Polyethylene Wear in Retrieved Canine Acetabular Components

2000 ◽  
Vol 13 (02) ◽  
pp. 78-86 ◽  
Author(s):  
D. Tompkins ◽  
B. Bhushan ◽  
M. L. Olmstead ◽  
J. Dyce
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Total Hip Replacement ◽  
Acetabular Component ◽  
Hip Replacement ◽  
Polyethylene Wear ◽  
Total Hip ◽  
Particulate Debris ◽  
Acetabular Components ◽  
Scanning Electron

SummaryThe aim of this pilot study was to define the mechanism and mode of polyethylene wear in acetabular components retrieved from seven dogs following therapeutic total hip replacement. The articular surface of each acetabular component was examined using contact profilometry and scanning electron microscopy (SEM). Peak-tovalley distance (P-V) and arithmetic average surface roughness (Ra) were calculated for each quadrant of the surface. Deformation of the regular profile of the machining lines was the least severe form of surface alteration. Randomly orientated scratches, fine tapered filaments, ripples, and coarse surface shredding were common SEM observations. Gouging of the convex surface of the cup was seen in two cases following failure of the polyethylenecement interface. Wear of the nonarticular acetabular rim suggested neck impingement in one case. P-V and Ra were significantly lower in the craniodorsal zone, compared to the average roughness of the other three quadrants (p < 0.05). Abrasion, adhesion and fatigue were the principal mechanisms of polyethylene wear, and were implicated in the production of polyethylene particulate debris. Meticulous removal of abrasive third bodies at the time of surgery, and correct orientation of the acetabular component, should reduce early and severe wear.Polyethylene wear is inevitable following metal-on-polyethylene total hip replacement. In this study, the nature of polyethylene wear in retrieved canine acetabular components was defined, using contact profilometry and scanning electron microscopy. Abrasion, adhesion and fatigue were the principal mechanisms of wear, and were implicated in the production of polyethylene particulate debris.

Evaluation of femoral head damage during canine total hip replacement

2003 ◽  
Vol 16 (03) ◽  
pp. 184-190 ◽  
Author(s):  
H. Powell ◽  
A. Kohm ◽  
J. J. Lannutti ◽  
J. Dyce ◽  
I. Wood
Keyword(s):  
Electron Microscopy ◽  
Femoral Head ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Polyethylene Wear ◽  
Optical Profilometry ◽  
Total Hip ◽  
Coated Metal ◽  
Hip Reduction ◽  
Scanning Electron

SummaryThree types of hip skids and a Hohmann retractor technique were used to facilitate reduction of the prosthesis in cadaveric canine total hip replacement. The degree of damage to the femoral head was evaluated using scanning electron microscopy and optical profilometry. Standard metal and ME-92 coated metal hip skids caused severe regional scratching of the femoral head. Morphologically similar scratch patterns were also identified on femoral heads retrieved from clinical patients. Use of a plastic coated skid or the Hohmann retractor technique had no perceptible effect on surface finish, and therefore either method is acceptable in clinical practice. The use of metal hip skids cannot be recommended for hip reduction as the resultant pattern of femoral head scratching is likely to be associated with early and severe polyethylene wear.

Wear Failure Analysis of UHMWPE Acetabular Cups in THR

2019 ◽  
Vol 957 ◽  
pp. 417-426
Author(s):  
Corneliu Nicolae Druga ◽  
Ileana Constanta Rosca ◽  
Radu Necula
Keyword(s):  
Femoral Component ◽  
Total Hip Replacement ◽  
Acetabular Component ◽  
Hip Replacement ◽  
Hip Prosthesis ◽  
Polyethylene Wear ◽  
Femoral Shaft ◽  
Hip Resurfacing ◽  
Total Hip ◽  
Joint Prostheses

The UHMWPE acetabular cups are the most popular joints for joint prostheses after Charnley introduced UHMWPE for the acetabular component in 1962. It has been demonstrated that polyethylene wear remains the main source of particles in the THR and therefore requires particular attention. The paper presents a series of theoretical and practical aspects regarding the wear of acetabular cups (made of UHMWPE) from the total hip prosthesis component. At the same time, the other tribological phenomena that occur in these MoP (metal on polyethylene) combinations are treated, such as lubrication and friction. Total Hip Replacement & Hip Resurfacing A hip replacement involves replacing the hip joint with a mechanical bearing system which is comprised of a femoral component and an acetabular component. During a hip replacement the acetabulum is reamed and the acetabular component is fitted into the cavity and the femoral component can either be placed over a reamed femoral head, in a procedure referred to as hip resurfacing, or positioned inside the femoral shaft during a total hip replacement [1]. Fig. 1. Total Hip Replacement (a) and Hip Resurfacing Replacement (b) [2].

Cup Deformation during total Hip Replacement: A Brief Report

1996 ◽  
Vol 6 (3) ◽  
pp. 127-128
Author(s):  
D.I. Wise ◽  
S.J. Calder ◽  
B. Derbyshire
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Polyethylene Wear ◽  
Total Hip

Cup deformation is demonstrated to be significantly greater using an 8 mm than a 22 mm pusher. Deformation may lead to increased polyethylene wear and late prosthetic failure. Use of a 22 mm pusher is recommended in Charnley total hip replacement.

A Manoeuvre to Facilitate Acetabular Component Retrieval following Intra-Pelvic Migration

2009 ◽  
Vol 19 (2) ◽  
pp. 157-159 ◽  
Author(s):  
Mudussar A. Ahmad ◽  
Leela C. Biant ◽  
Rene Tayar ◽  
Paul R. Thomas ◽  
Richard E. Field
Keyword(s):  
Total Hip Replacement ◽  
Acetabular Component ◽  
Closed Reduction ◽  
Hip Replacement ◽  
Retroperitoneal Approach ◽  
Component Retrieval ◽  
Total Hip ◽  
Surface Contour ◽  
Component Extraction ◽  
Component Migration

Acetabular component extraction following intra-pelvic migration of a total hip replacement can be hazardous to pelvic tissues, vessels and organs. Acetabular component removal is usually performed using an abdominal retroperitoneal approach. We describe a closed reduction of the acetabular component using a traction/manipulation technique. This manoeuvre can be used in cases of intra-pelvic acetabular component migration where the surface contour of the acetabular component is uncomplicated and an interposition membrane separates the implant from adjacent intra-pelvic structures.

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