Use of larger diameter glenosphere yielded significant increase in external rotation after RSA

Patients who received a larger diameter glenosphere during reverse shoulder arthroplasty had a significant increase in external rotation in adduction, as well as abduction strength, at midterm follow-up, according to results.

Researchers collected standard radiographs of 68 reverse shoulder arthroplasties with either a 36-mm (n=33) or a 44-mm (n=35) diameter glenosphere preoperatively and postoperatively at 6 months, 12 months, 24 months and 60 months. Researchers also assessed range of motion, strength, Constant-Murley score and the shoulder pain and disability index at all follow-up visits. Researchers adjusted the effect of glenosphere size on measured outcomes for baseline values, patient gender and humeral head diameter.

At all follow-up assessments, results showed the treatment groups had no significant differences in functional scores. Researchers found greater external rotation in adduction and abduction strength at the 12-month follow-up in patients with a 44-mm glenosphere vs. patients with the smaller implant, and the differences remained at 60 months. Thirty-eight percent of all patients had scapular notching, with no relevant differences between the groups. – by Casey Tingle

Disclosure: Support for this research was provided by the Schulthess Clinic.

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Source:

Müller AM, et al. J Shoulder Elbow Surg. 2018;doi:10.1016/j.jse.2017.06.002.