What causes knee pain?
Knee pain is a symptom of many different diseases and conditions. Short-term knee pain may be the result of excess stress on the knee. Possible causes of knee pain include:
- Arthritis. Osteoarthritis (joint degeneration), http://www.answers.com/topic/rheumatoid-arthritis (joint inflammation), and http://www.answers.com/topic/septic-arthritis (joint infection) can cause knee pain.
- Bursitis. Inflammation of the http://www.answers.com/topic/bursa of the knee can cause knee pain. Bursitis, sometimes called house-maid's knee, can be caused by infection, gout, http://www.answers.com/topic/rheumatoid-arthritis, injury, illness, or chronic irritation (crawling or kneeling).
- Cysts. A cyst is a fluid-filled http://www.answers.com/topic/sac. Cysts associated with the knee can cause swelling and knee pain or discomfort.
- Fracture. Breakage or crack in any of the bones associated with the knee joint can cause knee pain.
- Gout. A faulty chemical process leads to high levels of http://www.answers.com/topic/uric in the blood which causes inflammatory arthritis, crystal deposits in joints, joint destruction, and joint pain.
- Ligament injury or instability. The ligaments supporting the knee may be injured or strained by persons who participate in sports, particularly football, rugby, http://www.answers.com/topic/lacrosse, basketball, skiing, soccer, and volleyball. Other accidents can also cause ligament damage.
- Loose bodies. This condition refers to any loose objects that float around the knee and cause problems. They also are called "joint mice" because of their elusive nature.
- Meniscus conditions. Damage, usually in the form of a tear, to the http://www.answers.com/topic/menisci can result from degenerative changes associated with advancing age or sports-related injury. Sports that commonly cause menisci damage include football, basketball, soccer, tennis, lacrosse, and skiing.
- Osteonecrosis. Degeneration of the bones associated with the knee cause pain and deformity.
- Patellofemoral pain. Also known as http://www.answers.com/topic/anterior knee pain syndrome, this condition is characterized by pain around the knee cap. The exact cause of patellofemoral pain is unknown but is probably related to muscle inadequacy, lack of flexibility, rapid growth, or bone positioning.