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International Orthopaedics

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01-03-2020 | Hip-TEP | Original Article

Acetabular positioning is more consistent with the use of a novel miniature computer-assisted device

Authors: Ivan Jacob, Jessica Benson, Kate Shanaghan, Alejandro Gonzalez Della Valle

Published in: International Orthopaedics | Issue 3/2020

Abstract

Introduction

Computer-assisted surgery (CAS) relying on registration of the anterior pelvic plane (APP) allows precise acetabular component placement. We determined the variability of cup placement in patients who underwent THA with and without the use of CAS that does not rely on the registration of APP.

Methods

Fifty-one patients who underwent staged-bilateral THAs, one without CAS (control), and a subsequent one with CAS (study group), were included. Acetabular inclination and anteversion were measured on standardized post-operative radiographs. Variance in cup position and Lewinnek’s zone proportionality were compared between the groups. Multiple regressions were performed to identify factors affecting variability in acetabular component placement.

Results

The mean inclination for the control and study group was 42.7° (SD 4.5) and 42.5° (SD 2.9), respectively. The inclination variance was 20.5° and 8.2° respectively (p = < 0.001). Cup inclination was more consistent in the study than in the control group (deviation from the mean: 2.3° vs. 3.8°, p < 0.001). The mean anteversion for the control and the study group was 25.5° (SD 7.4) and 26.8° (SD 4.3), respectively. The anteversion variance was 54.2° and 18.2° respectively (p = <0.001). Consistency in cup anteversion was significantly improved with CAS (deviation from the mean: 3.4° vs. 5.8°; p = 0.002). Lewinnek’s zone proportionality was not affected by the use of CAS. In the linear regression analysis, CAS significantly increased consistency in cup inclination (p = 0.01). Patient’s factors including BMI and laterality affected consistency of cup placement.

Conclusion

CAS without referencing the APP allows a more consistent orientation of the acetabular component when compared to freehand placement.

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Title: Acetabular positioning is more consistent with the use of a novel miniature computer-assisted device
Authors: Ivan Jacob
Jessica Benson
Kate Shanaghan
Alejandro Gonzalez Della Valle
Publication date: 01-03-2020
Publisher: Springer Berlin Heidelberg
Keywords: Hip-TEP
Hip-TEP
Published in: International Orthopaedics / Issue 3/2020
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-020-04484-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Acetabular positioning is more consistent with the use of a novel miniature computer-assisted device

Abstract

Introduction

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Introduction

Methods

Results

Conclusion

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