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Measuring functional outcome after total hip replacement with subject-specific hip joint loading.

Tim Weber¹, Sebastian Dendorfer, Silvia Dullien

¹Department of Orthopedic Surgery, Regensburg University Medical Center, Germany. Tim.Weber@klinik.uni-regensburg.de

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine

|May 3, 2013

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This pilot study demonstrates a method to calculate hip reaction forces during gait after total hip replacement. This offers objective insights into functional outcomes and potential implant wear.

Area of Science:

Orthopedic Surgery
Biomechanics
Gait Analysis

Background:

Total hip replacement (THR) is a common orthopedic procedure with increasing prevalence due to rising life expectancy.
Optimizing functional outcomes in THR requires restoring hip biomechanics as closely as possible to normal.
Understanding the forces acting on hip implants during daily activities like gait is crucial for assessing long-term success.

Purpose of the Study:

To determine the feasibility of computing vectorial hip reaction force pathways and angles on the prosthesis during gait in THR patients.
To establish objective measurements for functional outcomes following total hip replacement.
To provide subject-specific biomechanical data related to implant wear and rim loading.

Main Methods:

Keywords:

Total hip replacement critical hip joint loading cup loading force angles force pathways functional outcome rim loading subject-specific musculoskeletal modeling

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Utilized three-dimensional gait analysis to capture ground reaction forces and kinematics.

Employed a musculoskeletal model to process gait data and compute vectorial joint reaction forces.

Calculated force pathways and force angles (inclination and anteversion) relative to the prosthesis cup during the stance phase.

Main Results:

Demonstrated the ability to compute subject-specific hip reaction force pathways and angles during gait.
Observed distinct force path locations between operated and non-operated hips, and between different subjects.
Force inclination and anteversion angles provided insights into the orientation of forces relative to the implant cup.

Conclusions:

The proposed computational methods can objectively assess functional outcomes in total hip replacement patients.
This approach allows for the determination of applied forces and sliding distances, correlating with wear and rim loading.
Understanding these biomechanical parameters offers insight into the mechanisms acting on the hip joint and can validate improved functional outcomes.