Clinical and Radiological Results of Reverse Total Shoulder Arthroplasty Using a 25-mm Glenoid Baseplate

Lee,  Ji Min; Kim,  In Bo; Jung,  Dong Wook

doi:2015.18.4.242

Clin Shoulder Elb > Volume 18(4); 2015 > Article

Original Article

Clinics in Shoulder and Elbow 2015;18(4):242-247.
DOI: https://doi.org/10.5397/cise.2015.18.4.242 Published online December 31, 2015.

Clinical and Radiological Results of Reverse Total Shoulder Arthroplasty Using a 25-mm Glenoid Baseplate

Ji Min Lee, In Bo Kim, Dong Wook Jung

Department of Orthopedic Surgery, Bumin Busan Hospital, Busan, Korea. zeusibk@naver.com

Received: 4 October 2015 • Revised: 8 December 2015 • Accepted: 12 December 2015

Abstract

BACKGROUND: The size of the baseplate used in reverse total shoulder arthroplasty (RTSA) tends to be larger than the average size of the glenoid in the Korean population. The mismatch between the sizes of the baseplate and the patient's glenoid may result in improper fixation of the glenoid baseplate. This in turn may lead to the premature loosening of the glenoid component. Thus, we evaluated the short-term results of using a 25-mm baseplate in RTSA.
METHODS
Seventeen patients with cuff tear arthropathy underwent RTSA with a 25-mm baseplate. The mean age of the patients was 70.1 years, and the mean follow-up period was 14.0 months. We evaluated clinical outcomes preoperatively and postoperatively: the range of shoulder motion, the American Shoulder and Elbow Surgeons (ASES) score, and the Korean Shoulder Society (KSS) score.
RESULTS
We found that the mean ASES score and KSS improved from 35.0 to 74.4 (p<0.001) and from 46.9 to 71.8 (p<0.001) with RTSA. The mean forward elevation and abduction, external rotation also improved from 78.6degrees to 134.3degrees (p<0.05) and from 66.6degrees to 125.0degrees (p<0.05), from 20.2degrees to 28.4degrees (p=0.43). Postoperative complications were seen in 12% of patients, but neither the loosening of the glenoid baseplate nor inferior scapular notching were observed.
CONCLUSION
In sum, the results of using a 25-mm baseplate in RTSA were similar to those of previous reports. Even though the outcomes are those of a short-term follow-up, neither the loosening of the glenoid baseplate nor the scapular notching were observed.

Key Words: 25-mm baseplate; Reverse total shoulder arthroplasty; Glenoid size of the Korean population