US Patent 9474675 Knee rehabilitation apparatus

A foot cradle is mounted on tracks on a base for reciprocal motion for passive knee flexion or resistance knee flexion in either direction along the axis of the rectangular base. Resistance is supplied by resistance bands connected at both ends of the base and connected to the foot cradle. The foot cradle can be fixed in any desired position for assisted knee straightening exercises. The patient's foot is secured in the foot cradle by straps and a thigh strap keeps the patient's upper thigh in proper relationship to the apparatus.