Knee joint soft tissue balance measuring device and measuring method thereof

Abstract

The invention provides a knee joint soft tissue balance measuring device and measuring method. The measuring device comprises a reference plate, a movable plate, a base body, a driver, a gap indicator, an outward rotating indicator and a load indicator, wherein the reference plate is fixedly connected to the base body; the movable plate is rotatably connected to the driver; the gap indicator is connected with the driver; the outward rotating indicator is connected with the movable plate; the load indicator is connected with the driver; and the driver is arranged on the base body. The measuring device and the measuring method provided by the invention have the advantages that the extending gap, the knee bending gap, the thighbone physiological outward rotating angle and the exerted load can be integrally measured at the same time; before the knee bending gap is formed, the prejudgment can be performed according to parameters obtained through measurement and the original soft tissue balance conditions; and the knee bending gap conforming to the physiological feature is determined, so that the expected perfect soft tissue balance can be obtained.

Description

technical field [0001] The invention relates to a surgical tool used in total knee joint replacement surgery, in particular to a knee joint soft tissue balance measuring device and a measuring method thereof. Background technique [0002] The knee joint is mainly composed of the femur, tibia and patella. The joint capsule is attached to the periphery of the articular cartilage of each bone. The surrounding joint capsule is reinforced by ligaments. The knee joint is composed of the joint capsule, ligaments, muscles, tendons, nerves, blood vessels, etc. Joint soft tissue. [0003] With the advent of an aging society, knee joint disease has become a common disease that affects the quality of life of the elderly. Total knee arthroplasty is an effective method for the treatment of advanced knee disease. Total knee replacement refers to replacing the knee joint that has been severely damaged and unable to perform normal functions with artificial prosthesis, so as to eliminate th...

AI Technical Summary

Problems solved by technology

[0010] In the above process, not only multiple pieces of surgical instruments are required to be used together, but also, since the external rotation angle on the tool provided by the manufacturer is given, it often does not match the external rotation of the patient's own femur, so this artificial setting of the femur The method of external rotation angle is likely to bring great difficulties to the subsequent osteotomy and soft tissue balance

In addition, because the balance between the straightening gap and the knee flexion gap and the balance of the inner and outer soft tissues depends entirely on the experience of the user, even if the straightening gap and the knee flexion gap are equal in size, the corresponding load applied cannot be quantified, that is, the corresponding soft tissue tension balance

Therefore, the soft tissue balance is not really achieved, and it is impossible to determine the external rotation angle and perform soft tissue balance according to the patient's own physiological conditions before the knee flexion gap is formed.

[0011] In some existing patent documents, some measuring instruments used in total knee arthroplasty have been described, for example, the soft tissue balance isotonic measuring instrument for total knee joint replacement disclosed in Chinese patent application No. 200620014638.1, and the disclosed Chinese patent application No. However, these instruments can only measure the size of the extension gap of the knee joint and the size of the knee flexion gap after the amputation of the posterior femoral condyle, but cannot measure the external rotation angle of the posterior femoral condyle, nor can it Quantify the corresponding load applied, so the soft tissue balance cannot be performed according to the patient's own physiological conditions before the formation of the knee flexion gap. Only the size of the straightening gap and the knee flexion gap is measured, and the real soft tissue balance cannot be achieved

Images