Effect of Preoperative Fatty Degeneration of the Deltoid and the Teres Minor Muscles on the Clinical Outcome after Reverse Total Shoulder Arthroplasty
10.5397/cise.2015.18.3.138
- Author:
Sung Hoon MOON
1
;
Woo Dong NAM
;
Chang Hyun RHEU
;
Jae Woo LEE
Author Information
1. Department of Orthopedic Surgery, Kangwon National University School of Medicine, Chuncheon, Korea. luteus@naver.com
- Publication Type:Original Article
- Keywords:
Massive rotator cuff tear;
Cuff tear arthropathy;
Reverse total shoulder arthroplasty;
Deltoid fatty degeneration;
Teres minor fatty degeneration
- MeSH:
Arthroplasty;
Follow-Up Studies;
Humans;
Magnetic Resonance Imaging;
Muscle Strength;
Muscles;
Shoulder
- From:Journal of the Korean Shoulder and Elbow Society
2015;18(3):138-143
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: To evaluate the effect of preoperative fatty degeneration of deltoid and teres minor muscles on the clinical outcome in patient with reverse total shoulder arthroplasty (RTSA). METHODS: Nineteen patients with RTSA were enrolled. The mean follow-up period was 16.1 months. The fatty degeneration of three distinct parts in each deltoid and the teres minor muscle was measured using a preoperative magnetic resonance imaging. Postoperatively, the muscle strengths for forward elevation (FE), abduction (Abd), and external rotation (ER) were measured using a myometer at the last follow-up. The parameters for clinical outcome were Constant Score (CS) and Korean Shoulder Score (KSS). RESULTS: The number of cases was 10 in group 1 and 9 in group 2. The strength of FE and Abd were significantly higher in group 1 (p<0.001 and p<0.001, respectively), and the strength of ER was not different significantly between two groups (p=0.065). For the clinical outcome, both CS and KSS were higher in group 1 (p=0.002 and p=0.002, respectively). The number of patients in group A was 11, and group B was 8. Although there was not a significant difference in terms of FE and Abd between group A and B (p=0.091, p=0.238), ER was significantly higher in group A (p=0.012). We did not find a significant difference in the clinical scores (CS, p=0.177 and KSS, p=0.238). CONCLUSIONS: These findings suggest the importance of a preoperative evaluation of the fatty degeneration of deltoid and teres minor muscles for predicting postoperative strength and clinical outcome.
