Fusion femoral stem system

Abstract

The invention provides a fusion femoral stem system. The system comprises a bent short handle, a fixing mechanism and a femur head prosthesis, and a conical connection body is arranged at one end of the bent short handle; the conical connection body is connected with a conical connection hole of the femur head prosthesis in a matched mode, the other end of the bent short handle is inserted into and extends into the medullary cavity below the lesser trochanter from the bone cutting surface of the femoral neck, and the bent short handle is fixedly connected with the greater trochanter through the fixing mechanism. The fusion femoral stem system has the advantages that after the whole system operation and the sclerotin on the periphery of the bone bed at the near end of the host thighbone completes ingrowth osseointegration, the applied mechanics influence of the remained femoral neck and the sclerotin close to the lesser trochanter and the greater trochanter is basically close to a pre-operation biomechanics state.

Description

technical field [0001] The invention relates to the field of orthopedic implants, more specifically to a fusion type femoral stem system for primary replacement that can preserve the femoral neck to the greatest extent. Background technique [0002] Avascular necrosis of the femoral head is a common progressive disease, and when it develops to an advanced stage, artificial hip replacement surgery is usually required, that is, the necrotic femoral head is first amputated and then implanted in the femoral medullary cavity. Or a femoral stem of an artificial femoral head can be installed to replace the amputated physiological femoral head. At present, the design of the femoral stems of various companies requires that in most cases, the osteotomy should be performed from the greater trochanter to the lesser trochanter when performing hip femoral replacement surgery. In most cases, the bone of the femoral neck is basically healthy and intact, and sometimes even the lower hemisph...

AI Technical Summary

Problems solved by technology

At present, the design of the femoral stems of various companies requires that in most cases, the osteotomy should be performed from the greater trochanter to the lesser trochanter when performing hip femoral replacement surgery. In most cases, the bone of the femoral neck is basically healthy and intact, and sometimes even the lower hemisphere of the femoral head is basically intact. It is a pity that these intact parts are all amputated during the surgical osteotomy; More femoral necks are reserved, and a few brands of femoral stems are designed with short stems to facilitate direct insertion into the femoral medullary cavity, but the mechanical environment of the femoral neck during normal human activities such as tension, compression, pull-out, and torsion is too complicated As a result, the long-term stability of the femoral stem decreases until it loosens and fails

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