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Bone & Joint Research
Vol. 7, Issue 7 | Pages 440 - 446
1 Jul 2018
Dynamic shear analysis: a novel method to determine mechanical integrity of normal and torn human acetabular labra
Woods AK Broomfield J Monk P Vollrath F Glyn-Jones S
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Objectives

The aim of this study was to investigate the structural integrity of torn and non-torn human acetabular labral tissue.

Methods

A total of 47 human labral specimens were obtained from a biobank. These included 22 torn specimens and 25 control specimens from patients undergoing total hip arthroplasty with macroscopically normal labra. The specimens underwent dynamic shear analysis using a rheometer to measure storage modulus, as an indicator of structural integrity.

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.