DE1943598B2 - HIP PROSTHESIS PART TO REPLACE THE HIP JOINT HEAD, THE THIGH NECK AND THE UPPER PART OF THE THIGH BONE - Google Patents

Description

From SU-PS 1 24 585 a hip joint prosthesis part is already in the preamble of the claim! described type known. The prosthesis of the femoral head is over the neck with the inner bone pin Connected at an angle equal to the angle between the neck and the diaphysis. Here is the Neck connected to the inner bone pin from the side and thus forms at the junction with this one almost right angle.

The known hip joint prosthesis part has generally proven itself well in practice, but it has However, disadvantages also highlighted, the cause of which is to be sought in the imperfection of the shape of the prosthesis should be. In particular, breaks at the junction of the neck with the internal bone pin, occasionally pain after the usual acclimatization period for an inadequate mechanical connection between the inner bone pin and the remainder Thighbones or on the position of the hip-joint-socket-side end of the neck opposite the acetabulum. The well-known hip joint prosthesis also has the Disadvantage that with her there is no possibility of reattaching or replacing the rolling mound.

From CH-PSn 4 39 581 and 4 59 462 are prostheses of the hip joint head with a ball head and a Inner bone pins known, which are directly connected to one another, i.e. without a neck. At the transition point is a thickening is provided which is arranged at an angle to the inner bone pin. These copiprostheses cannot be used for total prosthetics of the hip joint. The curved one is missing Throat.

From FR-PSn 14 48 955 and 15 06 594 prostheses of the acetabulum and the hip joint head are known. The hip joint head is the direct extension of the inner bone pin. A neck is not provided. The prerequisite for the usability of these prostheses is that the entire femur can be preserved except for the ball head and the femoral neck.

From US-PS 31 02 536 finally a prosthesis of the hip joint head with the ball head and a neck is known, which is carried out eccentrically with respect to a disk-shaped compression (not with respect to the inner bone pin). This restricts the mobility of the operated limb, which can lead to aseptic necrosis (osteochondritis dissecans) and reduce the dynamic strength of the prosthesis .

The invention is based on the object of creating an artificial hip joint prosthesis file for replacing the entire upper part of the thigh bone, which has a high degree of stability, ensures the best possible mechanical connection between the inner bone pin and the rest of the thigh bone and is as well adapted as possible to the natural shape of the hip joint .

D ^; This object is achieved according to the invention by the measures covered by the characterizing part of claim 1.

The arrangement according to the invention results in a high dynamic strength of the hip joint prosthesis part, because the neck is curved from the inner bone pin towards the ball head and because of the Neck gradually merges into the inner bone pin. On the one hand, the thickening makes it safe Support on the rest of the thigh bone is achieved, so that an axial migration of the hip joint prosthesis part is prevented. On the other hand, the previously resected rolling hillock can be restored to the thickening be attached. Overall, the arrangement according to the invention results in a very lifelike one Reproduction of the hip joint and the movements that occur during it, so that the acclimatization period, during which the prosthesis causes pain, is extremely short.

A particularly lifelike replica of the hip joint prosthesis part is achieved when using the measures described in dependent claim 2.

The mechanical connection between the inner bone pin and the rest of the femur is particularly good when the measures described in dependent claim 3 are used.

The invention is explained in more detail using the exemplary embodiment shown in the drawing. the The drawing shows a view with partial sections of a hip joint prolhesis.

The hip joint prosthesis contains the jointly engaged prostheses of the hip joint shell t and the hip joint part designed according to the invention, consisting of the hip joint head 2, curved neck 3 and inner bone pin 4.

The curved neck 3 represents an extension of the inner bone pin 4. The tangent to the neck axis runs at a small acute angle to the axis of the inner bone pin 4. The base 6 of the neck 3 lies eccentrically in relation to the inner bone pin 4, specifically displaced in the direction of the curvature of the neck 3.

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The edge of the base 6 of the neck 3 coincides with that of the disc-shaped thickening 5 of the inner bone pin 4 together.

The disc-shaped thickening 5 has a hole for the pin 7 on its side surface Attachment of the trochanter nvjjor on. The inner bone pin 4 is conical according to the shape of the bone marrow canal of the thigh.

On the inner bone pin 4 is below the disc-shaped thickening 5 a disc 8 with a sleeve 9 placed, the diameter of the Disc 8 is larger than that of the disc-shaped thickening 5. This creates a particularly strong one Connection between the inner bone pin 4 and the rest of the femur achieved.

The hip joint prosthesis part is inserted as follows:

The upper end of the thigh bone is enclosed through a straight side cut. The trochanter major is cut off with a chisel and together with the muscles attached to it The thighbone is pushed away by means of a chisel in the transverse direction at the same height as the our edge of the lesser trochanter cut through. Now, together with the femoral neck, means The head of the femur is removed using a gouge. With a cone, the shape of the inner bone pin 4 corresponds to the prosthesis, the bone marrow canal in the femur is now processed. The inner bone pin 4 is then inserted into the thighbone by means of a rotary handle and a hammer used. In addition, the socket prosthesis, which is provided with projections 10 in the usual manner 1 fixed in a recess prepared by milling in the area of the natural pan. Of the previously knocked off roll hill, which lies on the outside of the thigh bone, is by the pin 7 on the attached to the outer surface of the upper end of the patient's femur. The wound can now are sewn tightly in layers.

1 sheet of drawings

Claims (3)

Patent claims: 1. Hip joint prosthesis part to replace the hip joint head, the femoral neck and the upper part of the femur, which is articulated with a prosthesis in the acetabulum Engagement is, and in which the femoral head has a curved neck with a continuous straight inner thigh pin ver is bound, characterized in that the curved neck (3) is designed as an extension of the inner bone pin (4) which is attached to the Transition point to the neck has a disc-shaped thickening (5) so that the base (6) of the Neck rests on the thickening. 2. Hip joint prosthesis part according to claim 1, characterized in that the base (6) of the neck (3) is arranged eccentrically with respect to the inner bone pin in the direction of the curvature of the neck, and that the edge of the base of the neck on its concave side with the edge of the disc-shaped thickening (5) of the inner bone pin (4) coincides. 3. Hip joint prosthesis part according to claim 1 or 2, characterized in that below the disc-shaped thickening (5) on the inner bone pin (4) a disc (8) with a sleeve (9) is placed, the diameter of the disc is greater than that of the disc-shaped thickening.