Abstract: An orthotic device for controlling knee instabilities is disclosed herein that comprises a joint structure, upper and lower support assemblies including C-shaped bands for supporting the joint structure over the knee, an L-shaped condyle pad assembly having an upper portion for supporting the inner condyle region of the knee and an anterior extension for supporting the upper tibia against tibial displacements, and a mounting means including a V-shaped resilient strap for maintaining the upper portion of the condyle pad assembly in intimate supporting contact with the condyle region throughout the entire range of pivotal movement of the knee.