A 68-year-old patient is 8 weeks post-operative following a…
A 68-year-old patient is 8 weeks post-operative following a reverse total shoulder arthroplasty. The patient demonstrates improved passive and active-assisted motion but continues to have difficulty generating active elevation against gravity. Observation reveals substitution patterns including trunk extension and shoulder hiking. Which of the following best explains the biomechanical change following this procedure that affects the patient’s movement?