Causes for knee locking When the knee locks, it is usually due to one of the following conditions: a torn meniscus, loose fragments floating inside the joint or pain that is so severe it limits movement of the knee. treatment of locking knee: Treatment of a locked knee is determined by the cause of the problem. Initial treatment of meniscal tears should be aimed at controlling swelling and inflammation. R.I.C.E. therapy, which stands for rest, ice, compression and elevation, is often recommended along with anti-inflammatory medications and physical therapy. Some patients can then gradually return to their normal activities, while others require surgical treatment. Arthroscopic knee surgery is a minimally invasive procedure performed through a series of small incisions. This allows the orthopedic surgeon to visualize the injury and suture or trim the damaged meniscus. Loose fragments are also typically removed through an arthroscopic procedure. Very large bodies may require an open procedure – arthrotomy – for removal. note: consult orthopedist. I hope you happy with information kindly rate it. thank you.