2017 ISAKOS Biennial Congress Paper #94

The Relationships of Acromion Index and Critical Shoulder Angle in Korean Patients with Rotator Cuff Tear

Kyoung-Jin Park, MD, PhD, Cheongju, Chungbuk KOREA, REPUBLIC OF
Yong-Min Kim, MD, Cheongju, Chungbuk KOREA, REPUBLIC OF
Byung-Ki Cho, MD, Cheongju, Chungbuk KOREA, REPUBLIC OF
Donghwan Kim, MD, Cheongju, Chungbuk KOREA, REPUBLIC OF
Jae Young Yang, Cheongju, Province: Chungbuk KOREA, REPUBLIC OF

Department of Orthopaedic Surgery, College of Medicine, Chungbuk National University, Cheongju , Chungbuk , KOREA, REPUBLIC OF

FDA Status Not Applicable

Summary

AI showed significant correlations with rotator cuff tear in the full-thickness tear and cuff tear arthropathy groups. CSA has no correlation with full-thickness tear but correlation with cuff tear arthropathy.

Abstract

Introduction

There are some reports that rotator cuff tears have relationship with acromion index (AI) and critical shoulder angle (CSA). But some authors report that they don’t have relationship. So we want to know the relationships of AI and CSA in Korean patients with rotator cuff tear(RCT).

Methods

Total 279 cases confirmed by magnetic resonance imaging (MRI) were divided into 4 groups including 99 normal cases without rotator cuff tear, 50 cases with rotator cuff partial tear, 100 cases with full-thickness rotator cuff tear, and 30 cases with cuff tear arthropathy. In true anterior–posterior X-rays, AI and CSA were measured respectively, and their interrelationship was compared and statistically analyzed with ANOVA.

Results

The average AI were normal group 0.65(0.38-0.85, ±0.09), partial tear group 0.68(0.54-0.86, ±0.08), full-thickness tear group 0.677(0.46-0.88, ±0.08), and cuff tear arthropathy group 0.72(0.55-0.91, ±0.09), and averages of each CSA were normal group 33.27(16.40-44.50, ±4.93), partial tear group 34.46(24.10-48.50, ±5.05), full-thickness tear group 34.05(23.30-45.40, ±4.65), and cuff tear arthropathy group 35.84(27.10-48.30, ±4.87). AI were significantly different in the normal, partial tear, full-thickness tear, and cuff tear arthropathy groups (P<0.015 , P<0.025, and P<0.015). CSA was not significantly different in the normal, partial tear, and full-thickness tear groups (P>0.172 and P>0.250), but significantly different in the cuff tear arthropathy group (P<0.012).

Conclusion

AI showed significant correlations with rotator cuff tear in the full-thickness tear and cuff tear arthropathy groups. CSA has no correlation with full-thickness tear but correlation with cuff tear arthropathy. Additional studies could be needed in the future.