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Arthritis or another medical condition could be the cause of a stiff knee. Overuse of the joints and muscles in your knee can also cause stiffness. Strengthening your hamstrings, quadriceps and other knee-supporting muscles protects your knees from stress and the shock of impact, according to American Academy of Orthopaedic Surgeons. Stretching your muscles improves flexibility, which can prevent stiffness and injury.
During knee replacement surgery, knee joints damaged by arthritis can be replaced with an artificial knee, also known as a prosthetic knee. A prosthetic knee can help restore mobility and reduce pain in the affected knee. When the joints of both knees are damaged, double knee replacement may be recommended.