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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.
After surgery, and for the first two weeks, ice is more effective in reducing swelling and pain. After complete healing of the skin and removal of staples, you can use a moist heat pack if it feels comfortable. Once healed, soaking the knee in a hot tub helps, too.