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Scientific Articles   |    
Quantification of Humeral Head Deformity Following Neonatal Brachial Plexus Palsy
Brenton D. Reading, MD1; Tal Laor, MD1; Shelia R. Salisbury, PhD1; William C. Lippert, MPH1; Roger Cornwall, MD1
1 Department of Radiology (B.D.R. and T.L.), Division of Biostatistics and Epidemiology (S.R.S.), and Division of Pediatric Orthopaedic Surgery (R.C. and W.C.L.), Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229. E-mail address for T. Laor: tal.laor@cchmc.org
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Investigation performed at the Department of Radiology, the Division of Biostatistics and Epidemiology, and the Division of Pediatric Orthopaedic Surgery, Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, Ohio



Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Copyright © 2012 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2012 Sep 19;94(18):e136 1-8. doi: 10.2106/JBJS.K.00540
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Abstract

Update 

This article was updated on December 27, 2012, because of a previous error. In the Statistical Analyses of MR Imaging Examinations section and in the Table E-2 headings, the word “kappa” has been replaced with “intraclass correlation coefficient.”

Background: 

Neonatal brachial plexus palsy frequently leads to glenohumeral dysplasia if neurological recovery is incomplete. Although glenoid retroversion and glenohumeral subluxation have been well characterized, humeral head deformity has not previously been quantified. Nonetheless, humeral head flattening is described as a contraindication to joint contracture release and external rotation tendon transfers. This study describes a novel technique for objectively quantifying humeral head deformity with use of magnetic resonance (MR) imaging and correlates the humeral head deformity with clinical and radiographic outcomes following joint rebalancing surgery.

Methods: 

Magnetic resonance images of thirty-two children (age, 0.7 to 11.5 years) with neonatal brachial plexus palsy were retrospectively reviewed. Passive shoulder external rotation and Mallet scores were reviewed before joint rebalancing surgery and at a minimum clinical follow-up interval of two years. The humeral head skewness ratio on preoperative and postoperative axial MR images was defined as the ratio of anterior to posterior humeral head area, and this ratio was compared between affected and unaffected shoulders and with the glenoid version angle, posterior subluxation of the humeral head, and clinical parameters before and after surgery with use of paired t tests and Spearman correlation. Intraobserver and interobserver reliability of MR image measurements was determined.

Results: 

Measurements of the skewness ratio on the affected side had moderate to substantial intraobserver reliability (0.53 to 0.72) and substantial interobserver reliability (0.65 to 0.71). Preoperatively, the skewness ratio of the affected humeral head (mean, 0.76; range, 0.54 to 1.03) differed significantly from the ratio in the contralateral shoulder (p < 0.05) and was significantly associated with the glenoid version angle (p < 0.05) and posterior subluxation of the humeral head (p < 0.05). Remodeling of the affected humeral head was observed postoperatively, with a significant improvement in the skewness ratio (p < 0.05). However, there were no significant correlations between the preoperative skewness ratio and postoperative clinical outcomes.

Conclusions: 

Humeral head deformity in neonatal brachial plexus palsy correlated with other measures of glenohumeral dysplasia and could be reliably and objectively quantified on MR imaging with use of the skewness ratio. The humeral head deformity can remodel following joint rebalancing surgery, and such a deformity alone does not preclude a successful outcome after surgical attempts to restore glenohumeral congruity.

Level of Evidence: 

Diagnostic Level IV. See Instructions for Authors for a complete description of levels of evidence.

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    References

    Accreditation Statement
    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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