Influence of femoral anteversion on proximal femoral loading: measurement and simulation in four patients

Citation
Mo. Heller et al., Influence of femoral anteversion on proximal femoral loading: measurement and simulation in four patients, CLIN BIOMEC, 16(8), 2001, pp. 644-649
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Ortopedics, Rehabilitation & Sport Medicine
Journal title
CLINICAL BIOMECHANICS
ISSN journal
0268-0033 → ACNP
Volume
16
Issue
8
Year of publication
2001
Pages
644 - 649
Database
ISI
SICI code
0268-0033(200110)16:8<644:IOFAOP>2.0.ZU;2-Y
Abstract
Objective. The aim of this study was to determine the loading of the proxim al femur during daily activities and to quantify the influence of femoral a nteversion. Design. This study combined experimental and analytical approaches to deter mine the in vivo loading at the hip joint. A numerical musculo-skeletal mod el was validated against measured in vivo hip contact forces and then used to analyse the influence of anteversion on the loading conditions in the fe mur. Background. Musculo-skeletal loading of long bones is essential for joint r eplacement and fracture healing. Although joint contact forces have previou sly been measured in selected patients, the interaction between femoral ant eversion and the associated musculo-skeletal loading environment remains un known. Methods. The gait of four patients with force measuring hip prostheses was analysed during walking and stair-climbing. Musculo-skeletal loading was de termined using individual numerical models by minimising the sum of the mus cle forces. Results. Experimentally and numerically determined hip contact forces agree d both qualitatively and quantitatively. Muscle activity resulted in compre ssion of the femur and small shear forces in the meta- and epi-physeal regi ons. Increasing the anteversion to an angle of 30 degrees increased hip con tact forces and bending moments up to 28%. Conclusions. This study has shown that femoral anteversion has a strong inf luence on the musculo-skeletal loading environment in the proximal femur.