Anthropometric method for estimating component sizes in total hip arthroplasty

doi:10.5312/wjo.v12.i11.859

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World Journal of Orthopedics

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Retrospective Study

World J Orthop. Nov 18, 2021; 12(11): 859-866
Published online Nov 18, 2021. doi: 10.5312/wjo.v12.i11.859

Anthropometric method for estimating component sizes in total hip arthroplasty

Rajpreet Sahemey, Thomas S Moores, Hannah Meacher, Bishoy Youssef, Shehzaad Khan, Christopher R Evans

Rajpreet Sahemey, Department of Trauma and Orthopaedics, University Hospitals Coventry and Warwickshire, Coventry CV2 2DX, United Kingdom

Thomas S Moores, Department of Trauma and Orthopaedics, Walsall Manor Hospital, Walsall WS2 9PS, United Kingdom

Hannah Meacher, Bishoy Youssef, Department of Trauma and Orthopaedics, Royal Stoke University Hospital, Stoke-on-Trent ST4 6QG, United Kingdom

Shehzaad Khan, Department of Trauma and Orthopaedics, Royal National Orthopaedic Hospital, Stanmore HA7 4LP, United Kingdom

Christopher R Evans, Department of Orthopaedics, The Robert Jones and Agnes Hunt Orthopaedic Hospital, Oswestry SY10 7AG, United Kingdom

Author contributions: Sahemey R, Moores TS, Youssef B, Khan S and Evans CR designed and coordinated the study; Sahemey R, Moores TS, Meacher H and Khan S performed the experiments, acquired and analysed the data; Sahemey R and Moores TS wrote the manuscript; all authors approved the final version of this article.

Institutional review board statement: Institutional Review Board approval was not required in accordance with National Research Ethics Service (United Kingdom) guidance on the use of anonymised data collected retrospectively as part of routine clinical care.

Informed consent statement: Informed consent was waived. This retrospective study involves no more than minimal risk to the participants.

Conflict-of-interest statement: The authors declare that there are no conflicts of interest relevant to this article.

Data sharing statement: No additional data are available.

Corresponding author: Rajpreet Sahemey, BSc, MBBS, Surgeon, Department of Trauma and Orthopaedics, University Hospitals Coventry and Warwickshire, UHCW, Clifford Bridge Road, Coventry CV2 2DX, United Kingdom. rajpreet.s@gmail.com

Received: May 26, 2021
Peer-review started: May 26, 2021
First decision: July 27, 2021
Revised: August 14, 2021
Accepted: September 15, 2021
Article in press: September 15, 2021
Published online: November 18, 2021
Processing time: 173 Days and 4.4 Hours

ARTICLE HIGHLIGHTS

Research background

Preoperative templating is an essential in total hip arthroplasty (THA) as the correct size and orientation of components play a key role in the success of the prosthesis. Templating is becoming digitised yet many orthopaedic departments lack access to software due to cost and resources.

Research motivation

Available evidence surrounding the correlation between a patient’s shoe size and knee arthroplasty component sizes suggests reliable positive correlations. Our motivation for this study was to assess if there was a reliable anthropometric method to predict THA component sizes from shoe size in the absence of digital methods.

Research objectives

We aim to determine the accuracy of using an easily obtainable measurement (shoe size) to predict component sizes in THA when compared with the digitally templated sizes of the same hip.

Research methods

We performed a retrospective review of 102 patients (40 male, 62 female) who had undergone elective uncemented or hybrid THA at our single centre. Standardised digital pelvic radiographs were retrospectively templated to desired cup and stem sizes using TraumaCad^®. We then compared the templated size to the actual size of the implant that the patient received and assessed if there was any correlation with the patient’s shoe size.

Research results

Statistically significant positive correlations were observed between patient shoe size: templated cup and implanted cup size; templated stem and implanted stem size. Positive correlations were also demonstrated between templated and implanted acetabular cup sizes, and templated and implanted stem sizes.

Research conclusions

Our study has shown there to be strong positive correlations between shoe size and templated component sizes in primary uncemented THA. Shoe size is an easily obtainable measurement and can allow surgeons to confidently predict component sizes in the absence of digital templating.

Research perspectives

Future research should evaluate the clinical significance of these findings with cemented hip systems.