It is Speacially designed for effective administration of progressive reistance exercises to the knee joint muscle groups, both quardiceps and hamstring acn be exercised without changing the position of the patients. Resistance bar is calibrated sp that resistance can be varied form minimum to maximum without adding weights. the unit consist of foam padded seats and backrest. The torque unit consist of two lever arms one of which hold the weight while other provide contact with the paient.