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Digital templating without a calibration marker is accurate at predicting implant size for hip hemiarthroplasty

  • Mina Derias
  • Muhammad A. Khan
  • Jamie Buchanan
Original Article
  • 15 Downloads

Abstract

Introduction

This study aims to assess the accuracy of digital templating for hip hemiarthroplasty using radiographs without calibration.

Methods

Two independent, blinded observers retrospectively utilised digital software to template 50 consecutive patients who had hip hemiarthroplasty. The templated parameters (head size, offset and stem size) derived from pre-operative radiographs were compared to the actual prosthetic sizes used intra-operatively. Inter and intra-observer variabilities were calculated.

Results

Both observers correctly templated the offset and head size (± 2 mm) used in 90% (n = 45) of cases. The femoral stem size (± 1 size) was correctly predicted by templating in over 84% of the cases (n = 42). Inter-observer agreement was excellent for femoral head size with an intra-class correlation coefficients (ICC) of 0.94, substantial for offset (k = 0.7) but only fair for stem size (k = 0.27). ICC values comparing the actual prostheses inserted with the template values were excellent for head size (ICC = 0.96), substantial to near perfect for offset (k = 0.78, 0.85) and fair to moderate (k = 0.24, 0.45) for stem size.

Conclusion

Digital templating of radiographs without calibration can be used to accurately and reliably predict femoral head size and offset at a set magnification of 120%. Femoral stem size, however, is more difficult to template adequately on pre-operative radiographs without calibration.

Keywords

Digital templating Magnification Calibration Trauma Hemiarthroplasty Hip fracture 

Notes

Acknowledgements

This research was undertaken as part of the third year of the Masters in Surgical Sciences in partnership with the University of Edinburgh and the Royal College of Surgeons of Edinburgh ‘http://www.essq.rcsed.ac.uk’.

Compliance with ethical standards

Conflict of interest

Mr. Derias has nothing to disclose. Mr. Khan has nothing to disclose. Mr. Buchanan has nothing to disclose.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Trauma and OrthopaedicsConquest HospitalSaint Leonards-on-SeaUK

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