Distal tibial prosthesis

Abstract

The present invention relate to a distal tibial prosthesis including a distal base and a distal handle, the distal handle comprises a bearing part and a bone trabecular structure layer A arranged on the outer surface of the bearing part, the upper end of the bearing part is connected with the bottom surface of the distal abutment, the top surface of the distal abutment is provided with an anti-rotation table, the top surface of the anti-rotation table is provided with an outer cone, the cross section of the distal handle is elliptical, and the outer surface of the bottom of the distal abutmentis provided with a bone trabecular structure layer B. As the distal handle of the invention is divided into a bearing weight part and a surface bone trabecular structure, the bearing weight part canmeet the load-bearing requirement and promote bone growth, thereby achieving medium-and long-term stability; the cross section of the distal stem is elliptical, which can increase the contact area between the distal tibial medullary cavity and the prosthesis surface, and also can prevent the prosthesis from rotating. It can achieve the initial stability without screw fixation, greatly shorten theoperation time and reduce the difficulty of operation. It can solve the problems of aseptic loosening, initial interface healing and periprosthetic fracture when the distal fixation length of cement tibial shaft prosthesis is insufficient.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a tibial distal end prosthesis. Background technique [0002] With the standardized application of neoadjuvant chemotherapy, the survival time of patients with malignant bone tumors has been significantly improved, and limb salvage surgery has become the main strategy for routine treatment of malignant bone tumors. The distal tibia is an important load-bearing part of the human body, and the special anatomical structure of the distal tibia, relatively complete muscle septum and thin soft tissue coverage make the tumor growth mainly push, poor invasiveness, and easier to be treated by other patients. Early detection, so the long-term survival rate after treatment of malignant bone tumors of the distal tibia is significantly higher than that of other limb malignant bone tumors, so it is particularly important to preserve the long-term function of the ankle. [0003] At...

AI Technical Summary

Problems solved by technology

If the ankle-sparing operation is to be completed in one stage and the functional training and recovery of function can be performed as soon as possible, artificial tumor stem prosthesis replacement should be the first choice. Lower, higher incidence of prosthesis-related complications

However, if ankle arthrodesis and artificial tumor ankle arthroplasty are used, neither of them can obtain satisfactory ankle joint function like tibial shaft reconstruction.

In addition, artificial tumor ankle joint replacement not only needs to sacrifice its own ankle joint function, but also the average survival rate of the prosthesis is significantly worse than that of the tibial shaft prosthesis

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