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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.
Ligaments are tissues that hold bones together. Ligaments support the knee and keep the joint and bones in the correct position. They help you walk, twist and turn. There are 4 ligaments that help support the knee. Ask your healthcare provider which of these ligaments was sprained in your knee. Ligaments are often sprained because of an exercise or sports-related injury. Treatment and recovery time depend on the type and cause of the knee sprain.