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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.
To reduce pain and swelling, make sure to elevate your leg while at home, and for the first several days (48 hours), ice the knee for 20 to 30 minutes a few times per day to minimize pain and swelling. On discharge, patients will receive a prescription for pain medication.