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Archives of Orthopaedic and Trauma Surgery

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01-11-2019 | Orthopaedic Surgery

Radiographic assessment of overlengthening of the MoPyC radial head prosthesis: a cadaveric study

Authors: Marc Schnetzke, Frank Feuchtenhofer, Holger Keil, Benedict Swartman, Sven Vetter, Paul-Alfred Grützner, Jochen Franke

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 11/2019

Abstract

Introduction

The aim of this study was to evaluate a radiographic measurement method for assessment of overlengthening of the MoPyC radial head prosthesis.

Materials and methods

Seven cadaver specimens were studied in ten stages: native specimen (1), radial head resection (2), and implantation of the MoPyC radial head prostheses (Bioprofile, Tornier, Montbonnot-Saint-Martin, France) in four increasing length (correct length, overlengthening of 1.5 mm, 3 mm, and 5 mm) with an intact medial collateral ligament (MCL 3–6) and following transection of the MCL (7–10). The radiographic measurement method according to Athwal et al. was evaluated to detect overlengthening. Statistical analysis included calculation of the diagnostic accuracy of the radiographic method.

Results

The radiographic measurement method correctly determined the size of the radial head prosthesis within ± 1 mm in 224 of 336 scenarios (67%) and within ± 2 mm in 320 of 336 scenarios (95%). With a threshold value of ≥ 1 mm, the overall diagnostic sensitivity for detecting overlengthening when it was present and was 90% and the specificity was 79%. The sensitivity was higher with increasing size of the prosthesis: in cases with overlengthening of 1.5 mm, the sensitivity was 76%, with an overlengthening of 3 mm, the sensitivity was 95%, and with an overlengthening of 5 mm, the sensitivity was 100%.

Conclusion

The radiographic measurement method of Athwal et al. can be used to estimate and to diagnose the magnitude overlengthening of the MoPyC radial head prosthesis. However, the sensitivity is limited (76%) in cases with a small amount of overlengthening of 1.5 mm.

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Title: Radiographic assessment of overlengthening of the MoPyC radial head prosthesis: a cadaveric study
Authors: Marc Schnetzke
Frank Feuchtenhofer
Holger Keil
Benedict Swartman
Sven Vetter
Paul-Alfred Grützner
Jochen Franke
Publication date: 01-11-2019
Publisher: Springer Berlin Heidelberg
Published in: Archives of Orthopaedic and Trauma Surgery / Issue 11/2019
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-019-03187-7

At a glance: The STEP trials

Springer Medicine

Radiographic assessment of overlengthening of the MoPyC radial head prosthesis: a cadaveric study

Abstract

Introduction

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusion

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