One polycentric knee hinge for all functional casting requirements. Can be used as a free motion joint, drop lock joint, limited motion joint (any range) or locking joint (any position). Manufactured from hardened aluminium with wide plastic attachment wings. Radiolucent for better x-ray visualisation. Flexion and extension controls limit knee motion to any range desired or lock in any position. Reference marks on arm and housing for easier setting of motion control.