Can we predict which dysplastic hips will require acetabular augmentation during total hip arthroplasty based on pre-operative radiographs?

Marsh, A. G., Nisar, A., El Refai, M., Patil, S. and Meek, R. M. D. (2018) Can we predict which dysplastic hips will require acetabular augmentation during total hip arthroplasty based on pre-operative radiographs? Bone and Joint Journal, 99-B(4), pp. 445-450. (doi: 10.1302/0301-620x.99b4.bjj-2016-0041.r1) (PMID:28385932)

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Abstract

Aims: The purpose of this study was to evaluate whether an innovative templating technique could predict the need for acetabular augmentation during primary total hip arthroplasty for patients with dysplastic hips. Patients and Methods: We developed a simple templating technique to estimate acetabular component coverage at total hip arthroplasty, the True Cup: False Cup (TC:FC) ratio. We reviewed all patients with dysplastic hips who underwent primary total hip arthroplasty between 2005 and 2012. Traditional radiological methods of assessing the degree of acetabular dysplasia (Sharp’s angle, Tönnis angle, centre-edge angle) as well as the TC:FC ratio were measured from the pre-operative radiographs. A comparison of augmented and non-augmented hips was undertaken to determine any difference in pre-operative radiological indices between the two cohorts. The intra- and inter-observer reliability for all radiological indices used in the study were also calculated. Results: Of the 128 cases reviewed, 33 (26%) needed acetabular augmentation. We found no difference in the median Sharp’s angle (p = 0.10), Tönnis angle (p = 0.28), or centre-edge angle (p = 0.07) between the two groups. A lower TC:FC ratio was observed in the augmented group compared with the non-augmented group (median = 0.66 versus 0.88, p < 0.001). Intra-observer reliability was found to be high for all radiological indices analysed (interclass correlation coefficient (ICC) > 0.7). However, inter-observer reliability was more variable and was only high for the TC: FC ratio (ICC > 0.7). Conclusion: The TC: FC ratio gives an accurate estimate of acetabular component coverage. It can help predict which dysplastic hips are likely to need acetabular augmentation at primary total hip arthroplasty. It has high intra- and inter-observer reliability.

Item Type:Articles
Keywords:General Medicine
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Meek, Professor Dominic
Authors: Marsh, A. G., Nisar, A., El Refai, M., Patil, S., and Meek, R. M. D.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:Bone and Joint Journal
Publisher:British Editorial Society of Bone and Joint Surgery
ISSN:2049-4394
ISSN (Online):2049-4408
Published Online:01 April 2017

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