DE102009017532A1 - Prosthesis body for a thigh prosthesis - Google Patents

Abstract

The invention relates to a prosthesis body for a femoral prosthesis, comprising a shaft (5, 5a, 5b) with a proximal support plate (4) for a prosthesis head (15), wherein on the support plate (4) from this depending a medial (5a) and a lateral stem posts (5b) are arranged which are proximally spaced and distally tapered and which are connected by struts (6), in particular oblique struts (6), wherein between the two shaft posts (5a, 5b) and the struts (7) recesses ( 12) and / or freely continuous regions (12) are formed, can grow into the cancellous bone, wherein the medial shaft post (5a) is formed shorter than the lateral shaft post (5b). The invention further relates to a rasp instrument for a prosthesis body according to one of the preceding claims, having a surface which has rasp projections and which is identical to the surface of the prosthesis body, in particular to its shaft portion, in which the surface of the prosthesis body is greater than that of the rasp instrument , in particular such that the cross section of the prosthesis body at each point 0.5 to 4 mm, preferably 1 to 3 mm, particularly preferably 2 mm larger.

Description

The The invention relates to a prosthesis body for a femoral prosthesis comprising a shaft with a proximal support plate for a Prosthesis head, wherein on the support plate of this hanging down medial and lateral lateral posts are arranged proximal spaced and distally converging and through Bracing, in particular oblique struts connected between the two shaft posts and the Braces recesses and / or freely continuous areas are formed, can grow into the cancellous bone.

The The invention further relates to a rasp instrument for a such prosthesis body with a surface, the rasp projections and that to the surface of the prosthetic body is the same. Such rasp instruments are used to after resection in the proximal region of a femur (Femur) in the spongy part of the bone, which is surrounded by the cortical bone, a recess by rasping the cancellous bone to the prosthetic body in this Recess to place.

The prosthesis body of the type mentioned are known in the art and form in the described embodiment a prosthetic body, that grows into the bones, d. H. in which the cancellous bone after a Ausheilzeit the recesses and / or freely integrated Completely filling areas between the shaft posts and the braces, so that such a prosthesis body firmly anchored in the bone, without it being a cementation requirement.

The Refer to directional information used in this specification here on the position of the prosthesis body after insertion into the femur in an upright person.

at a prosthesis body described here, it may also be provided in addition be that the shaft posts additionally spaced along its longitudinal extent Have anchoring collars, in particular annular anchoring collars. Such anchoring bundles can be formed as radial thickening, which serve the surface magnification, which can also be achieved by other geometric shapes. For example, you can the anchoring collars also be designed as grooves. In addition to the shaft post can also the possibly provided bracing such anchoring bundles to have.

Prosthesis body of this Art usually become from a titanium alloy or from chromium-cobalt-molybdenum alloys or other suitable materials and may be beyond For a better connection with the bone mass a microporous roughened Have surface the z. B. generated by jetting with glass beads / particles or by etching can be.

By the described construction, in which the shaft posts in the upper Area in which they are connected to the support plate, in the lateral direction - ie in the direction from lateral to medial - are spaced and after running towards each other at the bottom, the posts being curved, in particular curved in 2 dimensions Can take course, a shape design is achieved, the inner free area of the proximal end of a femur after rasping the cancellous Bone structure corresponds. This is how such a prosthesis fits optimally to the inside of the bone. For example, the shafts each convexly curved medially and / or ventrally in the prior art It is known in this type of prosthesis that the support plate all over the shaft, or the cross section of the shaft protrudes, the immediately below the connection area between the support plate and shaft post is given. Thus, a known support plate previous prosthesis body across from the shaft of such a prosthesis body an all-round collar on. In such a collar so far the benefits have been recognized that this is all around on the cortical bone of the femoral shaft support can.

In the meantime, was found out due to insufficient knowledge about the physiological Characteristics of power transmission in Femur bone the support plate of the prior art known prosthesis body too big has been. Often, such a prosthesis body had to be inserted laterally into the cancellous bone volume with an osteotomy of the greater trochanter. This then had to the prosthetic body be fixed by means of a wire loop, resulting in stabilization the tensile forces Musculature served.

In Meanwhile, it has been found that such a proximal Resection of the proximal femur is not mandatory.

Furthermore such known prosthesis body have a large volume, so that too much cancellous bone is removed for implantation must become. It's about it In addition, the known prosthesis body only a very small elasticity and therefore according to force of the bone to show low compliance.

task The invention is therefore a prosthesis body of the aforementioned Kind, as well as one for it to provide usable rasp instrument, with which on the one hand with less material used in the prosthesis body and on the other with lower Intervened on the thigh bone a tight and all loads everyday prosthesis can be achieved.

The Task is solved by that with a prosthesis body the aforementioned generic type of medial shaft posts shorter is as the lateral shaft post. Due to the longer trained lateral The shaft post will be sufficient good support of the prosthetic body produced laterally on the inside of the femur, but the one about the distal end of the shorter medial Shank post protruding distal part of the medial shaft post a higher one Elasticity against force stresses has in comparison to the known in the art constructions. The rapid shaft rejuvenation down from the distal end of the medial shaft post contributes to one resilient compliance of the lower shaft end at.

Furthermore has a prosthesis body according to the invention reduced volume compared to the prior art, so even a minor resection of the femur is sufficient.

In In a preferred embodiment it can be provided that at the distal An oblique strut is arranged at the end of the medial shaft post. which extends distally and on the lateral shaft post. To the shaft post extension can such a skew brace For example, have an angle of substantially 45 degrees. oblique struts with each other have an angle of substantially 90 degrees, in particular wherein the respective shaft-proximal ends of the oblique struts adjoin one another.

When a preferred embodiment can be an aspect ratio of lateral shaft post to medial shaft post at least substantially 3: 2 be. In concrete execution can in this or other proportions of the lateral lateral post a length below the support plate of 60 mm to 75 mm, preferably 65 mm 70 mm, more preferably 67.4 mm.

It may further provided according to the invention be that at least one of the two shaft posts, preferably both is designed as a double post of two double post parts, with the two double-post parts facing ventrally / dorsally, especially in alignment.

A Such double post construction can be z. B. thereby, a shaft post along its extension, in particular medial or lateral has a material recess and thus then two connected parallel double post parts can be understood. The shaft posts preferably correspond to their course according to the anatomy of the bone and enlarge the Surface of the Prosthesis shaft with minimal use of metal volume.

The inventive construction a denture body with shortened medial shaft post can in conjunction with other in the state of Technically known support plates are used. These known Support plates can for example, one on all sides the collar protruding collar have, wherein the underside of the support plate implanted in the Condition can be tilted out of the horizontal.

In a preferred embodiment it can be against it be provided that the support plate medially over the Shaft immediately below the connection area or whose cross section survives and the support plate ventral and dorsal passes without supernatant into the shaft. In this version can preferably at least the lower connection region of the support plate, to which the shaft posts are attached, be arranged horizontally. The aforementioned embodiment However, the support plate may also be provided when the lower connection area the support plate deviates from the horizontal orientation.

One Such further developed prosthesis body is thus essentially supported only medially over the projecting portion of the support plate on the Corticalisknochen of the femur, viz especially at the point where the corticalis area especially strong and solid, and with its greatly enlarged surface Spongiosa leaves remaining in the cancellous bone.

By contrast, ventrally and dorsally, preferably also laterally, the support plate in this development, no or no significant protrusion relative to the cross section of the shaft immediately below the connection region, so that the support plate with its ventral and dorsal side regions arranged substantially only medially in the femur is, ie not rests on the Corticalisknochen in these areas, as was the case in the prior art embodiments so far. Thus, in the case of a prosthesis body according to the invention, an approximately 4-6 ml larger resection can be performed, which does not adversely affect the ingrowth of the prosthesis body, but a smaller support plate is sufficient as it resectes distally is, and thus material can be saved on the prosthesis body.

In one more about it Beyond training, it may also be provided that the support plate on all sides, d. H. medial, lateral, ventral and dorsal without supernatant goes into the shaft area.

at said training according to the invention, according to the Support plate ventral and dorsal, if necessary also medial and preferably also lateral without supernatant goes into the shaft, is not under the feature that no supernatant exists only a mathematically exact alignment between shaft and support plate understood, but also small supernatants, which are so small, that no collar is formed, with the essential support, in particular takes place on the cortical bone of the femur.

Under Support plates without overhang are therefore understood to be those with their ventral and dorsal arranged side surfaces, if necessary also medial and lateral side surfaces arranged medial in the femur are. It can supernatants for Shank in the range of 0-10%, preferably 0-5% based on the thickness of the shaft between the ventral and dorsal, or given medial and lateral side surfaces of the support plate be. Support plates with such small projections are used as support plates understood that according to the invention without supernatant are formed compared to those support plates as they are are known in the art.

Otherwise can be a prosthetic body in usual Way, as is the case with the prosthesis bodies of this generic type is known to be implanted in the femur, with the metal-free Volume of prosthetic stem either with auto or artificial Spongiosa graft replenished shall be.

In A particularly preferred development may be provided that the prosthetic body laterally in the region of the support plate, or the support plate itself laterally so ends that the prosthesis body or the support plate after an insertion into the femur at least predominantly without resort to Corticalisknochen of the greater trochanter.

So It is known from the prior art that prosthesis body of the aforementioned type laterally on the support plate laterally and after having above-oriented projection in particular of a curved type, with which is the known prosthesis body supported on the corticalis of the greater trochanter.

It was found by extensive research that a Such Trochanterstütze on the support plate can be omitted, without affecting the stability of a In the bones ingrown prosthesis body adversely affected. Thus, in a prosthesis body according to the invention with respect to a In the prior art known prosthetic body account for such Trochanterstütze.

For example can do this the prosthesis body at the height the support plate or the support plate itself laterally to the shaft fall off. Tragplatten with a Trochanterstütze contrast ended laterally in height Raising, with this rising area against the cortical bone of the Trochanter supported to be able to. Thus, in the embodiment according to the invention, a shape results the prosthesis body, which is less bulky at the top and therefore easier is implantable.

As well it can be provided here, the dimensions of a prosthetic body the height to carry out the support plate in such a way that the prosthetic body or the support plate itself parallel to the longitudinal axis of a prosthesis head or its neck, which is arranged on the support plate, in one Distance from 20 to 30 mm, preferably 22 to 26 mm and particularly preferred of 24 mm ends. These small distances will ensure that lateral to the prosthesis body no element or area is arranged, which is supporting against the trochanter major or its cortical bone after insertion a prosthesis body according to the invention applies.

at the prosthesis bodies according to the invention described here can it may be provided that a prosthesis head is fixed to the support plate is arranged. This prosthesis head has a neck area, which merges into the upper region of the support plate, wherein on the prosthesis head a joint ball is attached or can be fastened.

In an alternative and particularly preferred embodiment It may be provided that a prosthetic head with his neck area can be fastened to a support plate. On a prosthesis body according to the invention can thus subsequently, for example also attached to a prosthesis head only after an insertion of the prosthesis body in the femur become.

According to the invention, it may further be provided that a prosthesis head can be fastened in different angular positions on a support plate, for example in at least two angular positions. This may preferably be discrete angular positions, ie a prosthesis head can be in one or the other angular position be fixed, but not in intermediate positions.

For example It may be provided here that the neck area or a arranged projection or fastening part in a fastening counterpart, z. B. a recess, in particular one of at least two recesses the support plate can be inserted. Such recesses, for example two recesses, can overlap at least in their upper areas.

For example can such recesses may each be formed as a bore, wherein the holes starting from a common opening in the support plate below the support plate in two or depending on the number the holes also extend more different directions. One Prosthesis head, which is inserted with its neck area through such a common opening Thus, depending on the direction of insertion in one of the provided Holes are used and thus different angles in the same Take the support plate.

Prefers It is provided here, in a support plate of the aforementioned according to the invention which is preferably oriented horizontally after an insertion and in particular perpendicular to the axis of the longitudinal extent of the shaft is arranged, the neck of the prosthetic head at an angle of 58 degrees to the prosthesis support plate to arrange, d. H. in the so-called Valgus. This will overload bone and implant especially on Adam's bow avoided. In another execution it may also be provided, the prosthetic neck neck at an angle of 30 or even 38 degrees to arrange the support plate, as the case may be which situation is found on the patient.

It is therefore particularly preferred that when fastened prosthetic heads achieved depending on the insertion of one of these aforementioned angle becomes. It is inventively provided that the aforementioned angle not only fastened to the support plate prosthetic heads is achieved, but also with prosthetic heads, which already at the production are connected to a support plate. It can therefore essentially be provided to provide two or more different prosthesis body, one with an angle of 58 degrees and one with an angle of 30 or 38 degrees between the neck of the prosthesis and the support plate. Of course they are here further other angles possible, if they prove suitable.

In a further preferred embodiment, alone or in conjunction with the aforementioned embodiments can be used, it can be provided that the prosthesis body at least a connecting element, in particular in each case a connecting element in a proximal and a distal region, which For example, can be designed as a threaded hole and with the prosthesis body is connectable with a vibrating device. For example, can Such a connecting element, in particular a said threaded bore in the support plate and / or at the lower end of the shaft (olive) ventral and / or dorsally arranged. In the embodiment according to the invention with shortened medial shaft post may be preferred such a threaded hole at the distal end of the lateral shaft post or in a lower region be arranged between the medial and lateral shaft posts.

By the coupling of a vibration device to such a connection element, especially at two points of the prosthesis body, a prosthesis, which has grown into a bone, subsequently retrieved from the bone removed by the application of oscillations to the prosthesis become. So can by means of a vibration device, for example via rods, the screwed into the threaded holes in the dorsal and proximal area Vibrations are introduced into the prosthesis body, whereby controls a fragmentation of cancellous bone around the prosthesis body or its shaft around can be achieved. There is a possibility after a relaxation of the prosthetic body in cancellous bone, extract it from the femur, for example, with a single targeted hit.

Around make the threaded holes in the prosthesis body accessible, in particular a dorsally arranged threaded hole at the lower end of the shaft, is it provided, accesses through the bone, then a vibratory device connect to be able to.

In a further preferred embodiment it may be provided that the neck of a prosthetic head is relative to the ventral end surface the support plate at an angle of 4-5 degrees, especially in one Angle of 4.4 degrees is arranged. Here, too, arise physiological Advantages of such a prosthesis according to the invention.

In a further embodiment according to the invention, it can also be provided to insert into the prosthesis body a chip which can be read out without contact from the outside. In such a chip, it may be z. B. act to an RFID chip. This has the advantage that on the one hand the prosthesis body used can be identified, for. By a stored serial number and that on the other hand also z. B. can be stored relative to a fixed position of origin in the chip, a coordinate that is read from the outside and indicating where relative to the original position, a connecting element is arranged to secure a vibrating device to the prosthesis body can. Thus, by reading this coordinate information, an operator can identify the location in which z. B. a bore must be introduced into the bone, which ends at a connecting element, in particular a threaded bore, to then attach a vibration-conducting rod of the vibrating device here.

One according to the invention called rasp instrument for a prosthetic body the aforementioned type according to the invention, which on its surface Raspelvorsprünge to rasp the cancellous bone in the proximal end of a femur, is characterized by the fact that it matches the shape of its surface is to the surface of the prosthesis body, in particular its shaft part, at least to the surface of a imaginary sheath of the prosthesis body, thought to be wrapped around the shaft posts. Here it is in the embodiment of the invention a rasp of this type provided that the surface of the prosthesis body is larger than that of the rasp instrument, in particular such that the cross section of the prosthetic body at each point 0,5-4 mm, preferably 1-3 mm and more preferably 2 mm larger. This can be during Insertion of the prosthesis stem into the cancellous bone volume, which produced with the smaller rasp instrument, a sufficient Press fit to be generated between prosthesis shaft and the inner Wall areas of the cortical bone and the rest of the songiosa bone, allowing a shape and sitting stability until complete healing the cancellous bone in the implanted prosthesis body results.

embodiments The invention is illustrated in the figures described below. It demonstrate:

1 : the plan view of a prosthesis body according to the invention

2 : a view from the medial to a prosthesis body according to the invention;

3 a lateral view of a prosthesis body according to the invention;

4 : A view of a prosthesis body according to the invention, in which the support plate is also formed medial without supernatant.

In the 1 a prosthesis body of the type according to the invention is shown, which can be inserted into the upper proximal part of a femur.

It can be seen here that the prosthesis body is a support plate 4 has, starting from the bottom down exactly two shaft posts 5a and 5b Hang down at the lower connection area of the support plate 4 are firmly connected with this. There is therefore exactly one medial shaft post in this embodiment 5a and a lateral one 5b , For example, the upper part of the prosthesis body with the support plate 4 and the lower one with the shaft posts 5a and 5b common in a casting process. Unless the shaft posts 5a . 5b are designed as double posts, the rear double post parts are not visible in this view.

It is further evident here that between the shaft posts 5a and 5b oblique bracing 6 extend to the shaft posts 5a and 5b to connect with each other and the entire shaft 5 to stabilize. This results between the shaft posts 5a and 5b as well as the bracing 6 Recesses and open passage areas 12 into which spongiosa can grow after the insertion of such a prosthesis body. Preferably, the metal volume of the prosthesis stem should not exceed the cancellous bone volume in which the prosthesis stem is seated by more than 9-12%.

Here it can be further seen that in the inventive embodiment of this prosthesis body, the support plate 4 only a medial supernatant or collar area 7 which is above the medial shaft post 5a or the cross section of the proximal end of the shaft directly below the support plate 4 survives, in particular so that this supernumerary area 7 with its lower surface 4b on the cortical bone of the femur hangs up, which is particularly stable at this point.

Furthermore, the ventral side surface has 8th the support plate 4 as well as the not visible here dorsal side surface of the support plate 4 no or at least only in the sense of the invention unimportant supernatant with respect to the shaft directly below the support plate 4 , This shows especially the 2 respectively. 3 , This results in that the support plate 4 In the anterior and dorsal region, it does not rest on the cortical bone of the femur, but is placed medially in the femur during implantation.

It also continues to show that the lateral end 4a the support plate 4 does not form an upwardly rising region as known in the art, but the support plate 4 here essentially in extension of the underlying shaft 5 ends. Here is the support plate egg to the shaft 5 have sloping down area. In particular, however, it is provided in any case according to the invention that the lateral end 4a The support plate or the prosthesis body ends in its lateral region in such a way that, after the insertion, it is at least substantially free of attachments to the trochanter major, ie it is not substantially supported there at least.

In the embodiment of the prosthesis body according to the invention shown here, it can be seen that on the support plate 4 firmly a prosthesis head 15 is attached, whose longitudinal axis 11 to the horizontal H, in which at least the underside of the support plate 4 is arranged, occupies an angle of 58 degrees. Likewise, an angle of 30 or 38 degrees would be preferred here.

On the prosthetic head 15 Here, in a known manner, a joint ball can be fastened, which corresponds to a joint socket in the hip bone.

The embodiment shown here shows a further preferred development, which may be provided, but need not necessarily be provided and which consists in that both at the distal end 9 of the post 5b 5 as well as at its proximal end and especially in the ventral side surface 8th the support plate 4 a threaded hole 10 is arranged. In such a threaded hole 10 For example, after providing appropriate access through the bone, a rod can be screwed in by means of which vibrations from a vibratory device can be introduced into the prosthesis body to cause it to vibrate within the spongiosa bone as well and thereby cause cancellous bone to be sheathed 5 smash around so that after a healing of such a prosthesis body this can also be removed from the femur later.

The inventive embodiment shown here further shows that the lateral end of the support plate 4 in the area 4a a distance parallel to the longitudinal axis 11 of the prosthetic head 15 which is preferably selected here to be A = 20-30 mm, more preferably 22-26 mm and particularly preferably 24 mm. This also ensures that after the insertion of the prosthesis body substantially no investment of the prosthesis body or its support plate 4 to the greater trochanter.

The dimension B between the distal end of the lateral shaft post 5b and the underside of the support plate 4 can be chosen here preferably to B = 67.4 mm. Likewise, other lengths are possible. Essential to the invention here is that the aspect ratio of shaft post 5b to shaft posts 5a is about 3: 2, so thus the lateral shaft post over the medial protrudes by about a third and forms an elastic lower end region. Here is the last lower stiffening between the two posts 5a and 5b by a diagonal strut 6 starting from the distal end of the medial pole 5a obliquely down on the lateral post 5b to extend, so that the shaft of the prosthesis body in total from about 2/3 of its length below the support plate 4 greatly rejuvenated.

The 2 shows in medial view a prosthesis body according to the invention, wherein it can be seen here that the support plate 4 only in their medial area 4a , which faces the hip bone, a projection against the shaft and in particular the medial shaft post 5a has, so that the bottom 4b this medial collar 4a on the cortical bone of the thigh can hang up. The view from lateral shows that the ventral and dorsal side surfaces 4c not or only insignificantly in a range of less than 10% relative to the shaft 5 directly below the support plate 4 survive.

Recognizable is in the representation chosen here as well, that the shaft post 5a as a double post from the two ventral / dorsally spaced double post parts 5a1 and 5a2 consists. The training as a double post can be understood that the post 5a has a medial groove N along the longitudinal extent of the post 5a runs from top to bottom.

The 2 show here as well as already the 1 in that in the axial extension of the shaft post 5a and 5b in the respective distance to each other thickenings, so-called anchoring bundles 14 are provided, which also serve to increased stability after ingrowth in the femur. The most important function of these anchoring collars is the surface enlargement.

The 3 shows the same prosthesis body in lateral view. Otherwise, the same statements apply here as for 2 ,

4 shows in addition a prosthesis body, in which, in deviation from the 1 the support plate 4 also has no supernatant medial, therefore, the in 1 as a collar 7 designated part deleted. Otherwise, the same statements apply as to the other figures.

With regard to all embodiments, it should be noted that the technical features mentioned in connection with an embodiment can not only be used or are used in the specific embodiment, but also in the respective other embodiments. All revealed technical features of this invention description are to be classified as essential to the invention and arbitrarily combined with each other or used alone. It is understood throughout the disclosure with the mention that a feature may be provided or a process step can be performed also an embodiment of the invention in which the feature in question is provided or a respective process step is performed.

Claims (18)

Prosthesis body for a femoral prosthesis comprising a shaft ( 5 . 5a . 5b ) with a proximal support plate ( 4 ) for a prosthesis head ( 15 ), wherein on the support plate ( 4 ) from this hanging a medial ( 5a ) and a lateral shaft post ( 5b ), which are proximally spaced and distally converging and by struts ( 6 ), in particular oblique struts ( 6 ), between the two shaft posts ( 5a . 5b ) and the struts ( 7 ) Recesses ( 12 ) and / or freely interspersed areas ( 12 ), into which cancellous bone can grow, characterized in that the medial shaft post ( 5a ) is shorter than the lateral shaft post ( 5b ). Prosthesis body according to claim 1, characterized in that at the distal end of the medial shaft post ( 5a ) a diagonal strut ( 6 ) located distally and on the lateral shaft posts (FIG. 5b ) to extend. Prosthesis body according to one of the preceding claims, characterized in that the aspect ratio of lateral shaft post ( 5b ) to medial shaft post ( 5a ) is at least substantially 3: 2. Prosthesis body according to one of the preceding claims, characterized in that the lateral shaft post ( 5b ) a length below the support plate ( 4 ) of 60 mm to 75 mm, preferably 65 mm to 70 mm, particularly preferably 67.4 mm. Prosthesis body according to one of the preceding claims, characterized in that at least one of the two posts ( 5a . 5b ) is formed as a double post of two double post parts, wherein the two double post parts are ventral / dorsal opposite, in particular in alignment. Prosthesis body according to one of the preceding claims, characterized in that a. the support plate ( 4 ) medial over the given immediately below the connection area cross-section of the shaft ( 5 . 5a . 5b ) and b. the support plate ( 4 ) ventrally and dorsally without protrusion into the shaft ( 5 . 5a . 5b ) passes, in particular wherein at least the lower connection region of the support plate ( 4 ), on which the shaft posts ( 5a . 5b ) are mounted horizontally. Prosthesis body according to one of the preceding claims, characterized in that a. the support plate ( 4 ) at least medially, ventrally and dorsally, in particular also laterally without protrusion into the shaft ( 5 . 5a . 5b ) passes, in particular wherein at least the lower connection region of the support plate ( 4 ), on which the shaft posts ( 5a . 5b ) are mounted horizontally. Prosthesis body according to one of the preceding claims, characterized in that the prosthesis body laterally in the region of the support plate ( 4 ), in particular the support plate ( 4 ) ends so that he / she after insertion into the femur ( 1 ) at least predominantly plant-free to the corticalis of the greater trochanter ( 3 ). Prosthesis body according to one of the preceding claims, characterized in that the prosthesis body at the height of the support plate ( 4 ), in particular the support plate ( 4 ) laterally sloping towards the shaft. Prosthesis body according to one of the preceding claims, characterized in that the prosthesis body at the height of the support plate ( 4 ), in particular the support plate ( 4 ) at a distance parallel to the longitudinal axis ( 11 ) of the prosthesis head ( 15 ) or its neck ends from 20 to 30 mm, preferably 22 to 26 mm, particularly preferably 24 mm. Prosthesis body according to one of the preceding claims, characterized in that a prosthesis head ( 15 ) with its neck region, in particular in at least two different angular positions, on the support plate ( 4 ) or a receiving area arranged thereon can be fastened. Prosthesis body according to claim 11, characterized in that the neck region or a projection arranged thereon in a recess, in particular one of at least two recesses on the support plate ( 4 ) can be inserted. Prosthesis body according to claim 12, characterized in that two recesses at least partially overlap, at least in their upper regions, in particular wherein each recess is formed as a bore and the bores starting from a common opening in the support plate ( 4 ) in two different directions. Prosthesis body after one of the previous Claims, characterized in that it comprises at least one connecting element ( 10 ), in particular in each case a connecting element ( 10 ) in a proximal and a distal region, in particular a threaded bore ( 10 ), with which the prosthesis body is connectable to a vibration device. Prosthesis body according to claim 14, characterized in that a connecting element ( 10 ), in particular a threaded bore ( 10 ) in the support plate ( 4 ) and / or at the lower shaft end ( 9 ), in particular of the lateral shaft ( 5b ) is arranged ventrally and / or dorsally. Prosthesis body according to one of the preceding claims, characterized in that the neck of a prosthesis head ( 15 ) is arranged relative to the ventral end surface of the support plate at an angle of 4-5 degrees, in particular 4.4 degrees. prosthesis body according to one of the preceding claims, characterized in that on / in it a chip, in particular RFID chip is arranged for storage and readout of data, in particular in which an identification number and / or a coordinate information is stored to a connection element. Rasp instrument for a prosthesis body one of the preceding claims, with a surface, the rasp projections and that to the surface of the prosthesis body, in particular to its shaft part, is the same shape, characterized that the surface of the prosthetic body is larger than that of the rasp instrument, in particular such that the cross section of the prosthetic body 0.5 to 4 mm at each point, preferably 1 to 3 mm, more preferably 2 mm larger.