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Scientific Articles   |    
Analysis of Radial Head Implant Length with Use of Contralateral Elbow Radiographs
George S. Athwal, MD, FRCSC1; Dominique M. Rouleau, MD, MSc, FRCSC2; Joy C. MacDermid, BScPT, MSc, PhD1; Graham J.W. King, MD, MSc, FRCSC1
1 Hand and Upper Limb Centre, St. Joseph's Health Care, University of Western Ontario, 268 Grosvenor Street, London, ON N6A 4L6, Canada. E-mail address for G.S. Athwal: gathwal@uwo.ca
2 University of Montreal, Hôpital Sacré-Coeur, 5400 Boulevard Gouin Ouest, Montreal, QC H4J 1C5, Canada
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Based on an original article: J Bone Joint Surg Am. 2011;93:1339-46.



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.
JBJS Essential Surgical Techniques, 2012 Mar 28;02(01):e6 1-6. doi: 10.2106/JBJS.ST.K.00029
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Extract

Overview
Introduction

This article describes a technique in which measurements are obtained from radiographs of the contralateral, normal elbow to predict the magnitude of overlengthening resulting from use of a metallic radial head prosthesis.

Step 1: Obtain Bilateral Elbow Radiographs

Obtain bilateral digital anteroposterior radiographs of the elbows that are orthogonal to the forearm in 45° of flexion and neutral forearm rotation.

Step 2: Perform Radiographic Measurements of the Contralateral, Normal Elbow

Draw the angle on the radiograph of the normal elbow.

Step 3: Perform Radiographic Measurements of the Radial Head Implant

Draw the same lines and angle and perform the same measurements on the implant radiograph.

Step 4: Calculate Radial Head Implant Length

The virtual length of the native radial head implant (L-NRH) is subtracted from the virtual length of the radial head implant (L-RHI), which results in the magnitude of the radial head implant overlengthening in millimeters: (L-RHI) – (L-NRH) = overlengthening.

Results

The radiographic measurement technique was validated in a cadaveric study.

What to Watch For

Indications

Contraindications

Pitfalls & Challenges

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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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