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Bone & Joint Research
Vol. 1, Issue 4 | Pages 42 - 49
1 Apr 2012
In vivo evaluation of edge-loading in metal-on-metal hip resurfacing patients with pseudotumours
Kwon Y Mellon SJ Monk P Murray DW Gill HS
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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.