Journal article
Joint contact stress improves in dysplastic hips after periacetabular osteotomy but remains higher than in normal hips
Hip international, Vol.33(2), pp.298-305
03/2023
DOI: 10.1177/11207000211036414
PMCID: PMC9744023
PMID: 34348517
Abstract
Aim: The purpose of this study was to use computational modeling to determine if surgical correction of hip dysplasia restores hip contact mechanics to those of asymptomatic, radiographically normal hips. Methods: Discrete element analysis (DEA) was used to compute joint contact stresses during the stance phase of normal walking gait for 10 individuals with radiographically normal, asymptomatic hips and 10 age- and weight-matched patients with acetabular dysplasia who underwent periacetabular osteotomy (PAO). Results: Mean and peak contact stresses were higher (p < 0.001 and p = 0.036, respectively) in the dysplastic hips than in the matched normal hips. PAO normalised standard radiographic measurements and medialised the location of computed contact stress within the joint. Mean contact stress computed in dysplastic hips throughout the stance phase of gait (median 5.5 MPa, [IQR 3.9-6.1 MPa]) did not significantly decrease after PAO (3.7 MPa, [IQR 3.2-4.8]; p = 0.109) and remained significantly (p < 0.001) elevated compared to radiographically normal hips (2.4 MPa, [IQR 2.2-2.8 MPa]). Peak contact stress demonstrated a similar trend. Joint contact area during the stance phase of gait in the dysplastic hips increased significantly (p = 0.036) after PAO from 395 mm(2) (IQR 378-496 mm(2)) to 595 mm(2) (IQR 474-660 mm(2)), but remained significantly smaller (p = 0.001) than that for radiographically normal hips (median 1120 mm(2), IQR 853-1444 mm(2)). Conclusions: While contact mechanics in dysplastic hips more closely resembled those of normal hips after PAO, the elevated contact stresses and smaller contact areas remaining after PAO indicate ongoing mechanical abnormalities should be expected even after radiographically successful surgical correction.
Details
- Title: Subtitle
- Joint contact stress improves in dysplastic hips after periacetabular osteotomy but remains higher than in normal hips
- Creators
- Jessica E. Goetz - University of IowaHolly D. Thomas-Aitken - University of IowaSean E. Sitton - University of IowaRobert W. Westermann - University of IowaMichael C. Willey - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Hip international, Vol.33(2), pp.298-305
- DOI
- 10.1177/11207000211036414
- PMID
- 34348517
- PMCID
- PMC9744023
- NLM abbreviation
- Hip Int
- ISSN
- 1120-7000
- eISSN
- 1724-6067
- Publisher
- Sage
- Number of pages
- 8
- Grant note
- P50 AR 055533 / National Institute of Arthritis and Musculoskeletal and Skin Disease of the National Institutes of Health Orthopaedic Research and Education Foundation
- Language
- English
- Electronic publication date
- 08/05/2021
- Date published
- 03/2023
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Orthopedics and Rehabilitation; Injury Prevention Research Center; Athletic Training Program
- Record Identifier
- 9984303988002771
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