Femoral stem prosthesis

Abstract

The invention provides a femoral stem prosthesis. The femoral stem prosthesis comprises a stem body, a neck part and a conical head which are sequentially connected from the distal end to the proximalend and are in an integrated structure, wherein the stem body comprises a proximal end part and a distal end part; the proximal end part comprises a proximal end body and a functional part which connects the proximal end and the distal end of the proximal end body and is close to one side of the neck part; the proximal end body is connected to the distal end part; the size of the functional partis gradually increased from the distal end of the proximal end body to the proximal end of the proximal end body; and the cross section of the functional part connected to the proximal end body is ina pear shape or a gourd shape. The femoral stem prosthesis can well match with a narrow medullary cavity of a DDH patient, the neck part of the femoral stem prosthesis occupies a small space, the trauma to the femur is small, the femoral stem prosthesis is not easy to sink and rotate, few types of instruments are required during the operation, the operation is simple and convenient, the requirement on the operation skill of a orthopedist is low, and the femoral stem prosthesis is not only suitable for DDH patients, but also suitable for the total hip replacement of common patients.

Description

technical field [0001] The invention belongs to the technical field of medical devices and relates to a femoral stem prosthesis. Background technique [0002] Developmental Dysplasia of the Hip (DDH), also known as congenital dislocation of the hip, is mainly caused by developmental defects in the acetabulum, proximal femur, and joint capsule, which lead to joint instability until development Dislocation of the hip joint is one of the main diseases that cause physical disability in children. The incidence of DDH in my country is about 3.9‰, and the male to female ratio is about 1:6. [0003] DDH develops to middle and late stages, and may be complicated by hip osteoarthritis. The patient's articular cartilage is destroyed, the subchondral bone is exposed and cystic, the bone hyperplasia and sclerosis becomes ivory-like, and the joint space narrows or even disappears. At this time, the hip joint has difficulty or almost no mobility, and the clinical symptoms are obvious. T...

AI Technical Summary

Problems solved by technology

Among the femoral stem prostheses for DDH patients, most of them are modular prostheses, that is, each femoral stem is assembled and installed by multiple parts, and the specifications of the prosthesis and surgical instruments are complicated, and the operation is complicated and difficult. Large, requires high surgical skills for orthopedic surgeons, and because of the long stem of the femur, it is more destructive to the medullary cavity

In addition, the overall femoral stem prosthesis for DDH patients has the problem of sinking or rotating and loosening during use, which eventually leads to the failure of the operation, or the problem of severe damage to the distal cortical bone during insertion and even rupture of the cortical bone

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