Abstract: A system for identifying muscular abnormalities in a human patient and diagnosing musculoskeletal disorders from the abnormalities includes collecting electromyographic signals from selected muscles of the patient while the patient undergoes a plurality of protocols, creating muscle activity samples from the electromyographic signals collected from the patient, defining one of more indices by algebraically combining selected muscle activity samples, calculating the index of the patient from the selected group of collected samples, and comparing the index to a normative range of values for the index to determine whether the patient has a muscular abnormality and to diagnose the abnormality. The system is employed to identify dysfunctional psychophysiological and biomechanical muscle patterns in the upper quarter and forearm of the patient.