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ARW is a computer aided tool that enables understandable, uniform and objective patient arm functionality evaluation during upper extremity treatment. Input data to the ARW program are subject height, shoulder ranges of motion (flexion, retroflexion, abduction, adduction, external and internal rotation) and elbow flexion range. On the basis of input data and kinematic upper arm model with 7 degrees of freedom ARW calculates arm reachable workspace. The upper arm model includes two rotations in shoulder girdle (depression/elevation and retraction/protraction), one translation (imitate the changes of a distance between the trunk and glenohumeral joint), three perpendicular rotations in glenohumeral joint (adduction/abduction, retroflexion/flexion and external/internal rotation) and one rotation in elbow joint (flexion). Arm reachable workspace represents all wrist positions in space. ARW program gives numerical and graphical results. Therefore, based on arm reachable workspace volume, graphics and orientation with respect to the body, the therapist can observe patient improvement, evaluate recovery, predict the arm functionality for normal life or work, and also objectively compare different patients. |