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Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 5, 581-585.
doi: 10.1302/0301-620X.88B5.17184  
Copyright © 2006 by British Editorial Society of Bone and Joint Surgery
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Assessment of reproducibility and accuracy in templating hybrid total hip arthroplasty using digital radiographs

M. J. Oddy, MSc, MRCS, Specialist Registrar1; M. J. Jones, MB BS, BSc, Senior House Officer1; C. J. Pendegrass, PhD, Research Fellow2; J. R. Pilling, FRCR, Consultant Radiologist1; and J. A. Wimhurst, MChir, FRCS(Tr & Orth), Consultant Orthopaedic Surgeon1

1 Department of Orthopaedics, The Norfolk and Norwich University Hospital NHS Trust, Colney Lane, Norwich, Norfolk NR4 7UZ, UK.
2 The Centre for Biomedical Engineering, Institute of Orthopaedics and Musculoskeletal Science, Royal National Orthopaedic Hospital, Stanmore, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.

Correspondence should be sent to Mr M. J. Oddy; e-mail: Mjoddy9{at}aol.com

In 20 patients undergoing hybrid total hip arthroplasty, the reproducibility and accuracy of templating using digital radiographs were assessed. Digital images were manipulated using either a ten-pence coin as a marker to scale for magnification, or two digital-line methods using computer software. On-screen images were templated with standard acetate templates and compared with templating performed on hard-copy digital prints.

The digital-line methods were the least reliable and accuracy of sizing compared with the inserted prostheses varied between –1.6% and +10.2%. The hard-copy radiographs showed better reproducibility than the ten-pence coin method, but were less accurate with 3.7% undersizing. The ten-pence coin method was the most accurate, with no significant differences for offset or acetabulum, and undersizing of only 0.9%.

On-screen templating of digital radiographs with standard acetate templates is accurate and reproducible if a radiopaque marker such as a ten-pence coin is included when the original radiograph is taken.




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Registered charity no: 209299     Print ISSN: 0301-620X
Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General