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Related Experiment Video

Updated: Jun 13, 2026

Rat Model of Adhesive Capsulitis of the Shoulder

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Published on: September 28, 2018

Is external rotation the correct immobilisation for acute shoulder dislocation? An MRI study.

J Siegler¹, J Proust, P S M Marcheix

¹Orthopedics and Traumatology Department, Dupuytren University Hospital, Limoges, France. juliensiegler@yahoo.fr

Orthopaedics & Traumatology, Surgery & Research : OTSR

|May 18, 2010

Summary

External rotation (ER) immobilization after primary shoulder dislocation helps reduce labral lesions and anterior capsule volume. This MRI study confirms ER

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Area of Science:

Orthopedic Surgery
Radiology
Sports Medicine

Background:

Anterior shoulder dislocation is common and frequently recurs.
Immobilization in external rotation (ER) is suggested to improve outcomes, but evidence is limited.
The impact of ER on labral and capsular injuries requires further investigation.

Purpose of the Study:

To evaluate the effect of external rotation (ER) on labral and capsular ligamentous complex lesions after primary shoulder dislocation using MRI.
To assess the reduction of hemarthrosis, labral displacement, and anterior capsule volume in ER.

Main Methods:

Prospective MRI study of 23 patients with acute anteromedial shoulder dislocation.
MRI protocol included acquisitions in both internal and external rotation.
Analysis of hemarthrosis, ER amplitude, rotator cuff, bone lesions, and labral lesions (Habermeyer's classification, Itoi criteria).

Main Results:

External rotation (ER) modified hemarthrosis distribution in 75% of cases.
All labral lesions showed reduction in ER, with 21% complete reduction.
Anterior joint effusion was reduced in ER, indicating potential for reduced recurrence factors.

Conclusions:

External rotation (ER) systematically reduces labral separation and anterior capsule volume, key factors in shoulder instability.
ER demonstrated a positive effect on hemarthrosis, anterior capsule detachment, and labral lesions.
Further long-term clinical studies are needed to confirm the efficacy of ER immobilization for preventing shoulder instability.