Impact of the Femoral Head Position on Moment Arms in Total Hip Arthroplasty: A Parametric Finite Element Study.

Détails

ID Serval
serval:BIB_1EA0CC7AC77A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Impact of the Femoral Head Position on Moment Arms in Total Hip Arthroplasty: A Parametric Finite Element Study.
Périodique
Journal of Arthroplasty
Auteur(s)
Rüdiger H.A., Parvex V., Terrier A.
ISSN
1532-8406 (Electronic)
ISSN-L
0883-5403
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
31
Numéro
3
Pages
715-720
Langue
anglais
Résumé
BACKGROUND: Although the importance of accurate femoral reconstruction to achieve a good functional outcome is well documented, quantitative data on the effects of a displacement of the femoral center of rotation on moment arms are scarce. The purpose of this study was to calculate moment arms after nonanatomical femoral reconstruction.
METHODS: Finite element models of 15 patients including the pelvis, the femur, and the gluteal muscles were developed. Moment arms were calculated within the native anatomy and compared to distinct displacement of the femoral center of rotation (leg lengthening of 10 mm, loss of femoral offset of 20%, anteversion ±10°, and fixed anteversion at 15°). Calculations were performed within the range of motion observed during a normal gait cycle.
RESULTS: Although with all evaluated displacements of the femoral center of rotation, the abductor moment arm remained positive, some fibers initially contributing to extension became antagonists (flexors) and vice versa. A loss of 20% of femoral offset led to an average decrease of 15% of abductor moment. Femoral lengthening and changes in femoral anteversion (±10°, fixed at 15°) led to minimal changes in abductor moment arms (maximum change of 5%). Native femoral anteversion correlated with the changes in moment arms induced by the 5 variations of reconstruction.
CONCLUSION: Accurate reconstruction of offset is important to maintaining abductor moment arms, while changes of femoral rotation had minimal effects. Patients with larger native femoral anteversion appear to be more susceptible to femoral head displacements.
Pubmed
Web of science
Création de la notice
22/03/2016 15:20
Dernière modification de la notice
20/08/2019 12:54
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