At present, the joint cavity free body removal, generally using the arthroscopic minimally invasive surgery treatment, has been rarely used to open large knife open surgery, arthroscopic minimally invasive surgery is less traumatic, fast recovery, can play a very good treatment effect. Generally speaking, if arthroscopy is used, no significant sequelae will be left. Complications of the surgery are dominated by more common problems, such as neurovascular injury, joint cavity infection, poor recovery of joint function, and free body recurrence. If an open surgery with a major incision is used, there is a more severe surgical trauma, a risk of postoperative scar adhesions, severely limited joint mobility, and an increased risk of infection. In the case of free body recurrence, the etiology of the free body needs to be clarified. If the cartilage degeneration and exfoliation is caused by osteoarthritis, the possibility of recurrence after free body removal is high, and if the cartilage exfoliation or minor fracture is caused by trauma, the possibility of recurrence after free body removal is relatively small.