For those suffering from discomfort in the knee or hip joints, the most likely cause is arthritis. Arthritis is a degenerative disease which causes the deterioration of the cartilage in the joints. This cartilage is essential for providing smooth, frictionless movement in the joint. When it begins to break down--either from general wear and tear, or from a genetic disease--the bones at the joint may begin to make contact and the resulting friction may cause mobility limiting pain and stiffness.
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