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Logo for the Journal of Rehab R&D
Vol. 40 No. 2, March/April 2003
Pages 147 — 156

The globe system: An unambiguous description of shoulder positions in daily life movements

Caroline A.M. Doorenbosch, PhD; Jaap Harlaar, PhD; DirkJan (H.E.J.) Veeger, PhD

Department of Rehabilitation Medicine, VU University Medical Center, Amsterdam, The Netherlands; Institute of
Fundamental and Clinical Human Movement Sciences, VU, Amsterdam, The Netherlands; Faculty of Human
Movement Science, VU, Amsterdam, The Netherlands; Man-Machine Systems Group, Department of Mechanical
Engineering, Delft University of Technology, Delft, The Netherlands

Abstract: Positions of the shoulder joint are commonly described in terms of degrees of humeral elevation in the principal planes. This approach is inadequate for an accurate and unambiguous description of functional arm movements that are not confined to these planes. In this paper, a general unambiguous method for describing shoulder positions is adopted and visualized in globe graphs. This facilitates the use and interpretation of the method in clinical practice. To illustrate this globe system of description, a healthy subject participated in the experiments. The shoulder position is described for several functional and standardized tasks for the upper limb with three angles: (1) the angle of the plane of elevation, (2) the angle of elevation within the plane of elevation, and (3) the angle of axial rotation. With these parameters, the position of the upper arm can be visualized as a position on a "globe" about the shoulder joint. Although not perfect, the globe system provides the most unambiguous description of functional thoracohumeral positions, which is easy to apply in clinical practice.

Key words: clinical application, daily life activities, movement analysis, shoulder, 3D description.

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