Affiliations: [a] Department of Physical Therapy, School of Rehabilitation Therapy, Queen's University, Kingston, Ontario, Canada
Note: [*] Address reprint requests to Roy P. Walmsley, PhD, Department of Physical Therapy, Queen's University, Kingston, Ontario K7L 3N6, Canada.
Abstract: Movement of the glenohumeral joint while subjects performed shoulder abduction/adduction on the Cybex dynamometer (CYBEX, Ronkonkoma, NY) was analyzed with a procedure similar to that described for the analysis of shoulder flexion/extension. The axis of the glenohumeral joint was aligned with the axis of the Cybex and verified by construction of a special frame that fit directly over the dynamometer spindle and thus revolved with the Cybex lever arm. Five subjects were studied, one of whom performed the movement on three separate occasions. Distinct from the first experiments, the subjects were only tested at one speed of movement: 60 deg/sec. As previously, the glenohumeral joint was found to traverse approximately 8 cm from its position of initial alignment with the axis of the Cybex dynamometer to its position with the arm in full elevation.
Keywords: Axis of rotation, movement pattern, abduction/adduction
