Subject-specific musculoskeletal modelling in patients before and after total hip arthroplasty^*

* All work was conducted at KU Leuven.

Abstract

The goal of this study was to define the effect on hip contact forces of including subject-specific moment generating capacity in the musculoskeletal model by scaling isometric muscle strength and by including geometrical information in control subjects, hip osteoarthritis and total hip arthroplasty patients. Scaling based on dynamometer measurements decreased the strength of all flexor and abductor muscles. This resulted in a model that lacked the capacity to generate joint moments required during functional activities. Scaling muscle forces based on functional activities and inclusion of MRI-based geometrical detail did not compromise the model strength and resulted in hip contact forces comparable to previously reported measured contact forces.

Keywords:

• Musculoskeletal modelling
• patient-specific modelling
• imaging
• moment generating capacity
• hip osteoarthritis
• total hip arthroplasty

Acknowledgement

The support of the Agency for Innovation by Science and Technology (IWT-TBM No. 100786) is gratefully acknowledged. The funders had no role in any part of this study.

Notes

* All work was conducted at KU Leuven.