DE102010046367A1 - System for analyzing motion of human body, has electronic system with associated software, which is mounted in human body in position to detect and store movement data - Google Patents

Abstract

The motion analysis system has a miniaturized power source unit, inertial sensor, data memory, microprocessor with associated software for fastening to the human body. An electronic system with software is mounted in the human body in a position to detect and store the movement data. A support is provided in the spinal orthesis (2) by which the electronic system is fixed in the central region of lumbar vertebrae of the user (1). An independent claim is included for method for enhancement and acceleration of rehabilitation measures.

Description

The present invention relates to an analysis system for movements of the human body. In particular pathological movements are detected and converted by an algorithm in the evaluation of the measured values into easily understandable figures. In addition, the invention relates to a method for improving and accelerating a rehabilitation process.

After injuries of the musculoskeletal system, after certain diseases or even after operations such. As the artificial replacement of a joint, it is particularly important for rehabilitation that as early as possible returns to normal motion picture. For example, after the artificial replacement of a hip joint, it is the goal of rehabilitation that the patient as soon as possible again an inconspicuous, d. H. From the average of the population considered normal, gait image achieved. So z. B. originally tolerance-related restraint or Schonbewegungen not become a habit, or already existing unnatural movement habits should be exercised as soon as possible after switching off the pain cause. It goes without saying that it is i. d. R. The aim of artificial joint replacement is to learn as quickly as possible again an inconspicuous movement pattern. A special feature of an inconspicuous gait pattern is the temporal and spatial symmetry of the step sequence. Other characteristics are u. a. unnatural or exaggerated movements of the body when walking in all 3 planes (cranio-caudal, medio-lateral and anterio-posterior).

For example, after the artificial replacement of a knee or a hip joint, those affected are usually rehabilitated and are either in a special rehabilitation clinic or outpatient care by physiotherapists on. After completion of the primary surgical wound healing, it is one of the goals of the rehabilitation measures to strengthen the entire affected musculoskeletal system and in particular to normalize the gait pattern. The same goal pursues z. As well as the rehabilitation after prosthetic restoration of an amputated leg, or even after the orthotic treatment of a limb.

It is with all the o. G. Measures important to judge the motion picture. Most often, this is currently done via the qualitative assessment of a suitably trained professional, z. A doctor or a physiotherapist. Various measuring methods are also known, with the aid of which the motion sequences of a subject can be recorded and quantitatively assessed. Mention may be here, for example, measuring plates, which can capture the pressure of a passing subjects temporally and spatially, camera systems with appropriate motion analysis software or combinations of the aforementioned. Systems are also known which detect motion sequences via interference sensors such as acceleration sensors and / or so-called gyroscopes (measurement of the angular velocity) and via magnetic field sensors. Furthermore, the use is known alone or in combination with the aforementioned systems of switching elements, such as contacts in the soles of the shoes, mechanical protractors, pedaling load cells and other constructions.

All previously known systems have many disadvantages. Systems with pressure measuring plates and cameras are very complicated and expensive and are only applicable in a special laboratory environment. To control the gait pattern, these systems are not very suitable for the reason that most subjects in the lab are no longer relaxed in front of observers and already changed the gait pattern for the reason. Also, the previously known devices with inertial sensors are only designed to perform short-term measurements in an environment observed, so have the above-mentioned disadvantages. Long-term measurements with detection of the influence of a certain physical fatigue or fatigue are not possible with the known system. Other disadvantages of the known methods are often a complicated wiring of the subject, which not only hinders the natural movement but also requires a lot of time. All known systems expect the subject to measure under observation in a controlled predetermined environment, which is certainly useful for scientific comparison purposes between subjects, for the objective assessment of the quality of movement and their change during the rehabilitation process is less suitable.

It is therefore an object of the invention to provide both a measuring system and an evaluation and rehabilitation method, by means of which the quantitative detection of the quality of movement is possible. The system according to the invention must not obstruct the subject in any way and is capable of autonomous movements over a long period of time, especially over a period of at least 24 hours, preferably at least 48 hours, more preferably at least 96 hours, in a completely uncontrolled environment, for example during a relaxed walk. It is a further object of the invention to specify a method by means of which parameters relevant to the quality of the movement can be filtered out of the measured values and calculated, with the aid of which the objective comparison the movements over a time course of a particular individual as well as a comparison to a "nomal" classified control group allows. It is a further object of the invention to recognize the fatigue or fatigue of a subject in order to warn the subject of possible disadvantages, which is due to an increasing physical weakness, early warning, or to consider such in the assessment of the quality of motion by third parties to be able to. In addition, it is the object of the invention to provide the subject or a third person with direct feedback about the quality of the movement or about the non-achievement of a predetermined goal. It is particularly advantageous if the device can self-learning set or change certain goals depending on the data determined from the past.

The objects of the invention are achieved by a device according to the preamble of claim 1. In further claims, particularly advantageous embodiments and methods of application are described.

The above-mentioned disadvantages of the prior art are overcome by the invention. It creates a system in which the required measuring device can be easily created and operated by a layman. The evaluation can be done either in real time by the device itself, or it is also possible that the device according to the invention only collects data which is later evaluated by a computer to be connected with appropriate software. It is also possible that the data is transmitted via a network, for example via the Internet to a central server, which not only serves as a central data store, but which can also make certain evaluations and beyond the remote access by the subject or even by a suitably authorized third party, such as the doctor or therapist. It is possible that the complexity of the evaluation is tailored to the particular user of the data. Thus, for example, the doctor can be presented with the data in a different form or according to a different evaluation algorithm than the therapist or the layperson. In the case of direct data evaluation, the user could by a direct feedback, such as optical, acoustic or tactile, z. B. via vibrators or even small current pulses, information about whether he changed his motion picture after the preset expectations positive or negative. In the subsequent data analysis, the stored data can be extensively evaluated, and so the expert can be provided meaningful evaluations, for example, the course of therapy, the general constitution or the compliance of the patient.

The quality of movement is evaluated using a special algorithm. The starting point is not only the "normal" values of the average population, but also the ability of the individual who has been determined by an initial measurement. This ensures that a subject is classified according to his or her abilities, and that time-course assessments take physical and psychological abilities into account. This avoids that a subject is thereby overwhelmed or misjudged, because he is not expected due to other factors to achieve characteristics of a comparison group, which does not have to cope with certain restrictions in addition. For example, it could be that a subject due to secondary disease or due to an old injury even with healthy, pain-free hip joints inconspicuously can not go limp, and therefore it also after surgery. For example, at the hip joint it will not be possible for the test person to achieve similar values in the future as an otherwise healthy comparison group. If it were not possible to provide the system according to the invention with an individual "handicap", the application would be questionable not only in the meaningfulness of many potential users, but possibly also counterproductive, since the user can never have a real sense of achievement and therefore unnecessarily frustrated becomes. The system according to the invention is also able to detect the state of fatigue or exhaustion of the subject. This is achieved by filtering out fatigue-specific components from the acquired movement data in the room. For this purpose, the energy consumption can also be used if this is calculated from the data according to known dosimetric methods. Another characteristic of fatigue or fatigue is striking changes in the timing of movement patterns, changes in pacing rate, or walking speed for no external reason. An external reason could be here z. B. going uphill, but z. B. via data an air pressure sensor can be detected. It is also possible, the system according to this invention, the data of other sensors, eg. As a sensor for determining the heart rate, the respiratory rate, the oxygen saturation of the blood (oximeter) and others to provide and include in the evaluation.

The invention consists of a sensor unit, an evaluation with power supply and appropriate software, a support system for attaching the above hardware to the user's body, a wired or wireless connectivity to a computer, if necessary, an optical, acoustic or tactile measurement result-dependent output to the user, possibly a display for outputting relevant information to the user and / or to a third person, a software for analyzing and processing the measured values. In addition, it can be provided: a software for managing multiple users and software for subsequent preparation and storage of the measured data. The invention also includes a method for carrying out and managing rehabilitation measures as well as a calculation and display method for simple yet meaningful presentation and interpretation of the measurement results.

The sensor unit according to this invention comprises at least one acceleration sensor each for measuring the absolute acceleration in each of the three directions of the Cartesian coordinate system. In addition, a time measuring device is provided and at least one gyroscope for detecting the angular velocity in at least one plane, at least one magnetic field sensor, temperature sensor and air pressure sensor can furthermore be provided. These sensors either alone or in combination with the other sensors provide further data on the motion sequence.

The transmitter controls the sensors and the measurement process and is at least capable of the data from a longer time series, especially over a period of at least 24 hours, preferably at least 48 hours, more preferably at least 96 hours, in the digital memory belonging to the evaluation permanently save.

As a carrying system is provided to secure the electronics together with a battery system for power supply as part of an orthosis at a suitable location of the user's body. The electronic components can be used as a removable unit in a designated for this purpose bag with the said orthosis. But it is also intended that o. G. To firmly integrate electronics into an orthosis or part of such an orthosis. As part of an orthosis, reference is made by way of example to a back support, as is often used in known back bandages or orthoses. Such approximately heart-shaped pads have a dimension of about 15 cm edge length and a thickness of about 1 cm-2 cm. Both the electronics and their power supply together have a much smaller size and can therefore be easily integrated into such a pad. In this case, the electronics, possibly together with the power supply cells, preferably modern lithium ion cells, housed in a separate housing and this in turn be inserted into a corresponding recess in the pad. The known pads mentioned above are often made of silicone with a low hardness in the range of Shore A 20 to Shore A 60. Since silicone is known to be a very good insulator, the electronics and the power supply can also be cast directly into the pad during manufacture , In a particularly preferred embodiment, the electronics is equipped with a data radio and with a device for inductive charging, consisting of induction antenna and charging control for inductive charging of the battery. In this form, the recording electronics can be completely poured into silicone and has no connection to the outside and is accordingly well protected especially against environmental influences such as water, sweat, u. ä. Additional reinforcing elements for mechanical stabilization of the electronic board and possibly the battery cells are required. The pad (s) is / are fixed in a known manner via a Velcro-Velcro connection or via push buttons on the orthosis. Metal push buttons have the additional advantage that they can be used in addition to the transmission of electrical energy or electrical signals, in addition to the purely mechanical holding function so additionally can also take over a contact function.

It is also possible to place different components of the electronic system according to the invention at separate locations of the orthosis and the connection of the individual components with each other, and possibly also via correspondingly provided connectors to the outside, for example, to an external computer via cables introduced or via textile conductors manufacture. Regardless of the chosen embodiment, which are mentioned here only by way of example and to which this application is in no way limited, so to speak, an intelligent orthosis can be created. Under orthosis are by definition support means for the human body or its joints to understand. Thus, it is advantageous, for example after hip joint replacement operations, to carry a compressive orthosis which stabilizes the hip joint for a certain time in which the electronics according to the invention can be integrated. Other, particularly suitable orthoses for integrating the sensor electronics according to this invention are back braces. But it is also possible to integrate the electronics of the invention in orthoses for other body parts, for example in knee orthoses. Furthermore, the use of electronics according to this invention in connection with prostheses, so by definition in body parts, possible, or the electronics could also be integrated into this. Depending on the intended use, the electronics with the sensor system are required only once per subject, namely when it comes, for example, to assessing the symmetry of the gait pattern. If necessary or is desired to detect the relative movement or the relative position of two body parts against each other, it is also provided according to this invention to use a plurality of identical or even several different sensor units on a subject at the same time. Of course, it is also possible to use the system according to this invention without the context of an orthosis or a prosthesis. In this case, it is only necessary to attach the electronics either to the user's clothing or to provide a corresponding carrying strap. The first is in a simple way z. Example, via a clip on the housing of the electronics possible, the latter can for example be easily achieved by a belt with appropriate pocket when the belt is attached to the candidate body part of the user.

To connect to a computer, a wired USB connection can be provided, via which the batteries of the electronics can be loaded. Additionally or alternatively, a wireless connection can conform to one of today's common standards. z. Bluetooth, Bluetooth Low Energy, Wi-Fi, NanoNet, 6LoWPan, ZigBee, Wireless HART, or similar, or for a different profile. B. UltraWideBand be executed.

In the case of using the system according to the invention for determining activity profiles, it is also provided to additionally use known localization sensors. An example of such a known sensor system would be the GPS Global Positioning System. With information from such a sensor, it is possible to detect not only the distances covered in the movement, but also to create a speed profile, in turn, valuable data on the level of activity of the user with the related data such as energy consumption and possibly fatigue of a preferred The movement analysis system evaluates a plurality of gait parameters and displays them separately or together for a better overview. From these different gait parameters the therapist can detect certain gait irregularities, gait asymmetries or other gait errors.

In a preferred embodiment, this classification of gait parameters to more or less pathological gait types automatically z. B. by expert system in a software. As gait parameters are used for example:
length of the step cycle
temporal regularity (ipsilateral)
temporal symmetry (contralateral)
Parameters 1, 2, 3, 4, 5, 6, 7, inter alia, of the cranio-caudal acceleration signal
Parameters 1, 2, 3, 4, 5, 6, 7 and others of the antero-posterior (= dorso-ventral) acceleration signal
Parameters 1, 2, 3, 4, 5, 6, 7, etc. of the medio-lateral acceleration signal
Parameters 1, 2, 3, 4, 5, 6, 7 and others of the rotational speed signal about the cranio-caudal axis
Parameters 1, 2, 3, 4, 5, 6, 7, inter alia, the rotational speed signal about the dorso-ventral axis
Parameters 1, 2, 3, 4, 5, 6, 7, etc. of the rotational speed signal about the medio-lateral axis

Parameter 1 denotes P1 or the average of several of the odd-numbered peaks (P1, P3, P5,...) Of the normalized autocorrelation of the signal over several steps. Parameter 1 is a measure of symmetry and regularity together. Parameter 2 denotes P2 or the average of several of the even-numbered peaks (P2, P4, P6,...) Of the normalized autocorrelation of the signal over several steps. Parameter 2 is a measure of regularity (ipsilateral only). Parameter 3 is formed as the ratio parameter 1 to parameter 2 and is a measure of the symmetry (only contralateral). Parameter 4 is the average maximum value of the signal per step over several steps, parameter 5 the maximum value of the signal over several steps, parameter 6 the average of the integrals of the signal per step over a certain portion of each step, parameter 7 the maximum of the integrals of Signals per step over a specific subset of each step. Other parameters z. B. integrals over other subareas as well as other analytical functions are possible. In autocorrelation, the even-numbered peaks compare with the same side of a double step (ipsilateral), the odd-numbered peaks compare with the other side (contralateral). A measure of the gait asymmetry is the ratio of the height of the first peak to the second peak, ie how much smaller the contralateral regularity is compared to the ipsilateral regularity of the step pattern ( Moe-Nilssen and Helbostad 2004, Estimation of gas cycle characteristics by trunk accelerometry. Journal of Biomechanics 37 (2004), 121-126 ). If the first peak is about the same as the second one, there is no asymptomy because the same amount of irregularity occurs even in steps of the same side. The temporal normalization of the steps carried out before the autocorrelation calculation is advantageous if the analysis can not be assumed to have a constant stepping rate, as usually occurs only under laboratory conditions. For measurements in everyday life, variable stepping speeds are the norm. The time standardization before the autocorrelation calculation serves to make the detection of gear asymmetry from measurement data with variable gear speed usable. This is made possible by first recognizing a characteristic detected in the steps, e.g. B. the footrest in the vertical acceleration signal, and the measured values are interpolated between the times of these characteristics, so that after this time normalization all steps have the same length. The time normalization of the steps before the application of the autocorrelation makes it possible to derive therefrom a parameter for the gait symmetry, which is independent of short-term variations in the stepping speed. A possible temporal asymmetry during walking is indeed lost in the normalized autocorrelation, but since the step times are known exactly, it can be used from these as a separate parameter. Since the peaks of the autocorrelation are known after the time normalization, only these need to be calculated and not the entire autocorrelation curve, so that there is a considerable saving in computation time and computing memory requirement.

In a particularly preferred embodiment, a single synthetic gait quality parameter is calculated from a plurality of gait parameters. This is used for the feedback to the patient, for example by presentation on a screen / display and / or by biofeedback, for example by means of vibration transmitter. In doing so, the synthetic gait quality parameter takes sufficient individual gait parameters into account so as to prevent the patient from improperly altering other gait parameters by compensating movements by improving a certain gait parameter by training. Such degradation of other parameters is recognized by the system and either output as a warning and / or included in the synthetic gait quality parameter such that it indicates no improvement. Thus, the synthetic gait quality parameter covers the parameter space of the gait pathologies as much as possible, so that, with its improvement, it is unlikely that the system will overlook any other pathology (eg, asymmetry, irregularity) that is entering. In order to prevent it from beginning value of the synthetic gait quality parameter, from which an improvement z. B. is to be achieved by training or biofeedback training is too bad and thus the parameter space for an improvement to many directions allows so very many different pathological gait pattern does not lead to a deterioration indicator a learning procedure is used. A number of steps are taken under the supervision of a physician, therapist or a person familiar with Gait Pathologies. The number of steps should be at least 15, preferably at least 25, preferably at least 40 steps. These recordings of reference steps can be repeated several times, possibly under the guidance of the physician, therapist or other person familiar with Gait Pathologies to improve the gait pattern until the reference recording reflects the best for the patient currently achievable gait. This allows the system to be sensitive to degradation of gait parameters.

In addition to providing many different gait parameters, it is a particular object of the invention to provide simple characteristics of the gait parameters.

As already mentioned above, it is also possible that the portable electronics are able to calculate certain gait parameters directly and in real time and to convert these via mathematical algorithms into individually adapted characteristic values. Depending on the characteristic values, direct information can be transmitted to the user via a biofeedback process. It has proven particularly useful to use vibrators for such a feedback system. The information to be transmitted can be pulse coded, position coded, and transmitted coded over time and / or intensity to the user. So it is z. B. in the case of the analysis of the walking step movements, the user at intervals, for example every 5 minutes, to give about vibration impulses information about what percentage of all usable steps when walking a preset quality of the gait is achieved. If, for example, at most 30% of the steps correspond to the specifications, a single vibration pulse is given once during the abovementioned period of time. If the quality to be achieved is reached in more than 30% and less than 60% of the steps, the impulse consists of 2 short consecutive single pulses. If the quality in more than 60% of the steps is at least equal to or better than the specified characteristic value, three short-term successive vibration impulses are given. Of course, the invention is not limited to the possibility of coding as exemplified here or to the type of information transmission by vibrators. Of course, other types, such. As the sounding of acoustic signals or the playing of sound sequences within the meaning of the invention conceivable.

The electronic measurement data acquisition described in this invention is universally applicable and is not limited to the applications exemplified in these embodiments. In the case of gait quality studies, however, it is necessary for the system to be able to recognize coherent, meaningful sequences of steps and to be aware of other movements, eg. As the trampling in a mainly standing performed craft work to distinguish. This is inventively achieved in that the sensors, for example via the Air pressure, or its changes, the walking in the plane determines. Modern pressure sensors can already detect geodetic height differences of one meter here. In addition, an algorithm is provided in the software of the sensor electronics, which can filter out from data of regularity over a certain period of time or from data of the number of regularly successive steps meaningful successive sequences of steps, which are then used exclusively for the calculations of the indices mentioned above , For this purpose, z. B. also considered the uniformity of the step sequence (uniform cadence). Experience has shown that a cadence is considered to be uniform if the variations in the temporal sequence are less than 5%, better still less than 2%. Furthermore, z. B. provided, the first at least two, better at least four, or depending on the number of total determined regular steps, possibly even more steps not included in the calculation. The final steps of a recognized regular step sequence are likewise ignored in the calculation.

The invention will be described in more detail below using the example of the use together with a back orthosis and together with a hip orthosis with reference to illustrations. It is expressly emphasized that in the examples shown, these are merely preferred applications. Of course, the invention can also be applied to other applications. Examples of other applications would be z. As the gait analysis in the manufacture and adjustment of leg prostheses, or for gait training after leg prosthesis supply. The use of the erfindungsgmäßen sensors with associated electronics for the determination of impermissible movements or immobility would be further examples of embodiments in the context of this invention.

It should be expressly mentioned that the system according to this invention is not gender-specific applied differently. In the text was usually for reasons of simplification, usually only the masculine form of the name, ie z. As user, doctor, therapist ... used. Of course, everything said applies equally to the feminine synonyms.

Show it:

1 : a section of the human body seen from the dorsal, ie from behind with applied back orthosis and indicated heart-shaped pad.

2 : the skin-facing side of the pad off 1 with proprioceptive pimples

3 : take a look inside the pad 2

4 : a section of the human body viewed from the dorsal, ie from behind with applied hip orthosis and indicated positioning of the electronics according to the invention.

5 , an example of the symmetry space mentioned in claim 17 as a graphical output of symmetry quality in regular walking.

1 shows a user 1 symbolically represented as a torso from behind (dorsally) with a back brace 2 and the associated heart-shaped pad 3 which is between the body of the wearer 1 and the orthosis 2 placed and a not shown Velcro in the orthosis 2 is attached. The pad is in realitas of the dorsal part of the orthosis 2 hidden and is therefore shown in dashed lines.

2 shows the body-facing side of the pad 3 out 1 , In the example shown, the pad is made of soft silicone material, the pad is about 15 mm thick and has knobs 4 about 5 mm from the plane base ( 5 ) protrude and thus thicken the pad overall.

The pad 3 is in 3 cut open, so to speak, halved in the drawing plane. In the illustrated embodiment, the inventive, symbolically represented, sensor electronics 6 along with two via one cable each 7 with the power supply cells 8th connected. In addition, the electronics unit points 6 another cable 9 which ends in a socket or a plug. The Electronic 6 as well as the connecting lines 7 and the battery cells 8th are with a reinforcement plate 11 used to glue. The cable 9 is with a strain relief 12 also with the reinforcement plate 11 connected and the components are completely molded into the silicone material of the pad. Only the cable 9 juts out from the pad below 3 out, leaving the plug or socket 10 , preferably a standard USB component, are accessible and via this a cable connection to an external, not shown computer can be made.

In 4 The present invention is in connection with a hip orthosis 13 , which seen from the dorsal on a symbolically sketched carrier 14 is shown. The Electronic 15 consists here of a unit with power supply and external terminals in a housing, not shown, and is dorsal near the center of gravity in the lumbar region with the hip orthosis 13 connected.

The dorsal positioning of the sensor electronics in the vicinity of the body center of gravity in the lumbar region has proven particularly useful, since in this way reliable statements about many parameters of the human gait with only one sensor electronics unit is possible.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• Moe-Nilssen and Helbostad 2004, Estimation of gas cycle characteristics by trunk accelerometry. Journal of Biomechanics 37 (2004), 121-126 [0018]

Claims (21)

Motion analysis system consisting of a miniaturized unit of power supply, Intertialsensorik, data storage, microprocessor with associated software for attachment to the human body, characterized in that the electronics is worn together with the software on the human body and is able to capture motion data and store. Motion analysis system according to claim 1, characterized in that the entire hardware is integrated into an orthosis and the orthosis is in addition to your support function and the attachment function of the electronic unit. Motion analysis system according to claim 1, characterized in that the orthosis is a hip orthosis. Bewegungsungsanalyssystem according to claim 1, characterized in that the orthosis is a back orthosis. Motion analysis system according to claim 4, characterized in that in the back orthosis a holder is provided, through which the electronics can be fixed centrally in the lumbar vertebrae of the user. Motion analysis system according to one or more of the preceding claims, characterized in that an algorithm for detecting a meaningful, regular step sequence in the plane is provided for further analysis of the gait image. Bewegungsungsanalsesystem according to claim 1, characterized in that in addition further sensors, such as magnetic field, temperature-humidity and air pressure sensors and others are provided. Motion analysis system for measuring the quality of the human gait pattern according to one or more of the preceding claims, characterized in that the sensor is attached dorsally in the lumbar region of the human body. Motion analysis system according to one or more of the preceding claims, characterized in that a statement about the gait is made by measuring the spatial and temporal symmetry of the step sequence of the right and left leg. Motion analysis system according to claim 9, characterized in that in addition to the symmetry further parameters such as cranio-caudal, medial-lateral and anterio-posterior movement patterns are detected and taken into account in the algorithm for analyzing the measurement data to assess the quality of the movement. Movement analysis according to claim 10, characterized in that at least two parameters of the cranio-caudal, medial-lateral and anterio-posterior movement pattern are taken into account in a quality parameter such that upon improvement of one parameter and deterioration of another parameter an output takes place, which takes into account the deterioration. Motion analysis system according to one or more of the preceding claims, characterized in that the measuring unit has a certain intelligence which can filter and compress the data. Motion analysis system according to one or more of the preceding claims, characterized in that the electronics is capable of autonomously collecting and storing the necessary data according to the invention independently over a period of at least 24 hours. Motion analysis system according to one or more of the preceding claims, characterized in that the electronics can assess the quality of the movement according to predetermined criteria in real time, and can give the user a corresponding direct optical, acoustic or tactile feedback. Motion analysis system according to claim 14, characterized in that the system sets self-learning different levels of expectation (levels) to the quality of movement and thereby animates the user playful so to training. Method for improving and accelerating the rehabilitation of musculoskeletal disorders, characterized in that an inertial sensor-based measuring device can be applied and attached to the human body, which is able to assess the quality of movement quantitatively. Motion analysis system according to one or more of the preceding claims, characterized in that for the output of the analysis data a symmetry space is generated optically symbolic, which is generated by mirrored comparison and / or superimposition of the average determined values for the steps of the right and left side of the body. A method according to claim 16, characterized in that the measuring device a Statement about the time course of the motion quality provides. A method according to claim 16 and 18 characterized in that the measurement results in the planning of further rehabilitation measures directly taken into account. Method according to one or more of claims 16-19, characterized in that the user can observe himself quantitatively with the method and can comply with corresponding behavioral recommendations in the domestic field. Method according to one of the preceding claims, characterized in that a quantitative documentation of the success of the medical measures is carried out.

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