System for Determining a Force Being Generated by a Patient

A system for determining a force being generated by a patient during a range of motion, the system comprising:

• a tether having a first end and a second end, the first end of the tether adapted to be biased by the patient during a motion so that a tension force is applied along the tether during the motion;
• a motor fixed relative to a frame, the motor comprising a shaft having an axis of rotation, the tether being connected to the shaft so that when the tension force is applied along the tether during the motion the tether generates a torque about the shaft in a first direction about the axis of rotation of the shaft;
• a control module in communication with the motor and adapted to control the motor to generate a motor torque in a second direction about the axis of rotation of the shaft, the second direction being opposite the first direction, when the tension force is applied along the tether during the motion;
• a recording module for storing the motor torque at a plurality of intervals during the motion and for storing a cumulative rotation of the shaft at each of the intervals;
• a display module for generating a plot of a position of the patient versus a force generated by the patient;
• wherein the position of the patient corresponds to the cumulative rotation of the shaft in the first direction about the axis of rotation of the shaft at each of the intervals;
• wherein the force generated by the patient corresponds to the amount of motor torque at each of the intervals.