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Knee replacement, or knee arthroplasty, is a surgical procedure to replace the weight-bearing surfaces of the knee joint to relieve the pain and disability of osteoarthritis. It may be performed for other knee diseases such as rheumatoid arthritis and psoriatic arthritis. In patients with severe deformity from advanced rheumatoid arthritis, trauma, or long standing osteoarthritis, the surgery may be more complicated and carry higher risk. Osteoporosis does not typically cause knee pain, deformity, or inflammation and is not a reason to perform knee replacement.
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The knee joint joins the thigh with the leg and consists of two articulations: one between the femur and tibia, and one between the femur and patella.[1] It is the largest and most complicated joint in the human body.[2] The knee is a mobile trocho-ginglymus (i.e. a pivotal hinge joint),[3] which permits flexion and extension as well as a slight medial and lateral rotation. Since in humans the knee supports nearly the entire weight of the body, it is the joint most vulnerable both to acute injury and the development of osteoarthritis.
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Chondromalacia is caused by the disproportionate development of muscles around the knee. The muscles then pull the knee cap in an abnormal direction. The undersurface of the knee cap starts to rub against other parts of the knee joint and pain develops.
This condition can get better on its own over time, but it may take several years.
To hasten recovery, you may need to modify your exercise program. If you are a cyclist, you may want to try lower gears. If you are a runner, you may need to temporarily decrease the intensity of your program. Consider low impact or no impact sports like swimming.
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Knee pain: Arthritis:
Arthritis In The Knee: Arthritis in the knee most often refers to osteoarthritis. In this disease, the cartilage in the joint gradually wears away.
In rheumatoid arthritis, which can also affect the knees, the joint becomes inflamed and cartilage may be destroyed. Arthritis not only affects joints, it can also affect supporting structures such as:
muscles tendons ligaments

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Chondromalacia Knee Pain and KNEE EXERCISES:
Chondromalacia, or runner’s knee, is a condition where the articular cartilage, located underneath the kneecap (patella), starts to soften and break down. This cartilage is usually smooth and allows the knee joint to move freely as the knee bends. However, as chondromalacia worsens, the cartilage breaks down, causing irregularities and roughness on the undersurface of the patella, which leads to irritation and pain of the knee joint.
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