How are joint free bodies created?

　　1, from the detachment of articular cartilage surfaces, such as exfoliative chondromalacia; 2, from the debris after articular cartilage fracture or osteochondral fracture; 3, osteoarthritis marginal bone fragment detachment or articular cartilage debris detachment, mostly associated with chronic wear and tear or incidental injury; 4, from the synovium, such as synovial osteochondroma; 5, meniscal rupture can also lead to the formation of free body by detachment of fibrous fragments, but it is relatively rare.　　It is common in the knee, hip and elbow joints. Treatment if there are no symptoms can be conservative observation, if there are symptoms, because the surgery to remove, surgical methods are arthroscopic removal; incision to remove.