Knee pain can result from several different things including an injury, pulled or torn ligaments and tendons, damaged cartilage, gait, and even muscle and back injuries. Bone and joint pain in the knee may occur following years of wear and tear playing sports, working or from general leisure activities.

Injuries to the knee can affect the cartilage, ligaments, tendons and the bursae (fluid-filled sacs) that support, stabilize and cushion the knee joint. Some common injuries to the knee include:

• ACL injury – The anterior cruciate ligament (ACL) is one of four ligaments in the knee that provides stability to the knee. Most often this ligament is injured with sudden directional changes with the knee bending inward and forward, tearing the ligament. This is frequently seen in football, basketball and skiing injuries.
• Torn meniscus – The meniscus is tough cartilage that acts as the shock absorber between the femur (thigh bone) and the tibia (shin bone). This also can be torn with a sudden twisting injury to the knee.
• Bursitis – There are small sacs of fluid filled cushion that surround the knee joint. When these become irritated and inflamed, pain occurs, especially with movement.
• Loose body – An injury or general wear and tear can cause pieces of bone or cartilage to become loose and break off. The loose body can interfere with the normal movements of the knee and cause pain with movement.
• Patellar tendinitis – This occurs when there is irritation or inflammation of the tendon around the patella (kneecap). Typically, those who run, ski, cycle and take part in sports involving heavy jumping and stress on the knees are prone to this injury.
• Patellar dislocation – The patella (kneecap) covers the front of the knee and glides through the normal range of motion. If the patella becomes dislocated, pain occurs as there is excessive lateral, or side to side, movement of the patella.

Certain medical conditions also lead to knee pain. These conditions may require you to see one of our APM knee pain doctors in Wisconsin. These include:

• Osteoarthritis – This is the most common type of arthritis. This is usually the result of a wear-and-tear injury where the cartilage breaks down over a period of years from use and with age. As the cartilage disappears, the cushion is destroyed and bone on bone grinding can occur, leading to knee pain.
• Rheumatoid arthritis – This is an autoimmune condition that can affect many other joints in the body besides the knee. This is a chronic disease condition and the severity and impact on a patient is variable from mild to severe.
• Gout – This condition results from excessive uric acid crystal build up in the joints of the body. Typically, patients have the big toe affected as well as the knee.
• Pseudogout – This condition is similar to gout, however, there is a build-up of crystals of calcium pyrophosphate instead of uric acid. Knees are commonly affected by this condition.