Osteotomy system for knee arthroplasty

Abstract

The invention relates to the field of orthopaedic surgical operation instruments, and provides an osteotomy system for knee arthroplasty. The system includes a tibial osteotomy locator, a femoral osteotomy locator, a force line-angle meter and the like. The tibial osteotomy locator is shaped as an ancient Chinese character 'cao' (which means 'grass' in English). The femoral osteotomy locator is divided into a type1 femoral osteotomy locator and a type 2 femoral osteotomy locator. The type 1 femoral osteotomy locator is approximately shaped as the ancient Chinese character 'cao' with two side arms flush with the front end of an intermediate arm. The type 2 femoral osteotomy locator is approximately shaped as the ancient Chinese character 'cao' with a horizontal line extending out of two side arms. The force line-angle meter is used for measuring whether the osteotomy surface is perpendicular to a force line on the coronal plane of femur and tibia and for measuring the posterior slope ofan osteotomy groove on the tibial plateau during the operation. In the process of artificial knee replacement using posterior stable prosthesis, an osteotomy measurement technology and a gap balancetechnology are integrated to improve the accuracy of tibial osteotomy, femoral osteotomy and reconstructed knee joint force line.

Description

technical field [0001] The invention relates to the field of orthopedic surgery operating instruments, in particular to an osteotomy system used in knee joint replacement. Background technique [0002] Total knee replacement is an effective treatment for advanced knee osteoarthritis. It mainly includes: measuring osteotomy technique and gap balancing technique. No matter what technique is used for total knee arthroplasty, the ultimate goal is to correct the alignment of the knee joint and to balance the flexion-extension gap and the medial-lateral gap. [0003] There are many ways to determine the line of force of the knee joint during the operation, but the method of determining the line of force in the coronal position (left and right direction) is generally to measure the midpoint of the ankle joint through the body surface with an ankle grasper, and then determine it as The center of the ankle joint and the center of the knee joint are often determined with reference t...

AI Technical Summary

Problems solved by technology

Corresponding methods and tools for measuring gap balance emerge in endlessly, but most of them are independently designed and are not compatible with the existing osteotomy templates. During the femoral osteotomy operation, it is necessary to insert the medullary cavity positioning rod into the femoral medullary cavity for positioning, which may cause the fat in the medullary cavity to be squeezed and cause the fat to enter the blood circulation, resulting in life-threatening complications such as fat embolism, and may also lead to the occurrence of life

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