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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.
Knee Strengthening Exercises. Knee strengthening exercises are one of the best ways to cure knee pain. People who do them have less pain, recover quicker from injuries, function better and have less chance of problems recurring in the future. Knee strengthening exercises can be used to help relieve and sometimes even prevent various causes of knee pain.