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A Simplified Mechanical Model to Predict Motion Restrictions of the Partially Paralyzed Shoulder


 Shoulder motion has been studied by several researchers as a control source for a variety of rehabilitative systems such as functional electrical stimulation for the past 20 years (Mortimer et al., 1973) (Johnson and Peckham, 1990) (Fass et al., 1995). In particular studies involving partial paralysis of the muscles controlling the shoulder (such as with spinal cord injuries at the C5 and C4 level) have produced kinematic results which suggest that elevation and retraction of the shoulder are coupled. With an appropriate model of the partially paralyzed shoulder it might be possible to simulate a variety of motions which evaluate currently employed control algorithms. To that end a simplified mechanical model was developed to investigate the feasibility of developing a more complicated model of the partially paralyzed shoulder. The results of the mechanical model predicted that motion of the paralyzed shoulder would indeed be a coupling of elevation and retraction.