Ossur Rebound PCL Custom Knee Brace Options:Left KN3298 Available in four sizes from Available in four sizes from the 17 seat height Piper Super Mini DX to the new Piper MDX to the new 23 seat height Piper Tall DX now with taller handles up to 39 With the new quilted padded seat cushion and wide back strap pad Designed to apply a physiologically correct dynamic force optimum for rehabilitation of posterior cruciate ligament (PCL) ruptures whether during functional treatment or post surgical reconstruction A Dynamic Tension System designed to increase the load on the tibia as the knee goes through flexion providing an anterior drawer force that reduces the load on the PCL