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Review Question - QID 7847

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QID 7847 (Type "7847" in App Search)
A 42-year-old man sustained a displaced humeral surgical neck fracture that was well-fixed with proximal humeral plating. Postoperative management consisted of a sling for 6 weeks, followed by physical therapy. Examination at 4 months after surgery revealed passive 90 degrees forward elevation, 10 degrees external rotation, and internal rotation to the greater tuberosity. Radiographs show an anatomically healed fracture and no evidence of loose hardware; the plate is appropriately positioned. What is the most likely reason for the decreased range of motion?