The Effect of Proximal Fibula Osteotomy on Meniscus and Articular Cartilage Using the Finite Element Method

Abstract

Arthritis generally refers to the occurrence of the body's joints and surrounding tissues, by inflammation, infection, degradation, trauma or other factors caused by the inflammatory disease, can be divided into dozens of. The number of people is increasing all over the world. The clinical manifestations are joint redness, swelling, heat, pain, dysfunction and joint deformity, which can lead to joint disability and affect patients' quality of life. Joint space too small can cause arthritis. Joint space means the space between the joints of the body. In the case of the knee joint, the medial part of the knee joint is the cruciate ligament and the meniscus, and above the meniscus is the femur and below the meniscus is the tibia; There are ligaments, bursa, synovium, muscle, tendon, fat and many other structures around the joint. These structures are not closely connected when the knee joint is relaxed. There will be Spaces in these tissues, and there will be joint fluid or tissue fluid in the gap. Patient’s joint space and after fibula osteotomy joint space are shown in Figure 1. Traditional arthritis surgery (High Tibia Osteotomy) is expensive, complex and difficult for older patients to recover from. Proxima Fibula Osteotomy which has emerged in recent years, has the advantages of being less invasive and cheaper. However, without theoretical support from the perspective of mechanical mechanics, this experiment mainly carried out CAE simulation on the leg models of varus angle 0°, 3° and 5° patients, so as to provide theoretical support for the new type of surgery. To study the effect of the-upper and middle fibula osteotomy on the-knee stress in patients with osteoarthritis of the knee. Methods CT scans of the affected knee and full-length weighted X-rays of both lower limbs were performed on a normal male subject. CT data were obtained and a three-dimensional finite element model of the knee was constructed. 3-Matic software to rotate the femur 3 ° and 5 ° to simulate knee stress immediately after proximal fibula osteotomy (PFO) surgery and one month after. Preoperative immediately post-operative, and six months post-operative results indicate that; stress on the medial meniscus had a decreasing trend, while stress on the lateral meniscus increased significantly. Three-dimensional finite element calculations and analysis, theoretically confirmed that upper and middle fibula osteotomy can reduce medial knee stress as a treatment for medial compartment osteoarthritis of the knee.