[header] How to unlock your knees [title] Stop all activity and rest your knee. [step] If you injured your knee during a sporting event or other activity, stop immediately and rest the knee joint. If you have some range of movement in your knee, ask someone to help you walk to the nearest safe place to sit, and rest for as long as possible. 
Additional movement can further damage the knee joint. [substeps] If you have no movement in your knee, visit the doctor immediately or contact emergency services, as it might be a broken or dislocated kneecap, which requires immediate medical attention.