Previous studies, using imaging techniques[4] and mathematical models, have predicted that loads up to 90% of body weight are transmitted across the glenohumeral (GH) joint at 90° of abduction[2, 3]. However, in comparison to weight-bearing joints like the hip and knee, there is little quantitative data describing 3-D reaction forces generated at the GH joint during active motion. This information is important to our understanding of GH joint function in both normal and pathological conditions. It can also provide an experimental validation for computational models of the GH joint.

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