Donjoy Tru Pull Short Patella Knee Brace Orthopedic Knee Brace Patella Centering Treatment of patellofemoral dysfunction: Pain relief from subluxation, lateral dislocation, mal-tracking and patellar tendinitis. Elastomeric bifurcated strap: Provides dynamic traction on the patella during knee extension. Adjustable Buttresses: Superior, inferior and lateral patellar support with .25" and .375" buttresses. Stability and comfort: Breathable material for light and comfortable support, available with or without popliteal cutout. Prevention of rotation: Independent anchors prevent rotation of the brace for optimal stability.