Knee Pain and Problems Common knee problems include sprains, strains, torn cartilage, and arthritis. Torn Meniscus Meniscus tears can occur during a rotating movement while bearing weight, such as when twisting the upper leg while the foot stays in one place during sports and other activities. Ligament Injuries to the Knee The anterior cruciate ligament (ACL) is one of the most common ligaments to be injured. Learn about the four major ligaments of the knee. Evaluation Procedures To help the orthopedist determine your treatment, you'll need a physical exam, a medical history profile, and a description of symptoms. Treatment Plans For most orthopedic disorders and injuries, more than one form of treatment may be appropriate. Arthroscopy Orthopedic surgeons use arthroscopy to diagnose and treat joint problems. An arthroscope is a small, tube shaped instrument that is used to look inside a joint. Joint Replacement Surgery Joint replacement is a surgical procedure to remove and replace an arthritic or damaged joint with an artificial joint, called a prosthesis. Knee Replacement Surgery When a knee is severely damaged by disease or injury, an artificial knee replacement may be considered.