There is a line of force from the center of the femoral head through the intercondylar fossa to the center of the ankle joint, which is a straight line. However, if the feet can fit more than 2 fingers in the middle of the knee, we call it an “O” leg, or an “inversion of the knee”. Rotated legs. It is most common in soccer players. But the danger of inversion of the knee does not lie in the appearance, as many people do not have pain until they are 40 years old, even though they look very bad. But after middle age, when weight increases and degeneration begins to be severe, the inward shift of the force line caused by the inversion of the knee increases the wear and tear on the joint surface of the femur on the inside of the knee, which in turn, over time, increases the inversion deformity. Many women in rural areas who are engaged in manual labor have severe osteoarthritis of the knee combined with severe internal derangement of the knee at less than 50 years of age, and there is no alternative to surgery.
Some inversions are congenital and others develop gradually after knee trauma or meniscus surgery. Nowadays, due to eugenics and good nutrition in urban areas, there are very few cases of entropion caused by rickets, but the hardest hit areas are in rural areas, where young and middle-aged people are engaged in heavy physical labor. The surgical correction of internal derangement of the knee for the treatment of severe osteoarthritis in young and middle-aged people is a topic worthy of study.
To correct the deformity of the internal knee, the proximal tibia (calf bone) is osteotomized and re-corrected, and fixed with plates, screws, external fixation frames, and casts. However, a simple, convenient, effective and inexpensive method that is suitable for rural areas is the external fixation frame. The use of external fixation brace in Wangjing Hospital for treatment of internal knee deformity can be traced back to Meng’s brace in 1980s, Professor Meng He used external fixation brace to cure a large number of patients with internal knee deformity. The external fixation frame is removed about 10 weeks after surgery, eliminating the need for secondary surgery. It is an excellent treatment for severe osteoarthritis in young and middle-aged people and is now carried out in many primary hospitals.
Even in cities, many people have internal knee deformity, and now the latest international opinion is to try to preserve their own knee joints and not to easily perform artificial joint replacement, so the deformity should be corrected as early as possible for middle-aged and young people with internal knee deformity. Certain severe osteoarthritis combined with internal knee deformity changes the lower limb force line after orthopedic surgery, and the pain in the medial knee joint disappears in a significant proportion of people, and osteotomy Increasingly, osteotomy is becoming an effective means of treating osteoarthritis.