Recommended for normalizing patella tracking and helps reduce anterior knee pain caused by patella instabilities. Provides support for patella malalignment, dislocations, or subluxations. AirCast Hinged Tru-Pull Knee Support is ideal for patients who need a strong support for patellofemoral malalignment, subluxation and dislocations. The Tru-Pull system places a dynamic pull on your patella (knee cap) when you extend your leg, thereby helping to reduce any pain in the knee. This brace is adjustable to accommodate your preference and to give you the leverage you require. Use for symptomatic pain relief of patellofemoral dysfunction including subluxation/dislocation, mal-tracking, patellar tendonitis and ligament stability.