Articular surface retaining type extendable tibial neoplasm knee joint prosthesis

Abstract

The invention discloses an articular surface retaining type extendable tibial neoplasm knee joint prosthesis. The prosthesis comprises a steel plate type tibia proximal prosthesis, a patellar ligament fixing plate, an adjustable backbone extending joint, an adjusting nut, an adjustable medullary cavity extending handle and a fixing assembly; the steel plate type tibia proximal prosthesis is provided with a groove with a bone trabecula porous structure, the patellar ligament fixing plate is arranged in the groove with the bone trabecula porous structure, the adjustable backbone extending joint is arranged on the lower portion of the steel plate type tibia proximal prosthesis, the lower portion of the adjustable backbone extending joint is provided with a lower tibia segment, the adjustable medullary cavity extending handle is arranged on the lower tibia segment, and the lower tibia segment is fixed to the adjustable backbone extending joint in a matched mode through the adjustable medullary cavity extending handle. According to the articular surface retaining type extendable tibial neoplasm knee joint prosthesis, a bone growth function of a child patient can be guaranteed while a knee joint movement function is retained; in addition, the end face, closely attached to the osteoepiphysis, of the steel plate type tibia proximal prosthesis is provided with the bone trabecula porous structure, therefore, bone growth is promoted, a long-term biological fixation effect is formed, and the service life of the prosthesis is prolonged.

Description

technical field [0001] The invention relates to the technical field of artificial prosthesis replacement, in particular to an extendable prosthesis for bone defect reconstruction after extremity malignant bone tumor resection, which retains the articular surface. Background technique [0002] Primary and secondary malignant bone tumors are motor system tumors that seriously threaten the survival and quality of life of patients. With the development of surgical techniques, the innovation of tumor imaging technology and the development of neoadjuvant chemotherapy for patients with malignant tumors, limb salvage surgery has become a consensus in the treatment of malignant bone tumors. Malignant tumors that occur in the long backbone of the limbs need to follow the principle of extensive resection in clinical practice. Therefore, the reconstruction of the bone defect after tumor resection has attracted much attention, especially in children. In recent years, children are a frequ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an extensible tibial tumor knee joint prosthesis that retains the articular surface, so as to solve the problem of destroying the knee articular surface, ligaments and soft tissues in the prior art, resulting in poor anatomical alignment of the joint after surgery, Complications such as joint instability, dislocation, prosthetic loosening, and fracture will affect the short-term and long-term function of the knee joint, especially in children. Because the epiphysis of children is not closed, the traditional artificial prosthesis will destroy the knee joint The surface, epiphysis, ligaments and soft tissues will not only cause poor joint function after operation, but also affect the growth function of the affected limb, resulting in unequal lengths of left and right legs, walking lameness and other phenomena in severe cases. In the second revision operation, the extension rod in the patient's medullary cavity needs to be taken out during the second operation. The operation is very cumbersome, and the physical damage caused to the patient is also a technical problem.

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