The effects of impingement and dysplasia on stress distributions in the hip joint during sitting and walking: a finite element analysis

Chegini, S; Beck, M; Ferguson, SJ (2009). The effects of impingement and dysplasia on stress distributions in the hip joint during sitting and walking: a finite element analysis. Journal of orthopaedic research, 27(2), pp. 195-201. Hoboken, N.J.: Wiley 10.1002/jor.20747

Full text not available from this repository. (Request a copy)

Soft tissue damage has been observed in hip joints with pathological geometries. Our primary goal was to study the relationship between morphological variations of the bony components of the hip and resultant stresses within the soft tissues of the joint during routine daily activities. The secondary goal was to find the range of morphological parameters in which stresses are minimized. Computational models of normal and pathological joints were developed based on variations of morphological parameters of the femoral head (Alpha angle) and acetabulum (CE angle). The Alpha angle was varied between 40 degrees (normal joint) and 80 degrees (cam joint). The CE angle was varied between 0 degrees (dysplastic joint) and 40 degrees (pincer joint). Dynamic loads and motions for walking and standing to sitting were applied to all joint configurations. Contact pressures and stresses were calculated and crosscompared to evaluate the influence of morphology. The stresses in the soft tissues depended strongly on the head and acetabular geometry. For the dysplastic joint, walking produced high acetabular rim stresses. Conversely, for impinging joints, standing-to-sitting activities that involved extensive motion were critical, inducing excessive distortion and shearing of the tissue-bone interface. Zones with high von Mises stresses corresponded with clinically observed damage zones in the acetabular cartilage and labrum. Hip joint morphological parameters that minimized were 20 degrees <or= CE <or= 30 degrees and alpha <or= 50 degrees .

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Chegini, Salman; Beck, Martin and Ferguson, Stephen John

ISSN:

0736-0266

ISBN:

18752280

Publisher:

Wiley

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 15:09

Last Modified:

06 Dec 2013 13:56

Publisher DOI:

10.1002/jor.20747

PubMed ID:

18752280

Web of Science ID:

000262533300009

URI:

https://boris.unibe.ch/id/eprint/30384 (FactScience: 193054)

Actions (login required)

Edit item Edit item
Provide Feedback