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J Shoulder Elbow Surg. 2013 Aug;22(8):1078-83. doi: 10.1016/j.jse.2012.10.036. Epub 2013 Jan 22.

Magnetic resonance scanning vs axillary radiography in the assessment of glenoid version for osteoarthritis.

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  • 1Department of Trauma and Orthopaedic Surgery, Bristol Royal Infirmary, Bristol, UK. ac_raymond@hotmail.co.uk

Abstract

BACKGROUND:

Osteoarthritic shoulders are mainly associated with glenoid retroversion. Total shoulder arthroplasty with the glenoid component implanted in retroversion predisposes to loosening of the glenoid prosthesis. Correction of glenoid retroversion through anterior eccentric reaming, before glenoid component implantation, is performed to restore normal joint biomechanics. Accurate preoperative assessment is required to ascertain the degree of retroversion and calculate the degree of reaming.

MATERIALS AND METHODS:

We assessed the utility of magnetic resonance imaging (MRI) for the assessment of glenoid version in glenohumeral osteoarthritis compared with standard plain axillary radiography (AXR). Two independent observers reviewed both types of imaging in 48 primary osteoarthritic shoulders on 2 separate occasions.

RESULTS:

The mean glenoid version measured was -14.3° on MRI and -21.6° on AXR (mean difference, -7.36°; P < .001). Intraobserver and interobserver reliability coefficients were 0.96 and 0.9, respectively, for MRI and 0.8 and 0.71, respectively, for AXR. Glenoid retroversion was greater in 73% of AXR.

CONCLUSION:

We demonstrated that MRI is more reproducible in the assessment of glenoid version in osteoarthritis and provides excellent intraobserver and interobserver reliability. MRI is useful for preoperative osseous imaging for total shoulder arthroplasty because it offers a more precise method of determining glenoid version compared with x-ray imaging in addition to the standard assessment of rotator cuff integrity.

Copyright © 2013 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Mosby, Inc. All rights reserved.

KEYWORDS:

Diagnostic Study; Glenoid version; Level III; MRI; axillary radiography; glenohumeral osteoarthritis; shoulder magnetic resonance imaging

PMID:
23352056
[PubMed - indexed for MEDLINE]
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