The knee is the largest joint in the body. The upper and lower bones of the knee are separated by two discs (menisci). The upper leg bone (femur) and the lower leg bones (tibia and fibula) are connected by ligaments, tendons, and muscles. The surface of the bones inside the knee joint is covered by articular cartilage, which absorbs shock and provides a smooth, gliding surface for joint movement.
Knee pain can be caused by a sudden injury, an overuse injury, or by an underlying condition, such as arthritis. Treatment will vary depending on the cause. Symptoms of knee injury can include pain, swelling, and stiffness.
Common Causes of Knee Pain
Osteoarthritis : Arthritis is a chronic condition that causes joint inflammation.
Rheumatoid arthritis : In rheumatoid arthritis, your body’s cells attack your own tissues. Rheumatoid arthritis affects three to five times more women than men and often presents between the ages of 20 and 50.
Bursitis : Bursitis is the inflammation of any of the fluid-filled sacs (bursae) protecting the body’s joints. This is usually caused by repetitive motions or by a stress such as kneeling. Sometimes, a sudden injury can cause bursitis.
Tendonitis : The tendons - rope-like tissues connecting muscles to bone at the knee and other joints - can become painfully inflamed by repetitive and strenuous movement. Tendonitis is a common sports injury.
Patellofemoral pain syndrome (PFPS) : Knee pain or discomfort while walking up and down stairs, jumping or squatting may be symptoms of patellofemoral pain syndrome.
Injuries : Knee injuries can be the result of sports, falls or trauma. They typically involve the ligaments that hold two of the bones of the knee - the femur and tibia - together eg-ACL,MCL,& Meniscal injuries.