| Acromial Morphology in Different MR Oblique Sagittal Slices: Correlation with Rotator Cuff Disorder |
| Chris H Jo, Ji Beom Kim, Hye Yeon Choi, Young Whan Ko, Kang Sup Yoon, Ji Ho Lee, Seung Baik Kang, Jae Hyup Lee, Hyuk Soo Han, Seung Whan Rhee |
1Department of Orthopedic Surgery, Seoul National University Boramae Hospital, Seoul, Korea. chrisjo@snu.ac.kr
2Department of Radiology, Seoul National University Boramae Hospital, Seoul, Korea. |
| 자기 공명 영상의 사 시상면에서의 견봉 형태의 변화: 회전근 개 질환과의 임상적 연관성 분석 |
| 조현철·김지범·최혜연·고영환*·윤강섭·이지호·강승백·이재협·한혁수·이승환 |
| 서울대학교 보라매병원 정형외과, 서울대학교 보라매병원 영상의학과* |
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| Abstract |
PURPOSE
On the hypothesis that the acromion morphology is changed according to the its site, we identified the morphology of the acromion on the oblique slices of MRI and we investigated the association of the acromial shape with the clinical stages of rotator cuff disorder on the magnetic resonance (MR) images. In addition, we compared the acromion morphology on MRI and simple X-rays.
MATERIAL AND METHODS: The MR images of seventy one patients with rotator cuff disorder and who underwent arthroscopic surgery were compared with that of a control group of sixteen patients who didn't have rotator cuff disorder on MRI. On three subsequent oblique sagittal slices from the lateral edge of the acromion (S1, S2 and S3), each acromion morphology on the MRI slices was classified according to Epstein et al: flat, curved or hooked. We investigated the changing parttern of the acromion shape and we compared the acromion shape on MRI and that on simple X-rays. We classified the rotator cuff tear by the severity: bursitis, partial thickness tear or full thickness tear. We investigated which acromial type on the MRI oblique slice was associated with the severity of rotator cuff disease.
RESULTS
Changes of the acromial shape occurred in 54 patients (76.1%). The most frequent pattern was that the types are same on S1 and S2 and different on S3 (22 cases, 31.0%). The acromial type on S1 and S2 was significantly associated with the severity of rotator cuff disorder (p=0.001 and 0.022), respectively. There was no reliability of the acromial shape on MRI and roentgenography (p>0.05).
CONCLUSION
The type of acromion changed from lateral to medial. Among the three positions, the shape of the acromion on S1 and S2 had meaningful correlation with the clinical stage of rotator cuff disorder. There was no statistical correlation of the acromial shape between MRI and simple X-ray. |
| Key Words:
Shoulder; Acromion; Rotator cuff disorder; Magnetic resonance image |
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