Knee joint replacement flexion and extension gap measuring and balancing device

Abstract

The invention relates to a knee joint replacement flexion and extension gap measuring and balancing device. The device comprises a connecting and positioning shaft, a movable tibial plateau supportingplate and a fixed femoral condyle supporting plate; ratchets are distributed on the surface of the connecting positioning shaft in the axial direction, and holes are formed in the top end; an openingis formed in the U-shaped bottom plate surface of the movable tibial plateau supporting plate; the movable tibial plateau supporting plate is further provided with a pawl middle portion, the top endsof pawls are used for abutting against the ratchets, and the tail ends of the pawls are connected to the movable tibial plateau supporting plate through a spring; and a connecting shaft is arranged at the U-shaped bottom of the fixed femoral condyle supporting plate and provided with an expansion block. A guide block is vertically arranged on the fixed femoral condyle supporting plate, and a drill bit guide hole is formed in the guide block. The device has the advantages that the joint gap can be conveniently measured and balanced, and total knee replacement is facilitated.

Description

technical field

[0001] The invention relates to a joint surgery tool, in particular to a measuring balance device for knee joint replacement flexion and extension gap. Background technique

[0002] The balance of the extension and flexion gap in total knee arthroplasty is the key to the success of the operation. At present, most operators use the measurement osteotomy method to perform osteotomy of the posterior femoral condyle using the femoral anatomical landmark line. This method cannot accurately reflect the extension and flexion gap and The soft tissue tension on the inside and outside of the knee joint will easily lead to the flexion gap being larger than the extension gap after surgery, and lead to an imbalance in the tension between the inside and outside gaps, which will cause postoperative joint instability and lead to surgical failure. The gap balance device can avoid the above situation as much as possible.

[0003] The extension-flexion gap and the extension-fl...

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