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Rotational moment arms remain unchanged after reverse shoulder arthroplasty

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BERLIN — Charité researchers found no significant differences in rotational and flexion movement arms and origin-to-insertion distance of the subscapularis and teres minor after lateralized reverse shoulder arthroplasty.

“This is the first study to evaluate function specific movement arms and the origin-to-insertion distance following reverse shoulder arthroplasty with lateralized center of rotation,” Sebastian Herrmann, from the Charité University of Medicine in Berlin, said during his presentation at the 13th EFORT Congress 2012. “With lateralization, we can preserve movement arms and also the muscle tension as measured by the origin-to-insertion distance, and these results might explain the better functional outcomes following lateralized reverse shoulder arthroplasties as reported by other authors.”

Herrmann and colleagues studied seven cadaveric shoulders that underwent reverse shoulder arthroplasty using a combined in-vivo and in-silico approach. Lateralization was performed using an 8-mm bone block placed between the glenoid and base plate, according to the abstract. The investigators measured rotation, origin-to-distance insertion, abduction/adduction and flexion/extension muscle movements using four points of glenohumeral adduction.

They concluded that there was no significant difference in rotational and flexion movement arms of the subscapularis and teres minor preoperatively to postoperatively, according to the abstract. When measuring abduction and adduction, they also discovered that movement was significantly smaller after lateralized reverse shoulder arthroplasty.

Reference:

• Herrmann S, Schmidt C, Koenig C, et al. Effect of increased offset on function specific moment arms and muscle length after reverse shoulder arthroplasty. Paper #12-5555. Presented at the 13th EFORT Congress 2012. May 23-25. Berlin.
• Disclosure: Herrmann has no relevant financial disclosures.