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Orthopaedic Proceedings
Vol. 102-B, Issue SUPP_5 | Pages 32 - 32
1 Jul 2020
WHAT IS THE EFFECT OF A MARATHON ON THE PELVIS AND HIPS? AN MRI STUDY OF 44 RUNNERS
Horga L Henckel J Fotiadou A Laura AD Hirschmann A Hart A
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Background

Over 30 million people run marathons annually. The impact of marathon running on hips is unclear with existing literature being extremely limited (only one study of 8 runners).

Aim and Objectives

We aimed to better understand the effect of marathon running on the pelvis and hip joints by designing the largest MRI study of asymptomatic volunteers. The objectives were to evaluate the pelvis and both hip joints before and after a marathon.

Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_5 | Pages 85 - 85
1 Apr 2019
RETRIEVAL ANALYSIS OF 3D-PRINTED TITANIUM ORTHOPAEDIC IMPLANTS
Dall'Ava L Hothi H Henckel J Cerquiglini A Laura AD Shearing P Hart A
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Introduction

The use of Additive Manufacturing (AM) to 3D print titanium implants is becoming widespread in orthopaedics, particularly in producing cementless porous acetabular components that are either custom-made or off-the-shelf; the primary design rationale for this is enhanced bony fixation by matching the porosity of bone. Analysis of these retrieved components can help us understand their performance; in this study we introduce a non-destructive method of the retrieval analysis of 3D printed implants.

Material and methods

We examined 11 retrieved 3D printed acetabular cups divided into two groups: “custom-made” (n = 4) and “off-the-shelf” (n = 7). A macroscopic visual analysis was initially performed to measure the area of tissue ongrowth. High resolution imaging of each component was captured using a micro-CT scanner and 3D reconstructed models were used to assess clinically relevant morphometric features of the porous structure: porosity, porous structure thickness, pore size and strut thickness. Optical microscopy was also used as a comparison with microCT results. Surface morphology and elemental composition of the implants were investigated with a Scanning Electron Microscope (SEM) coupled with an Energy Dispersive X-ray Spectroscope (EDS). Statistical analysis was performed to evaluate possible differences between the two groups.

The Bone & Joint Journal
Vol. 99-B, Issue 3 | Pages 310 - 316
1 Mar 2017
Assessment of the equivalence of a generic to a branded femoral stem
Hothi H Henckel J Shearing P Holme T Cerquiglini A Laura AD Atrey A Skinner J Hart A
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Aims

The aim of this study was to compare the design of the generic OptiStem XTR femoral stem with the established Exeter femoral stem.

Materials and Methods

We obtained five boxed, as manufactured, implants of both designs at random (ten in total). Two examiners were blinded to the implant design and independently measured the mass, volume, trunnion surface topography, trunnion roughness, trunnion cone angle, Caput-Collum-Diaphyseal (CCD) angle, femoral offset, stem length, neck length, and the width and roughness of the polished stem shaft using peer-reviewed methods. We then compared the stems using these parameters.

Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_11 | Pages 3 - 3
1 Jun 2016
DUAL MOBILITY VS STANDARD BEARINGS: WHAT IS THE EFFECT ON THE TAPER JUNCTION?
Laura AD Whittaker R Hothi H Kwon Y Skinner J Hart A
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Introduction

Dual-mobility bearings increase the stable range of motion of total hip arthroplasty (THA) but are limited by the mechanical effects of a large diameter metal on polyethylene bearing which may cause high rates of wear from the surfaces of the polyethylene bearing and the head-stem taper. Improved polyethylene (PE) has reduced concern over bearing wear but the effects on the taper junction are unknown.

We aimed to better understand the effect of dual mobility bearings on fretting-corrosion damage to the taper junction by comparison to standard bearings.

Materials and Methods

We collected and analysed retrieved hips of one design with either dual mobility (n= 39) or standard bearings (n=30). The bearing size in the dual mobility group was 42mm whereas in the standard bearing group it had a median of 36mm. Stem trunnions had V40 tapers. Time of implantation and body mass index were comparable between the two groups.

Fretting and corrosion at the stem trunnions was quantified by: 1) visual scoring and 2) surface profilometry.