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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.
Stage 1: Rest, Ice, Elevate and Compress to reduce swelling, pain and bruising. If necessary, use crutches to enable the knee to rest and reduce the weight on the knee, until pain allows full weight bearing. You may be prescribed anti-inflammatory medications such as Ibuprofen to ease the pain.