A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating

K. S. Conn; M. T. Clarke; J. P. Hallett

doi:10.1302/0301-620X.84B2.0840269

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General Orthopaedics

A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating

K. S. Conn
M. T. Clarke
J. P. Hallett

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A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating

Conn KS, Clarke MT, Hallett JP. A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating. J Bone Joint Surg Br. 2002;84-B(2):269-272. doi:10.1302/0301-620X.84B2.0840269

Conn, K. S., et al. “A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating.” The Journal of Bone & Joint Surgery British Volume, vol. 84-B, no. 2, 2002, pp. 269-272., https://doi.org/10.1302/0301-620X.84B2.0840269

Conn, K. S., Clarke, M. T., & Hallett, J. P. (2002). A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating. The Journal of Bone & Joint Surgery British Volume, 84-B(2), 269-272. https://doi.org/10.1302/0301-620X.84B2.0840269

Conn, K. S., Clarke, M. T. and Hallett, J. P. (2002) “A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating.” The Journal of Bone & Joint Surgery British Volume, 84-B(2), pp. 269-272. Available at: https://doi.org/10.1302/0301-620X.84B2.0840269

Conn, K. S., M. T. Clarke, and J. P. Hallett. “A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating.” The Journal of Bone & Joint Surgery British Volume 84-B, no. 2 (2002): 269-272. https://doi.org/10.1302/0301-620X.84B2.0840269

Conn KS, Clarke MT, Hallett JP. A simple guide to determine the magnification of radiographs and to improve the accuracy of preoperative templating. J Bone Joint Surg Br. 2002 Mar 1;84-B(2):269-272. https://doi.org/10.1302/0301-620X.84B2.0840269

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Abstract

Templates are used in the preoperative planning of many orthopaedic procedures. The magnification of the bones on preoperative radiographs can vary despite using standardised radiological techniques. Templates will give misleading measurements unless this magnification is quantified.

A coin may be used to calculate the magnification, with significant improvement in the accuracy of templating (p = 0.05). A group of patients undergoing uncemented arthroplasty of the hip was at high risk for intraoperative fracture of the femur because the magnification of the radiograph was larger than that of the template.

Correspondence should be sent to Mr K. S. Conn at the Department of Orthopaedic Surgery, North Hampshire Hospitals NHS Trust, Aldermaston Road, Basingstoke, Hampshire RG24 9NA, UK.

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