With many other conditions, knee pain is treated with nonsurgical options first. Surgery is considered only when nonsurgical options such as immobilization, physical therapy, or drug therapy have been exhausted. Knee arthroscopy is a common surgical procedure that is used to treat conditions that cause pain in the knee. In this procedure, a small surgical tool equipped with a camera is inserted through small incisions, allowing the surgeon to see inside the knee and carry out the procedure. Some of the conditions treated with arthroscopy include: Kneecap that is out of position; Repair of defect in cartilage; Small pieces of broken cartilage in the knee joint; Some fractures of the bones of the knee; Swelling behind the knee that is filled with fluid – this can occur when there is swelling and pain from other causes like arthritis; Swollen (inflamed) or damaged lining of the joint; Torn meniscus and Torn or damaged ligaments. If nonsurgical treatments options are no longer helpful, you may want to consider total knee replacement surgery. Joint replacement surgery is an effective procedure to relieve pain, correct leg deformity, and help you resume normal activities.