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Position of Immobilization After Dislocation of the Glenohumeral Joint A Study with Use of Magnetic Resonance Imaging
Eiji Itoi, MD; Ryuji Sashi, MD; Hiroshi Minagawa, MD; Togo Shimizu, MD; Ikuko Wakabayashi, MD; Kozo Sato, MD
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Investigation performed at the Departments of Orthopedic Surgery and Radiology, Akita University School of Medicine, Akita, Japan
Eiji Itoi, MD Ryuji Sashi, MD Togo Shimizu, MD Ikuko Wakabayashi, MD Kozo Sato, MD Departments of Orthopedic Surgery (E.I., T.S., I.W., and K.S.) and Radiology (R.S.), Akita University School of Medicine, Hondo 1-1-1, Akita 010-8543, Japan. E-mail address for E. Itoi: itoi@med.akita-u.ac.jp
Hiroshi Minagawa, MD Department of Orthopedic Surgery, Ugo Municipal Hospital, Ugo-machi, Ogachi-gun 012-1131, Japan
No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.
A commentary is available with the electronic versions of this article, on our web site (www.jbjs.org) and on our CD-ROM (call 781-449-9780, ext. 140, to order).

J Bone Joint Surg Am, 2001 May 01;83(5):661-667
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Background: Glenohumeral dislocations often recur, probably because a Bankart lesion does not heal sufficiently during the period of immobilization. Using magnetic resonance imaging, we assessed the position of the Bankart lesion, with the arm in internal and external rotation, in shoulders that had had a dislocation.

Methods: Coaptation of a Bankart lesion was examined with use of magnetic resonance imaging, with the arm held at the side of the trunk and positioned first in internal rotation (mean, 29°) and then in external rotation (mean, 35°), in nineteen shoulders. Six shoulders (six patients) had had an initial anterior dislocation, and thirteen shoulders (twelve patients) had had recurrent anterior dislocation. Fast-spin-echo T2-weighted axial images were made when the dislocation had occurred less than two weeks earlier, and spin-echo T1-weighted axial images after intra-articular injection of gadolinium-diethylenetriamine pentaacetic acid were made when the dislocation had occurred more than two weeks earlier. Separation and displacement of the anteroinferior portion of the labrum from the glenoid rim were measured on the axial images, and coaptation of the anterior part of the capsule to the glenoid neck was assessed by measurement of the detached area, opening angle, and detached length.

Results: Separation and displacement of the labrum were both significantly less (p = 0.0047 and p = 0.0017, respectively) when the arm was in external rotation than when it was in internal rotation. The detached area and the opening angle of the anteroinferior portion of the capsule were both significantly smaller (p = 0.0003 and p < 0.0001, respectively), and the detached length was significantly shorter (p < 0.0001) with the arm in external rotation.

Conclusion: Immobilization of the arm in external rotation better approximates the Bankart lesion to the glenoid neck than does the conventional position of internal rotation.

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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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