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Clin Shoulder Elb > Volume 18(3); 2015 > Article
Clinics in Shoulder and Elbow 2015;18(3):138-143.
DOI:    Published online September 30, 2015.
Effect of Preoperative Fatty Degeneration of the Deltoid and the Teres Minor Muscles on the Clinical Outcome after Reverse Total Shoulder Arthroplasty
Sung Hoon Moon, Woo Dong Nam, Chang Hyun Rheu, Jae Woo Lee
Department of Orthopedic Surgery, Kangwon National University School of Medicine, Chuncheon, Korea.
Received: 17 November 2014   • Revised: 26 May 2015   • Accepted: 28 May 2015
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).
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).
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).
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.
Key Words: Massive rotator cuff tear; Cuff tear arthropathy; Reverse total shoulder arthroplasty; Deltoid fatty degeneration; Teres minor fatty degeneration
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