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Journal of Orthopaedic Surgery and Research

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Open Access 01-12-2019 | Osteoarthrosis | Research article

Prediction of time to prosthesis implantation as a function of joint anatomy in patients with developmental dysplasia of the hip

Authors: Michael Müller, Anasthasia Rakow, Georgi I. Wassilew, Tobias Winkler, Carsten Perka

Published in: Journal of Orthopaedic Surgery and Research | Issue 1/2019

Abstract

Background

Developmental dysplasia of the hip (DDH) can lead to pain and premature secondary osteoarthritis at an early stage. Joint-preserving osteotomy is an established solution to this problem. In contrast, a conservative approach would result in pain persistence, ultimately raising the patients question for a possible date of expected prosthesis implantation.

The aim of the study was to identify the relationship between the dysplastic hip anatomy and the time of prosthesis implantation in order to enable prognostic predictions in younger patients with symptomatic DDH.

Materials and methods

Data from 129 hips who received THA due to secondary DDH osteoarthritis were evaluated. The preoperative hip anatomy was evaluated for AI and LCE angle. Multiple linear regression analyses were then used to correlate the influence of these parameters with the patient’s age at the time of surgery. In addition, a graphical relationship was derived by the method of power least squares curve fitting with second-degree polynomials.

Results

The mean age for THA was 54.3 ± 11 years. The time of surgery correlated significantly with LCE (0.37) and AI (− 0.3) (p < 0.001). The mean age of patients with LCE angle ≤ 10° was 41.9 ± 14.0 years, for LCE 11–20° 52.7 ± 9.5 years, and for LCE 21–30° 57.0 ± 10.3 years. The following formula could then be determined for the calculation of the potential patient age at the time of THA as a function of LCE angle: age pTHA = 40.2 + 0.8 × LCE angle − 0.01 × (LCE angle)².

Conclusion

A significant correlation between the extent of dysplasia and the time of prosthesis implantation was identified. In particular, the LCE and the AI correlated strongly with the time of implantation. The more dysplastic the angles were, the sooner the THA was necessary. Using the calculations presented in this study, the probable age of prosthesis implantation can be prognosticated and included in a counseling session about treatment options for DDH.

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Title: Prediction of time to prosthesis implantation as a function of joint anatomy in patients with developmental dysplasia of the hip
Authors: Michael Müller
Anasthasia Rakow
Georgi I. Wassilew
Tobias Winkler
Carsten Perka
Publication date: 01-12-2019
Publisher: BioMed Central
Keywords: Osteoarthrosis
Hip Dysplasia
Osteoarthrosis
Hip-TEP
Hip-TEP
Published in: Journal of Orthopaedic Surgery and Research / Issue 1/2019
Electronic ISSN: 1749-799X
DOI: https://doi.org/10.1186/s13018-019-1511-4

At a glance: The STEP trials

Springer Medicine

Prediction of time to prosthesis implantation as a function of joint anatomy in patients with developmental dysplasia of the hip

Abstract

Background

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Materials and methods

Results

Conclusion

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