Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. RIGHT * SIZE: MEDIUM * THIGH CIR. 18.5"-21" * Recommended for normalizing patella tracking and helps reduce anterior knee pain caused by patella instabilities * Provides support for patella malalignment, dislocations, or subluxations * Patented, lightweight material for added comfort * Aluminum hinges for additional support and to help control hyperextension * Easy application and adjustment *