What causes knee protrusion?

The main causes of medial knee protrusion are knee osteoarthritis, meniscus injury, patellar dislocation or subluxation, knee free body and other causes. The main causes of medial knee protrusion are as follows: 1. Knee osteoarthritis: This is a common knee disease, usually related to age, obesity, excessive use and other factors. The main pathological changes are the wear and destruction of knee cartilage, resulting in narrowing of knee joint space and hyperosteogeny, resulting in medial knee protrusion. 2. Meniscus injury: Meniscus is a fibrocartilage structure in knee joint, which has the function of buffering and stabilizing knee joint. Meniscus injury can lead to knee pain, swelling, limited mobility and other symptoms, and may also cause medial knee protrusion. 3. Patella dislocation or subluxation: The patella is a bone in front of the knee joint that should normally slide stably in the femoral trochlear groove. Patella dislocation or subluxation, will lead to knee medial protrusion, and accompanied by pain, swelling, limited movement and other symptoms. 4. Knee joint free body: knee joint free body refers to the formation of an abnormal substance in the knee joint, usually due to cartilage, osteophyte, synovium and other tissue shedding. Free body may irritate knee joint, cause pain, swelling, limited movement and other symptoms, but also may cause knee medial protrusion. 5. Other causes: In addition to the above reasons, knee medial protrusion may also be related to knee joint infection, tumor, trauma and other factors. In summary, the causes of medial knee protrusion are complex and require detailed clinical and imaging evaluation to determine the specific etiology and appropriate treatment measures.