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Invited Commentary

PM Ludewig, PT, PhD, is Associate Professor, Program in Physical Therapy, Mayo Mail Code 388, The University of Minnesota, 420 Delaware St, Minneapolis, MN 55455 (USA)

Address all correspondence to Dr Ludewig at: ludew001@umn.edu

Because this article has no abstract, we have provided an extract of the full text and any section headings.

Lin and colleagues¹ have undertaken an investigation to identify the resting or "loose-packed" position of the glenohumeral joint by quantifying the humeral head anterior and posterior translations and axial rotation range of motion across a variety of scapular-plane abduction positions in subjects who are healthy. I thank the authors for their efforts in contributing to the expansion of knowledge on shoulder biomechanics. Such studies provide a potential foundation for refinement of current diagnostic and treatment approaches for shoulder joint pathology in patients. From a measurement perspective, a specific strength of the study was the use of controlled forces and torques imposed on the joint during the test procedures.

Measurement of glenohumeral joint translation is particularly challenging in vivo. The authors used a technique to estimate the glenohumeral joint center that has been demonstrated to be stable in a plastic ball-and-socket model.² However, any surface-based testing method is not immune from . . . [Full Text of this Article]

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