Objectives
Pseudotumours (abnormal peri-prosthetic soft-tissue reactions)
following metal-on-metal hip resurfacing arthroplasty (MoMHRA) have
been associated with elevated metal ion levels, suggesting that
excessive wear may occur due to edge-loading of these MoM implants.
This study aimed to quantify in vivo edge-loading
in MoMHRA patients with and without pseudotumours during functional
activities.
Methods
The duration and magnitude of edge-loading in vivo was
quantified during functional activities by combining the dynamic
hip joint segment contact force calculated from the three-dimensional
(3D) motion analysis system with the 3D reconstruction of orientation
of the acetabular component and each patient’s specific hip joint
centre, based on CT scans.
