Many cases of weak knees or instability are caused by injuries, either from activities, such as running, or an accident. The Dyna Knee Brace special is for mild to moderate medio-lateral instability of the knee, patellar dislocation, subluxation. The open patella design with gentle circular cushion allows more flexibility around knee cap. Inflexible posterior bars, semi rigid medio lateral bars & velcro closures affords moderate immobilization to the weak knee joint submit injury / post-surgery.