lose its propulsive capacity. It is understood that there is a need to develop a rocking device making it possible to optimize the stretching of the retracted gastrocnemius and soleus muscles of one or each of the lower limbs of the person to counter their retraction.

OBJECT OF THE INVENTION The aim of the invention is to allow stretching of the gastrocnemius and soleus muscles of at least one of the lower limbs of a person, in particular to allow effective rehabilitation of these gastrocnemius and soleus muscles when they are retracted, or to allow a practitioner to more easily diagnose a retraction of the gastrocnemius and soleus muscles of the lower limb.

We tend towards this goal thanks to a rocking device comprising a support plate, the support plate comprising an upper face intended to support a person, this rocking device being characterized in that it comprises at least one wedge for foot , said shim being arranged on the upper face.

Such a rocking device has the advantage of correctly positioning the foot of a lower limb of the person standing on the support plate in order to obtain a satisfactory lever arm on the gastrocnemius and soleus muscles of this lower limb for stretch them appropriately, especially when these gastrocnemius and soleus muscles are retracted. In particular, the wedge makes it possible to act on a subtalar pronation of the foot in contact with the wedge in order to position said foot in a state suitable for stretching the gastrocnemius and soleus muscles of the lower limb comprising this foot.

The rocking device can include one or more of the following characteristics:

• the rocking device is configured to present a tilting state in which:

- the rocking device is in tilting stop,

- The upper face of the carrier plate is inclined relative to the horizontal at a reference angle of inclination;

• the wedge is shaped to cooperate with an arch of one of the feet of the person standing on the support plate so as to position and maintain said foot in inversion;

The wedge has a surface for inverting the foot, the inversion surface comprising a plane of symmetry dividing said inversion surface into two parts symmetrical with respect to this plane of symmetry, and each of the two parts of the inversion surface is delimited by first, second and third curves such as:

- the first curve is included in the plane of symmetry,

the second curve is included in a first plane perpendicular to the plane of symmetry, and in particular parallel to a plane in which the upper face of the carrier plate is included,

- The third curve is included in a second plane perpendicular to the plane of symmetry and perpendicular to the first plane;

• the carrier plate is configured to pivot about a pivot axis allowing the tilting of the rocking device to be implemented;

• the shim is arranged vertically above the pivot axis when the upper face of the carrier plate is horizontal;

• the rocking device comprises at least one stop projecting from a lower face of the carrier plate, said stop making it possible to limit the tilting amplitude of the rocking device, in particular by bringing the stop into contact with the ground;

• the rocking device includes:

- a measuring member configured to determine, during a passage of the rocking device in its tilting state, the holding time of the rocking device in said tilting state,

- a signal generation device, said signal being generated when the holding time reaches a predefined time threshold;

• the wedge is of variable shape;

• the rocking device comprises at least one baropodoscope;

• the rocking device includes a counter configured to generate at least one data item relating to the use of the rocking device.

The invention also relates to a postural study device for a person, this postural study device comprising:

- a rocking device as described,

- an electronic device configured to determine at least one value representative of an angle of inclination of a part of a lower limb of the person with respect to the horizontal when the person is standing on the carrying platform and the limb lower comprises a foot cooperating with the wedge.

The postural study device can be such that:

- said angle of inclination of the part of the lower limb relative to the horizontal corresponds to an angle formed, between a horizontal plane and the part of the lower limb, in a plane parallel to the sagittal plane of the person,

- said part of the lower limb is the fibula of this lower limb,

said tilting device is configured to present a tilting state in which:

o the rocking device is in tilting stop, o the upper face of the carrier plate is inclined relative to the horizontal at a reference angle of inclination,

- the electronic device is configured to:

o determine a first value representative of the angle of inclination of the part of the lower limb relative to the horizontal when the upper face of the support plate is positioned horizontally, o determine a second value representative of the angle d inclination of the part of the lower limb relative to the horizontal when the upper face of the support plate is inclined according to the reference angle of inclination, o determine an indicator of posture of the person taking into account the first and second values.

Advantageously, within the postural study device, the posture indicator corresponds to a variation between the first and second values, and the postural study device comprises a memory for storing values of the posture indicator. determined during different uses of the rocking device.

The invention also relates to the use of a rocking device as described for the rehabilitation of the gastrocnemius and soleus muscles of at least one lower limb of the person when he is standing on the support plate.

Brief description of the drawings The invention will be better understood on reading the description which will follow of at least one particular embodiment, given solely by way of nonlimiting example and made with reference to the accompanying drawings in which :

- Figure 1 illustrates a perspective view of a particular embodiment of a rocker device according to the invention;

- Figure 2 is a side view of the rocking device of Figure 1 in a state of equilibrium;

- Figure 3 is a side view of the rocking device of Figure 1 in the tilting state;

- Figure 4 illustrates a perspective view of a variant of the embodiment shown in Figure 1, and for which a single wedge for foot is arranged on the carrier plate;

- Figure 5 illustrates a perspective view of the rocking device of Figure 1 devoid of wedges for feet;

- Figure 6 illustrates a perspective view of a wedge for foot;

- Figure 7 is a side view of the rocking device in the tilting state according to an embodiment of the invention;

- Figure 8 illustrates a perspective view of a stop of the rocking device;

- Figure 9 is a bottom view of the rocking device of Figure 1 devoid of the stop of Figure 8;

- Figure 10 illustrates a side view according to an embodiment of the rocking device in a state of equilibrium;

- Figure 11 illustrates the tilting state of the rocking device associated with the embodiment of Figure 10;

- Figures 12 and 13 illustrate a postural study device according to the states of balance (Figure 12) and tilting (Figure 13) of the rocking device that includes this postural study device.

In these figures, the same references are used to designate the same elements.

Furthermore, the elements shown in the figures are not necessarily shown on a uniform scale to make the figures more readable.

Detailed description A person, and more particularly a patient, within the meaning of the present description comprises in particular two lower limbs also called lower limbs of the human body. Each lower limb has a foot, gastrocnemius muscles, and a soleus muscle. For a lower limb, the gastrocnemius muscles are formed by a muscle called the medial twin and by a muscle called the lateral twin, in known manner the gastrocnemius muscles of the same lower limb are also called twin muscles. The gastrocnemius muscles of a lower limb join with the soleus muscle of this lower limb to form the sural triceps muscle. A practitioner within the meaning of the present description is in particular a doctor who can prescribe exercises using a rocking device as described below so as to stretch, and therefore re-educate, the gastrocnemius and soleus muscles of each lower limb of the person for which his gastrocnemius and soleus muscles are retracted.

Although the retraction of the gastrocnemius and soleus muscles can only concern one of the two lower limbs or each of the two lower limbs, the consequences of this retraction for a given lower limb are described below, these consequences can therefore apply to the two lower limbs. The retraction of the gastrocnemius and soleus muscles of the lower limb concerned causes the foot of this lower limb to be placed in equinus as mentioned above. The equinization of the foot disturbs the plantigrady of the person in static and the progress of the step of the person in dynamic. Furthermore, the equinization of the foot disrupts the second pivot of the walk (formed by the ankle) and will transfer the stresses downstream on the sub-talar articulation of the foot, the midfoot and the forefoot of this foot. . This equine positioning of the foot generally results in a sagging of the arch of the foot with a subtalar pronation of this foot. As the foot must be plantigrade and the articular movement of the ankle is blocked by the retraction of the gastrocnemius and soleus muscles, the movement will be abnormally in the sub-talar joint of the foot which will be positioned to compensate for this retraction with diving from the talar head of the foot towards the ground, and progressive distension of the spring ligament also called calcaneo-navicular spring ligament of the foot, and creation of a flat foot which little by little will lose its propulsive capacity. The action of the calcaneal tendon of the lower limb, connecting the foot to the gastrocnemius muscles and the soleus muscle, takes place mainly on the calcaneal support foot (comprising the calcaneus, the cuboid, the fourth ray and the fifth ray). Thus, due to the retraction of the gastrocnemius and soleus muscles, the subtalar joint takes an unsuitable position for effective stretching of these gastrocnemius and soleus muscles. The rocking device described below proposes to oppose this inappropriate position by tending to put the foot back in a suitable position making it possible to effectively stretch the gastrocnemius and soleus muscles of the lower limb comprising this foot.

As shown in Figures 1 to 3, the rocking device 100 according to one embodiment of the invention comprises a carrier plate 101. This carrier plate 101 has a support face (preferably planar) of a person, also called upper face 102 intended to (that is to say configured so as to) support a person. Thus, the upper face 102 is intended to receive the weight of the person when he is standing on the carrying tray 101. The tray 101 is said to be “carrying” because its function is to support the person when he is standing on the face upper 102. The dimensions of the support plate 101, and more particularly of its upper face 102, are preferably adapted so that the toes and the heels of the person standing on the support plate 101 are in contact with the upper face 102, this allowing the person standing on the carrying platform 101 to have a better balance. The upper face 102 is opposite to a lower face 103 of the carrier plate 101. The concepts of “lower” and “upper” are here in particular given according to the height relative to the ground 104 when the rocking device 100 is in contact with (that is to say rests on) the ground 104 in a configuration known as of use of the rocking device 100. Precisely, FIGS. 2 and 3 illustrate the configuration of use according to two different states of the rocking device 100 by relative to the ground 104. In FIG. 2, the rocking device 100 is in a state called “equilibrium” in particular in which the upper face 102 is horizontal, and in FIG. 3 the rocking device 100 is in a state called "tilting" in particular in which the upper face 102 is inclined relative to the horizontal. In the states of equilibrium and tilting, the rocking device 100 rests on the ground 104. In the present description, the horizontal is considered to be parallel to the ground 104 on which the rocking device 100 rests. The rocking device 100 shown in Figures 1 to 3 comprises at least one wedge 105, 106 for foot, and more particularly two wedges 105, 106 for feet. The shim (s) 105, 106 are arranged on the upper face 102 of the carrier plate 101: in other words the shim (s) 105, 106 are each projecting from the upper face 102. The shim (s) 105, 106 can form, with the carrier plate 101, a one-piece assembly (that is to say in one piece), or can be mounted on the carrier plate 101 in a fixed or removable manner. The wedge 105, 106 has the advantage of making it possible to position the foot of the lower limb having a retraction of its gastrocnemius and soleus muscles to optimize the stretching of these retracted muscles during the tilting of the rocking device 100. As mentioned above , the retraction of the gastrocnemius and soleus muscles of the person can be symmetrical, that is to say concerning the two lower limbs, or be asymmetrical, that is to say concern only one of the lower limbs. Thus, the wedge or wedges 105, 106 make it possible to properly position the foot (s) to neutralize the compensation of the subtalar joint of the foot (s), and thus improve the stretching of the gastrocnemius and soleus muscles of each member for which its gastrocnemius and soleus muscles are retracted. Such positioning of the foot to neutralize the compensation of the subtalar joint is also called positioning of the foot in inversion. The inverted positioning of the foot allows its arch to conform to the shape it should adopt if the gastrocnemius and soleus muscles of the lower limb containing this foot were not retracted. More particularly, the wedge 105, 106 or each wedge 105, 106 can be shaped to cooperate with an arch of one of the feet of the person standing on the support plate 101 so as to position and maintain said foot in inversion, l he advantage described has been described above, the wedge 105, 106 then allows to act preferentially on the ankle to properly stretch the gastrocnemius and soleus muscles of the corresponding lower limb. The rocking device 100 can also be called rocking device 100 for the rehabilitation of at least one of (in particular of the two) lower limbs of the human body (that is to say of the person), or more particularly device to flip-flop 100 to stretch the retracted gastrocnemius and solar muscles of at least one of (especially the two) lower limbs of the human body (i.e. the person).

To stretch the gastrocnemius and soleus muscles of the lower limbs, exercise can consist of:

position the person 120 (FIGS. 12 and 13) standing on the rocking device 100 with the foot 130 of the lower limb, the gastrocnemius and soleus muscles are retracted, wedged by the wedge 105, if necessary the two feet of the lower limbs are wedged respectively by wedge 105 and by wedge 106 in order to stretch the retracted gastrocnemius and soleus muscles of the two lower limbs,

- then switch alternately from the equilibrium state of the rocking device 100 (Figures 2 and 12) to the tilting state of the rocking device 100 (Figures 3 and 13) from which there results a succession of phases d stretching of the gastrocnemius and soleus muscles (FIG. 13) and relaxation of these gastrocnemius and soleus muscles (FIG. 12) by positioning the rocking device 100 suitably relative to the ground 104.

By “person standing on the rocking device 100”, or even “on the carrier plate 101”, it is understood that the person is standing on the upper face 102 of the carrier plate 101.

Preferably, to properly stretch the gastrocnemius and soleus muscles of each lower limb for which its gastrocnemius and soleus muscles are retracted, the support plate 101 is configured to pivot around a pivot axis 107 (shown in FIGS. 2 and 3, and in dotted line in FIG. 1) allowing the tilting of the rocking device 100 to be implemented. By “rocking of the rocking device 100” is meant its rocking relative to the ground 104. In other words, the rocking device 100 comprises the pivot axis 107 authorizing the inclination of the support plate 101 during the tilting of the rocking device 100 along, and in particular around, this pivot axis 107. Unlike the Freeman half-sphere plate allowing an omnidirectional tilting, the rocking device 100 according to the present invention is preferably such that its tilting is bidirectional, and in particular only bidir ectionnel. By “bidirectional tilting”, it is meant here that the tilting can be done from front to back (the front and the rear being given in particular according to the frame of reference of the person standing on the rocking device 100), in particular thanks to the pivot axis 107, to alternate between the tilting state and the equilibrium state. The pivot axis 107 advantageously makes it possible to properly stretch the gastrocnemius and soleus muscles of each lower limb for which his gastrocnemius and soleus muscles are retracted, in particular when this pivot axis 107 is orthogonal to the sagittal plane of the person when he is standing on the upper face 102, and that his or her feet are wedged by the wedges 105, 106.

Preferably, the shim 105 or the shims 105, 106 are arranged perpendicular to the pivot axis 107 when the upper face 102 of the carrier plate 101 is horizontal. The arrangement of the wedge (s) 105, 106 perpendicular to the pivot axis 107 allows the person standing on the rocking device 100:

- to easily position the rocking device 100 alternately in its equilibrium state and in its tilting state,

- to have a better balance when using the rocking device.

In Figure 4, only a wedge 105 is shown to treat the retraction of the gastrocnemius and soleus muscles of the lower left limb of the person.

Preferably, the shims 105, 106 may be removable. This has the advantage of adapting the rocking device 100 according to each lower limb concerned by the retraction of its gastrocnemius and soleus muscles: it is possible to keep the two wedges 105, 106 mounted on the carrier plate

101 on its upper face 102 (FIG. 1), or only one of the shims 105, 106, mounted on the carrier plate 101 on its upper face 102 (FIG. 4).

It has been mentioned above that the rocking device 100 is configured to have a tilting state, in particular when it rests on the ground 104. In this tilting state, the rocking device 100 is in abutment with tilting, and the upper face 102 of the carrier plate 101 is inclined relative to the horizontal at a reference tilt angle a _re f (Figure 3): in other words the reference tilt angle a _re f is formed between the upper face 102 of the rocking device 100 and a plane parallel to the horizontal represented in FIG. 3 by the ground 104. The tilting abutment makes it possible to limit the reference tilt angle a _re f to a value chosen to stretch the gastrocnemius and soleus muscles appropriately for each limb for which its gastrocnemius and soleus muscles are retracted. Thus, the rocking device 100 can remain in the tilting state while allowing the desired stretching. In particular, the value of a _re f can be adapted to the quantification of retraction of the gastrocnemius and soleus muscles of the or each of the lower limbs so that the reeducation takes place in the best conditions, the aim being in particular that the person does not lose the balance, and does not fall when passing from the equilibrium state to the tilting state.

According to a particular embodiment, the rocking device 100 comprises the two shims 105, 106, and the spacing between the shims 105, 106 is adjustable. In other words, the rocking device 100 is configured to allow an adjustment of the spacing between the shims 105, 106. The advantage associated with this adjustment of the spacing between the shims 105, 106 is that it makes it possible to adapt the device rocker 100 with different body shapes likely to use the rocker device 100. By “adjusting the spacing between the wedges 105, 106”, it is meant that each wedge 105, 106 can be mounted at different locations on the face upper 102 of the carrier plate 101. It is then understood that there is a need to find a technical solution making it possible to facilitate this mounting of the shims 105, 106 at different locations. To meet this need, the upper face 102 of the carrier plate 101 may comprise (FIG. 5) a plurality of pairs of holes 108a, 108b, each pair of holes 108a, 108b being associated with a given location. Furthermore, each wedge 105, 106 may comprise at least two projecting elements 109a, 109b (FIG. 6) insertable in the holes of a pair of holes 108a, 108b to arrange and maintain the wedge 105, 106 in a chosen associated location to the pair of holes 108a, 108b. FIG. 5 represents the rocking device 100 devoid of shims 105, 106 so as to display three pairs of holes 110a, 110b, 110c (surrounded by dotted lines) each associated with a possible location for the shim

105 intended to wedge the left foot, and three pairs of holes 111a, 111b, 111c (surrounded by dotted lines) each associated with a possible location for the wedge

106 intended to wedge the right foot. The two protruding elements 109a, 109b of the wedge 105, 106 ensure satisfactory maintenance of the wedge 105, 106 relative to the carrier plate 101, more than two protruding elements 109a, 109b per wedge 105, 106 allows 'improve the hold of the wedge 105, 106 with respect to the shear stresses which the wedge 105, 106 can undergo parallel to the face of the wedge 105, 106 oriented towards the upper face 102. Preferably, each wedge 105, 106 four projecting elements inserted into four holes of the support plate 101 to improve the hold of the shim 105, 106 compared to the support plate 101. Of course, any other type of variant making it possible to implement the function of adjusting the spacing shims 105, 106 on the upper surface 102 can be applied to the present rocking device 100. It was mentioned above that the reference tilt angle a _re f could be chosen as a function of the quantifi cation of retraction of the gastrocnemius and soleus muscles of at least one of the lower limbs. This quantification of retraction of the gastrocnemius and soleus muscles for a lower limb can in particular be established during a test before using the rocking device 100, for example by comparing the angle of dorsal flexion of the foot when the knee of the lower limb is in the flexed position, with the dorsal flexion angle of the foot when the knee of the lower limb is in the extended position. The greater the difference between these two dorsal flexion angles, the greater the retraction of the gastrocnemius and soleus muscles of the corresponding lower limb. Based on this quantification the practitioner can communicate, to the person to use the flip-flop 100, the reference inclination angle? _Ref to be used. The reference tilt angle a _re f can be fixed by means of at least one stop 112, or several stops, of the rocking device 100. This or these stops 112 can each protrude from the lower face 103 of the support plate 101 (Figures 1 to 5). Each stop 112 can form, with the support plate 101, a one-piece assembly (that is to say in one piece), or can be fixedly or removably mounted on the lower face 103. Each stop 112 allows limit the amplitude of tilting of the rocking device 100, in particular by bringing the stop 112 into contact with the ground 104. Furthermore, to take account of the quantification of retraction of the gastrocnemius and soleus muscles of the or each of the lower limbs, there is a need to find a solution to adjust the value of this reference tilt angle a _re f. To meet this need, the stop 112 can be removable. Thus, by removing the stop 112, the reference tilt angle a _re f will be greater as shown in FIG. 7 for which the rocking device 100 is devoid of the stop 112, and is in the tilting state. According to a particular embodiment, the stop 112, illustrated in FIG. 8, comprises an elongated member 113 (visible in FIGS. 1 to 5) provided with two projections 114a, 114b forming male elements which are inserted into holes 115a, 115b, formed in the lower face 103 (FIG. 9), forming female elements into which the male elements are inserted when the removable stop 112 is mounted on the lower face 103.

As shown in Figures 1 to 5, 7 and 9, the rocking device 100 may include a base 116 allowing the implementation of the tilting of the rocking device 100. In particular, the base 116 has a rounded 117 cooperating with the floor 104 during tilting. This rounding 117 has in particular a profile in an arc of a circle, and the pivot axis 107 in particular passes through the center of this arc of a circle. In fact, during the tilting of the rocking device 100, the latter can cooperate with the ground 104 via this rounded 117, in other words the rocking device 100 can “roll” on the ground via this rounded 117. In this sense, the passage from the equilibrium state to the tilting state (or vice versa) can be achieved by a rotational movement of the rocking device 100 around the pivot axis 107 accompanied by a translation of the rocking device 100 relative to on the ground 104 on which it rests. The rounding 117 may in particular be such that it favors the transition from the state of equilibrium to the state of tilting (or vice versa) while limiting the risks of loss of balance of the person standing on the rocking device. 100: for this, the rounding 117 may have different radii of curvature in different places of the rounding

117. The advantage of such a base 116 is that it allows tilting without requiring a complicated mechanical system, for example with a mechanical axis mounted on uprights connected to the ground.

According to an improvement, the removable stop 112 can be removed and mounted on the base 116 so as to form the pivot axis 107 of the rocking device 100, in particular thanks to a corresponding rounded 117a of the elongated member 113 ( Figures 10 and 11). In this sense, the rocking device 100 can comprise the elongated member 113, and the rocking device 100 can have:

- A first assembly configuration in which the elongated member 113 is mounted on the underside 103 of the carrier plate 101 to form the stop 112 limiting the tilting amplitude of the rocking device

100 (see Figures 1 to 3);

- a second assembly configuration in which the elongated member 113 is mounted on the base 116 to increase the height of the support plate

101 relative to the ground 104 when the carrier plate 101 is horizontal (Figure 10) and in which the tilting amplitude is limited by abutment of one end of the carrier plate 101 against the ground 104 (Figure 11 ) in the failover state.

In the second assembly configuration, the configuration of use implies that the rocking device 100 rests on the ground 104 at least via its elongated member 113. In particular, to authorize the mounting of the elongated member 113 to the base 116, this base 116 may include holes 118a, 118b (visible in FIG. 9) for inserting the projections 114a, 114b (FIG. 8) of the elongated member 113.

Or the shims 105, 106 can advantageously be shaped so as to adapt to a wide range of morphologies. For this, the or each wedge 105, 106 may include a surface 1051 called inversion of the foot as shown in Figure 1. This surface 1051 inversion of the foot is intended to come into contact with the arch of the foot that the wedge 105, 106 reverses. This foot inversion surface 1051 comprises a plane of symmetry dividing said foot inversion surface 1051 into two parts 1052, 1053 symmetrical with respect to this plane of symmetry. The plane of symmetry is in particular orthogonal to the upper face 102 of the carrier plate 101 when the corresponding shim 105, 106 is arranged or mounted there. Each of the two parts 1052, 1053 of the surface 1051 for inverting the foot is then delimited, in particular at its periphery, by first, second and third curves C1, C2, C3 such that:

- the first curve C1 is included in the plane of symmetry,

the second curve C2 is included in a first plane perpendicular to the plane of symmetry, and in particular parallel to a plane in which the upper face 102 of the carrier plate 101 is included when the wedge 105, 106 is arranged or mounted therein,

- The third curve C3 is included in a second plane perpendicular to the plane of symmetry and perpendicular to the first plane.

Furthermore, the surface 1051 for inverting the foot is such that there is continuity between the surfaces of its two parts 1052, 1053 in tangency during symmetry according to the plane of symmetry: the curve C1 is therefore common to two parts 1052 and 1053. This particular shape allows suitable adaptation to the different morphologies of the people likely to use the rocking device 100. By taking the reference frame of orthogonal axes XYZ of FIG. 1 associated with the wedge 105, the associated plane to the axes YZ corresponds to the plane of symmetry, the plane associated with the axes XZ corresponds to the second plane, and the plane associated to the axes XY corresponds to the first plane. According to this standard, X is in particular oriented towards the heel of the person when he is standing on the support plate 101. In particular, the first to third curves C1, C2, C3 are rounded and each have first and second opposite longitudinal ends such as: the first longitudinal end of the first curve C1 is connected to the first longitudinal end of the second curve C2, the second longitudinal end of the first curve C1 is connected to the first longitudinal end of the third curve C3, the second ends longitudinal of the second and third curves C2, C3 are interconnected. Furthermore, the second and third curves C2, C3 form convex edges of the corresponding part 1052, 1053 of the surface 1051 for inverting the foot, and the first curve C1 forms a concave edge of said corresponding part 1052, 1053 of the foot inversion surface 1051. For example, the surfaces of the parts 1052, 1053 can be obtained by interpolation from the three corresponding curves C1, C2, C3. In particular, the surfaces of the parts 1052, 1053 are such that the surface 1051 for inverting the foot which they delimit can take the form of a hyperbolic paraboloid surface. The inversion surface 1051 described in this paragraph is an example suitable for the effective stretching of gastrocnemius and soleus muscles.

For example, and in particular in combination with the reversing surface described above, when the wedge 105, 106 is arranged on the upper face 102, this wedge 105, 106 is particularly suitable for placing the foot in reversal when:

its height relative to the upper face 102 is between 50mm and 60mm, and is in particular equal to 57mm, the height is notably measured parallel to the axis Z of FIG. 1,

- Its dimension along the length of the foot that it is intended to invert is between 90mm and 100mm, and is in particular equal to 96mm, the dimension along the length of the foot is in particular measured parallel to the axis X of the figure 1

- Its dimension according to the width of the foot that it is intended to invert is between 65mm and 80mm, and is in particular equal to 72mm, the dimension along the width of the foot is notably measured parallel to the Y axis of FIG. 1.

According to the embodiment illustrated in Figures 1 to 3, the base 116 and the carrier plate 101 form a single piece, for example of wood. This makes it easier to manufacture the rocking device 100. Of course, other embodiments can be envisaged.

In addition to the rehabilitation exercise mentioned above, the rocking device 100 described above can also be used to diagnose a retraction of the gastrocnemius and soleus muscles of one of the lower limbs or of each of the lower limbs, and / or to follow the evolution of this retraction during rehabilitation. Ideally, when the person standing on the rocking device 100 does not suffer from retraction of the gastrocnemius and soleus muscles of his lower limbs, his posture is maintained during the transition from the state of equilibrium to the state of tilting. , that is to say during the passage in dorsal flexions of the feet due to the inclination of the rocking device 100. By posture is meant the alignment shoulders / hips / knees / ankles in the frontal plane and in the sagittal plane of the person standing on the rocking device 100. However, evaluating this posture in the equilibrium state of the rocking device 100 and in the tilting state of the rocking device 100 proves to be complex and hardly compatible for integration to the rocking device 100 because it would be necessary to measure the variations in the relative positions of the shoulders / hips / knees / ankles induced by the transition from the state of equilibrium to the state of tilting ent. There is therefore a need to find a solution which facilitates the diagnosis and / or monitoring of the development mentioned above. To meet this need, and as illustrated in FIGS. 12 and 13, the invention also relates to a postural study device 119 of a person 120, this postural study device 119 comprising:

the rocking device 100 as described in the present description,

- An electronic device 122, 123 configured to determine, in particular for each lower limb, at least one value representative of an angle of inclination a, of a part 121 of the lower limb of the person 120 relative to the horizontal H1 when the person 120 is standing on the support plate 101 (that is to say on the upper face 102) and the foot 130 of the lower member cooperates with the wedge 105, 106.

The cooperation of the foot 130 with the wedge 105, 106 is such that this foot 130 is wedged by the wedge 105, 106, in particular so as to be positioned and maintained in inversion. Thereafter, the reference to "the angle of inclination a," corresponds to the angle of inclination a, of the part 121 of the lower limb relative to the horizontal H1. During the development of the rocking device 100, it has been established that a variation in the angle of inclination a, established between the value of this angle of inclination a, in the tilting state and the value of this angle of inclination a, in the state of equilibrium could form an indicator linked to the retraction of the gastrocnemius and soleus muscles of this lower limb. The value of this variation in the angle of inclination a can then be an indicator of posture, in particular of variation in posture. In this sense, the electronic device advantageously makes it possible to determine a first value representative of this angle of inclination a, when the upper face 102 is horizontal, and a second value representative of this angle of inclination a, when the face upper 102 is inclined according to the reference angle of inclination Ctref By "value representative of the angle of inclination a, of the part 121 of the lower limb relative to the horizontal", is meant for example the value of this angle, or any other value correlated to this angle and making it possible to deduce this angle.

Preferably (Figures 12 and 13), the electronic device comprises a first accelerometer 122 secured to the carrier plate 101, and a second accelerometer 123 intended to be attached to the lower limb, in particular to the part 121 of this lower limb, by a clamping band of the postural study device 119 to which the second accelerometer 123 is fixed. The first accelerometer 122 is notably integrated in the support plate 101: the first accelerometer 122 is integral in movement with the support plate 101 to allow the detection of tilting state and equilibrium state detection from data from the first accelerometer 122. The first and second accelerometers 122, 123 may be coupled to a gyroscope to improve the measurement accuracy of the first and second accelerometers 122, 123, this gyroscope being used in particular to fix the reference frames of the first and second th accelerometers 122, 123. This tightening band may include a mechanical fastening system, for example with hooks and textile loops (also called Velcro® or scratch). In particular, if it is wished to determine values of the angle of inclination a, for each lower limb in a precise manner, the lower limbs can each carry a second corresponding accelerometer 123, alternatively we can consider that the inclination of the two limbs lower is the same: a single second accelerometer 123 carried by one of the lower limbs is then sufficient to determine the angle of inclination a, for the two lower limbs. The electronic device can acquire data from the first accelerometer 122 and from the second accelerometer 123. The data acquired from the second accelerometer 123 can be used, for example by a calculation unit equipped with suitable software, to determine the angle of inclination a, of at least one or both lower limbs. The data acquired from the first accelerometer 122 can be used to determine, for example by the calculation unit equipped with the adapted software, in which state (state of equilibrium or state of tilting) is the rocking device 100 and for, the if necessary trigger the determination of the angle of inclination a, when it has been determined that the rocking device 100 is in its tilting state and the determination of the angle of inclination a, when it has been determined that the rocking device 100 is in its steady state. Of course, any other embodiment making it possible to obtain the measurement of this angle of inclination a, of the part 121 of the lower limb relative to the horizontal can be used within the framework of the present postural study device 119.

Preferably, the angle of inclination a corresponds to an angle formed between a horizontal plane and the part 121 of the lower limb, in a plane parallel to the sagittal plane of the person 120. The part 121 of the lower limb is notably the fibula of this lower limb. The greater the variation in the angle of inclination a formed between the horizontal plane and the fibula, the more it is considered that the posture of the person standing on the rocking device 100 changes, in this sense this variation of the angle inclination a, is particularly suitable for knowing whether or not the posture of the person is generally maintained between the state of equilibrium and the state of tilting, that is to say during the setting in dorsal flexion of the foot. For example, if the variation in the angle of inclination a, is too large, this indicates that the posture of the person concerned is incorrect, and that this incorrect posture is caused by the retraction of the gastrocnemius and soleus muscles at least one of its lower limbs. Thus, the variation in the angle of inclination a, is a so-called “posture” indicator relevant to linking to the pathology of retraction of the gastrocnemius and soleus muscles of the or each of the lower limbs: the practitioner can deduce from this indicator if yes or no the person is affected by a retraction of the gastrocnemius and soleus muscles. The measurement of this variation in the angle of inclination a, also has an educational purpose in the use of the rocking device 100 and not only in the diagnosis. Indeed, by knowing the value of this variation in the angle of inclination a ,, it is possible to indicate to the person using the rocking device 100 whether he is performing the exercise well or not. Indeed, the exercise is not effective if the patient compensates for his retraction by a change of posture.

It follows from what has been described above that according to a particular and preferred embodiment of the postural study device 119, said rocking device 100 is configured to present the tilting state in which the rocking device 100 is in tilting stop, and the upper face 102 of the support plate 101 is inclined relative to the horizontal according to the reference inclination angle a _re f (Figure 13). In this case, the electronic device is configured for (preferably for each lower limb):

- Determine, in particular using the first and second accelerometers 122, 123, a first value representative of the angle of inclination a, of the part 121 of the lower limb relative to the horizontal when the upper face 102 of the plate carrier 101 is positioned horizontally,

- Determine, in particular using the first and second accelerometers 122, 123, a second value representative of the angle of inclination a, of the part 121 of the lower limb relative to the horizontal when the upper face 102 of the plate carrier 101 is inclined according to the reference inclination angle a _re f,

- determine a posture indicator of the person taking into account the first and second values, this posture indicator being in particular the variation between the first and second values corresponding respectively to the value of the angle of inclination a, when the face upper 102 of the support plate 101 is positioned horizontally and at the value of the angle of inclination a, when the upper face 102 of the support plate 101 is inclined according to the reference angle of inclination a _re f.

This particular embodiment has the advantage of determining the posture indicator simply without having to study different relative positions between the shoulders / hips / knees / ankles. Furthermore, tests with different people using the rocking device 100 have shown that the angle of inclination a ,, when the upper face 102 of the carrier plate 101 is positioned horizontally, can be different depending on the people, this is why one seeks to determine this first value, in particular by measurement, and that one does not take an invariable "reference" for all the people having to use the rocking device 100. The determinations of the first and second values and of the posture indicator can in particular be produced by a processor executing adapted instructions using data acquired from the first and second accelerometers 122, 123.

It follows from what has been described above that the invention also relates to a postural study method comprising:

a step of placing the rocking device 100 on the ground 104 (FIG. 2),

a step in which the person 120 stands on the upper face 102 of the support plate 101 (FIGS. 12 and 13) so that the foot 130 of one of its lower limbs cooperates with the wedge 105, 106 of the device to rocks 100, or in such a way that its two feet cooperate with the wedges 105, 106,

a step of determining the first value representative of the angle of inclination a, of the part 121 of the lower limb, the foot of which cooperates with the wedge 105, 106, relative to the horizontal H1 (represented by a line in dotted lines) when the upper face 102 of the support plate 101 is positioned horizontally H1 (FIG. 12), a step of determining the second value representative of the angle of inclination a, of the part 121 of the lower limb, whose foot cooperates with the wedge 105, 106, with respect to the horizontal H1 when the upper face 102 of the carrier plate 101 is inclined according to the reference inclination angle a _re f (FIG. 13),

a step of determining the posture indicator of the person taking into account the first and second determined values, this posture indicator being in particular the variation of the angle of inclination a, between its value in the state d balance and its value in the tipping state.

This postural study method has the advantages linked to the postural study device 119, in particular it is a suitable solution for detecting a retraction of the gastrocnemius and soleus muscles of at least one of the lower limbs, and it makes it possible to form a means of 'help in the proper use of this means of rehabilitation that is the rocking device 100 by checking that the posture is well maintained between the tilting state and the state of equilibrium.

The retraction of the gastrocnemius and soleus muscles of the lower limb can also be quantified by determining from which value of the talo-crural angle associated with this lower limb, it is found that the person standing on the inclined support plate 101 (that is to say in the tilting state of the rocking device 100) loses its balance. There is a linear relationship between the talo-crural angle and the fibulocalcaneal angle. This fibulo-calcaneal angle corresponds to the angle of inclination a, when the person is standing on the support plate 101 while the rocking device 100 is in a state of equilibrium. Thus, the previously described determination of the second value representative of the angle of inclination a, perhaps combined with a measurement of the angle of inclination reference a _re f of the upper face 102 relative to the horizontal, for example using the first accelerometer 122, to deduce the fibulo-calcaneal angle, then the effective talo-crural angle (application of the linear relation) and to then determine the retraction of the gastrocnemius and soleus muscles inferior member. This measurement of the reference angle of inclination a _re f being of course here associated with a value for which the person standing on the rocking device 100 loses balance.

As part of the postural study device 119 and the postural study method, it was mainly treated the case of a lower limb, of course, the angle of inclination a, or its representative value can be determined for each of the parts (notably the fibulae) of the two lower limbs. In this sense, for the postural study process, the steps for determining the first value and the second value can be implemented for each lower limb, and in this case the posture indicator can be determined by taking into account counts all the first and second values of the angle of inclination a ,.

For a person suffering from retraction of the gastrocnemius and soleus muscles of one of his lower limbs, the linear relationship between the talocrural angle and the fibulocalcaneal angle of this lower limb may be erroneous due to the compensation of the sub-talar: the talo-crural angle will normally be lower because the talus remains equine with its head plunging towards the ground, the wedge 105 makes it possible to limit the effects of the compensation of the sub-talar. The variation of the calcaneal-fibulo angle between the equilibrium state and the tilting state makes it easier to judge the evolution of the retraction, the determination of the variation of the angle of inclination a, allows in particular to help to follow this evolution.

The rocking device 100 may include an electronic module 124 (shown in dotted lines by way of example in FIGS. 1, 4 and 5 because this electronic module 124 is in particular integrated, or arranged according to another formulation, in the device to flip-flop 100 for example in the carrier plate 101) which can provide one or more functionalities to the flip-flop device 100. Examples of functionalities are given below. The electronic module 124 can comprise the means necessary for the implementation of these functionalities such as for example a processor.

The rocking device 100, and therefore where appropriate the postural study device 119, may include at least one baropodoscope 125 (shown diagrammatically in dotted lines in FIG. 4) making it possible to measure the support points of the foot (s) of the person standing on the supporting platform in order to deduce the barycenters from these support points. The baropodoscope can use piezoelectric systems. The baropodoscope 125 can be used to implement a functionality for monitoring the evolution of the retraction of the gastrocnemius and soleus muscles of the lower limb whose foot is resting on the baropodoscope. Indeed, the more the gastrocnemius and soleus muscles of a lower limb are retracted, the more the foot of this lower limb will tend to press via its forefoot on the rocking device 100, in particular in the state of tilting of the device to rocker 100. Thus, two parts of the upper face 102 of the support plate 101 can be formed by soles, these soles each forming a baropodoscope, intended to cooperate with the feet of the person standing on the upper face 102 of the support plate 101 so to measure the support points when using the rocking device 100. The support points are in particular measured when the rocking device 100 is in the tilting state. The electronic module 124 can then comprise at least one baropodoscope, or be connected to this baropodoscope 125 in order to implement a functionality for measuring the support points as mentioned above.

The rocking device 100, and therefore where appropriate the postural study device, may include a counter 126 (shown in dotted lines in Figures 1, 4 and 5 because this counter 126 is in particular arranged in the rocking device 100 for example in the carrier plate 101) configured to generate at least one item of data relating to the use of the rocking device 100. For example, the counter 126 makes it possible to count the number of uses of the rocking device 100, and / or the number of days on which the rocking device 100 has been used at least once, and / or the actual time of use of the rocking device 100. This has the advantage of obtaining statistics to inform the user or his practitioner on the quality of the rehabilitation of the gastrocnemius and soleus muscles of each member for which their gastrocnemius and soleus muscles are retracted. In particular, the electronic module 124 includes this counter 126 to implement a statistical functionality.

To improve the stretching of the gastrocnemius and soleus muscles of each member for which their gastrocnemius and soleus muscles are retracted, it is preferred that the duration of the stretching of these muscles of the person standing on the rocking device 100, while the rocking device 100 is in the tilting state, is adapted. Thus, there is a need to notify the person when he can bring the rocking device 100 from its tilting state (FIG. 13) to the equilibrium state (FIG. 12) to release the stretching mentioned above. . To meet this need, the rocking device 100 may include a measuring member 127 (shown in dotted lines in FIGS. 1, 4 and 5 because this measuring member 127 is in particular arranged in the rocking device 100 for example in the support plate 101), also called a chronometer, configured to determine / measure, during a passage of the rocking device 100 in its tilting state notably detected by using the first accelerometer 122, the time of holding the rocking device 100 in said state of failover. Furthermore, the rocking device 100 can comprise a member 128 for generating a signal (shown in dotted lines in FIGS. 1, 4 and 5 because this member 128 for generating a signal is in particular arranged in the rocking device 100 by example in the carrier plate 101), for example a man-machine interface, said signal being generated when the holding time reaches a predefined time threshold. This predefined time threshold can be between one minute and two minutes for the stretching mentioned above to be effective. The signal can be generated by a loudspeaker (audible signal) or by a display (visual signal) when the predefined time threshold is reached. The predefined time threshold can in particular be a duration selected with the help of the practitioner. In particular, the electronic module 124 includes the measurement device 127 and the signal generation device 128 for implementing an exercise aid functionality.

The rocking device 100, or more generally the postural study device 119, may also include a memory for storing variations in the angle of inclination a ,. This makes it possible to establish a curve of the evolution of the variation of the angle of inclination a, during different uses of the rocking device 100 of the postural study device 119, to follow the progress of the rehabilitation of the person using the rocking device 100. Thus, the practitioner can analyze this curve to carry out rehabilitation effectiveness checks. In other words, preferably when the posture indicator corresponds to a variation between the first and second values of the angle of inclination a, described above, the postural study device 119 comprises a memory 129 for storing values of the posture indicator determined / established during different uses of the rocking device 100. The terms “different uses” may correspond to uses of the rocking device on different days. This memory 129 (represented in dotted lines in FIGS. 1, 4 and 5 because this memory 129 is in particular arranged in the rocking device 100 for example in the carrier plate 101) is in particular integrated into the electronic module 124 to implement a functionality of helps the practitioner to follow the evolution of the retraction of the gastrocnemius and soleus muscles of the or each lower limb. It is understood from what has been described above that the rocking device 100, and in particular the postural study device 119, may include all the electronic means necessary to acquire data relating to the use of the device to rocker 100, and in particular relating to the cooperation of the person standing on the rocking device, to improve the stretching of the gastrocnemius and soleus muscles of each lower limb for which his gastrocnemius and soleus muscles are retracted as part of a grip medical burden of reeducation of these muscles.

In one embodiment, the rocking device 100 can be such that it has two heel locations, these two locations being delimited by cavities formed in the upper face 102. These cavities each have a depth of, for example, 3mm. These cavities make it possible to improve the stability of the person standing on the upper face 102. Alternatively to the locations for heels, the surface of the upper face 102 can be made of a non-slip material.

Or the wedges 105, 106 mentioned above allow each to form an arch support. In order to best adapt to the different morphologies, the wedge (s) 105, 106 may each be of variable shape.

To achieve this, the wedge or wedges may each be an inflatable wedge, the adjustment of the inflation of the wedge can then make it possible to adjust the shape of the wedge to what one wishes to obtain. In other words, the wedge or wedges 105, 106 can each adopt at least two different shapes. By "two different shapes of the wedge" is meant here that between the two shapes the lines and surfaces defining these two shapes can have different dimensions or aspects.

We understand that any type of wedge 105, 106 can be used within the rocking device 100 as long as it allows in particular to ensure the inversion of the foot. For example, the wedge can be thermomolded at the foot of the lower limb whose retracted gastrocnemius and soleus muscles must be stretched, this allowing a better adaptation to the morphology of the person concerned.

Preferably, the tilting amplitude of the rocking device 100 between the equilibrium state and the tilting state, that is to say the reference angle aref, can be between 8 degrees and 25 degrees. This amplitude of tilting is particularly suitable for adequately stretching the gastrocnemius and soleus muscles of a lower limb for which its gastrocnemius and soleus muscles are retracted.

All that has been described in combination with the rocking device 100 can be applied to the postural study device 119, or to the postural study process, and vice versa.

The present invention has an industrial activity, in particular in the sense that the rocking device 100, and in particular the postural study device 119 can be manufactured. Furthermore, the rocking device 100, and in particular the postural study device, can be used in the medical field, in particular to aid in the diagnosis of the retraction of the gastrocnemius and soleus muscles of at least one lower limb or to help rehabilitation of the retracted gastrocnemius and soleus muscles. In other words, the invention also relates to the use of a rocking device 100 as described for the rehabilitation of the gastrocnemius and soleus muscles of at least one lower limb of the person when he is standing on the support plate 101 .

Claims (15)

1. Rocking device (100) comprising a support plate (101), the support plate (101) comprising an upper face (102) intended to support a person, characterized in that it comprises at least one wedge (105, 106 ) for foot, said shim (105, 106) being arranged on the upper face (102). 2. Rocking device (100) according to claim 1, characterized in that it is configured to present a tilting state in which: - the rocking device (100) is in tilting stop, - The upper face (102) of the carrier plate (101) is inclined relative to the horizontal at a reference angle of inclination (a _re f). 3. rocking device (100) according to any one of claims 1 to 2, characterized in that the wedge (105, 106) is shaped to cooperate with an arch of one of the feet of the person standing on the platform carrier (101) so as to position and maintain said foot in inversion. 4. Rocking device (100) according to any one of the preceding claims, characterized in that the wedge (105) comprises a surface (1051) for reversing the foot, the surface (1051) for reversing comprising a plane of symmetry dividing said inversion surface (1051) into two parts (1052, 1053) symmetrical with respect to this plane of symmetry, and in that each of the two parts (1052, 1053) of the surface (1051) of reversal is delimited by first, second and third curves (C1, C2, C3) such as: - the first curve (C1) is included in the plane of symmetry, the second curve (C2) is included in a first plane perpendicular to the plane of symmetry, and in particular parallel to a plane in which the upper face (102) of the carrier plate (101) is included, - The third curve (C3) is included in a second plane perpendicular to the plane of symmetry and perpendicular to the first plane. 5. Rocking device (100) according to any one of the preceding claims, characterized in that the support plate (101) is configured to pivot around a pivot axis (107) allowing the tilting of the device to be implemented. rocker (100). 6. Rocking device (100) according to the preceding claim, characterized in that the shim (105, 106) is arranged in line with the pivot axis (107) when the upper face (102) of the carrier plate ( 101) is horizontal. 7. rocking device (100) according to any one of the preceding claims, characterized in that it comprises at least one stop (112) projecting from a lower face (103) of the carrier plate (101), said stop (112) making it possible to limit the tilting amplitude of the rocking device (100), in particular by bringing the stop (112) into contact with the ground (104). 8. Rocking device (100) according to claim 2 and any one of the preceding claims, characterized in that it comprises: - a measuring member (127) configured to determine, during a passage of the rocking device (100) in its tilting state, the holding time of the rocking device (100) in said tilting state, - a device for generating (128) a signal, said signal being generated when the holding time reaches a predefined time threshold. 9. Rocking device (100) according to any one of the preceding claims, characterized in that the wedge (105, 106) is of variable shape. 10. Rocking device (100) according to any one of the preceding claims, characterized in that it comprises at least one baropodoscope (125). 11. Rocking device (100) according to any one of the preceding claims, characterized in that it comprises a counter (126) configured to generate at least one data item relating to the use of the rocking device (100). 12. Postural study device (119) of a person (120), characterized in that said postural study device (119) comprises: - a rocking device (100) according to any one of the preceding claims, - an electronic device (122, 123) configured to determine at least one value representative of an angle of inclination (a,) of a part (121) of a lower limb of the person (120) relative to the 'horizontal (H1) when the person (120) is standing on the carrier plate (101) and the lower limb has a foot cooperating with the wedge (105). 13. Postural study device (119) according to the preceding claim, characterized in that: - Said angle of inclination (a,) of the part (121) of the lower limb relative to the horizontal corresponds to an angle formed, between a horizontal plane and the part (121) of the lower limb, in a plane parallel to the sagittal plane of the person (120), - said part (121) of the lower limb is the fibula of this lower limb, - said rocking device (100) is configured to present a tilting state in which: o the rocking device (100) is in tilting stop, o the upper face (102) of the carrier plate (101) is inclined relative to the horizontal at a reference angle of inclination (Ctref), - the electronic device is configured to: o determine a first value representative of the angle of inclination (a,) of the part (121) of the lower limb relative to the horizontal when the upper face (102) of the support plate (101) is positioned at horizontal, o determine a second value representative of the angle of inclination (a,) of the part (121) of the lower limb relative to the horizontal when the upper face (102) of the support plate (101) is inclined according to the reference tilt angle (a _re f), o determine a posture indicator of the person taking into account the first and second values. 14. Postural study device (119) according to the preceding claim, 5 characterized in that the posture indicator corresponds to a variation between the first and second values, and in that the postural study device (119) comprises a memory for storing (129) values of the posture indicator determined during different uses of the rocking device (100). 10 15. Use of a rocking device (100) according to any one of claims 1 to 11 for the reeducation of the gastrocnemius and soleus muscles of at least one lower limb of the person when he is standing on the support plate ( 101).