Purpose: To evaluate and describe the findings of immediate postoperative magnetic resonance
(MR) arthrography of repaired capsulolabral buttress using 2 different arm positions
(internal rotation and external rotation) for patients who have undergone arthroscopic
Bankart repair. Type of Study: Case series. Methods: Arthroscopically repaired Bankart lesions in 22 nonconsecutive patients were examined
with axial T2-weighted MR arthrography. We studied each of the 22 shoulders on the
day of surgery for each patient. We measured 3 parameters (height, slope, and medial
overhang) on the axial image at the anteroinferior portion of the glenoid (near the
most inferior anchor) while placing each patient’s arm into 2 different positions.
The first involved internal rotation and the second, external rotation of the shoulder
with the arm held at the side of the trunk and the elbow at 90° flexion. The mean
internal rotation of the arm was 30° (range, 14° to 45°) and the mean external rotation
was 19° (range, 2° to 44°). Results: The mean labral height and slope differences between the 2 arm positions were 1.47
mm (standard deviation [SD], 0.75 mm; range, 0.6 mm to 3.5 mm; P < .001) and 6.91° (SD, 3.4°; range, 2.2° to 11.2°; P < .001), respectively. Medial overhang on the glenoid rim was 81% positive with the
arm at internal rotation whereas medial overhang was 86% negative with the arm at
external rotation (P < .001). On MR arthrography, internal rotation of shoulder showed the loss of the
capsulolabral buttress in all patients. Conclusions: On MR arthrography, the arthroscopically repaired capsulolabral buttress was affected
by rotation of the arm after Bankart repair. Internal rotation of the arm significantly
decreased our ability to see the repaired capsulolabral buttress on MR arthrography.
Level of Evidence: Level III, diagnostic study of nonconsecutive patients.
Key Words
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© 2005 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
