Influence of hip joint simulator design and mechanics on the wear and creep of metal-on-polyethylene bearings

Ali, Murat; Al-Hajjar, Mazen; Partridge, Susan; Williams, Sophie; Fisher, John; Jennings, Louise

doi:10.1177/0954411915620454

Cited by 21 publications

(11 citation statements)

References 68 publications

(90 reference statements)

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“…CoC bearing couples exhibit extremely low wear rates in hip simulator tests in the range of 0.05–0.1 mm 3 /million cycles (Mc) . This compares with MoP hips which have wear rates of 10–51 mm 3 /Mc for conventional PE and less than 20 mm 3 /Mc for crosslinked PE . Despite over 100‐fold differences in wear rates between CoC and conventional PE hips, revision rates at 13 years for uncemented CoC (5.69%) and uncemented MoP (5.90%) procedures are currently very similar .…”

Section: Introductionmentioning

confidence: 99%

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Bhalekar¹,

Smith²,

Joyce³

2018

J Biomed Mater Res

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Ceramic-on-ceramic (CoC) total hip replacements (THR) have a substantially lower wear rate than metal-on-polyethylene (MoP) hips, as shown by hip simulator testing. However, the revision rates of CoC and MoP hips are comparable. To try and explain this discrepancy the wear, at both the bearing surfaces and taper-trunnion interface of 36 mm BIOLOXdelta CoC THRs, mounted on 12/14 titanium (Ti6Al4V) trunnions was investigated using a hip simulator (n = 3) and a dynamically loaded CoC sample in a separate test station. Wear was assessed gravimetrically and surface roughness measurements of the articulating and taper surfaces taken at regular intervals. Scanning electron microscopy, surface roughness, and gravimetric measurements of trunnions was performed. After 5 million cycles, the mean total wear from the ceramic articulating surfaces was 0.25 mm from the hip simulator test, and that from the titanium trunnions was 0.29 mm . This metal wear may provide an explanation for adverse reaction to metal debris found in contemporary CoC hip joints. It is therefore vital to consider taper-trunnion wear in preclinical testing of artificial hip joints. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res B Part B, 2018.

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Section: Introductionmentioning

confidence: 99%

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Bhalekar¹,

Smith²,

Joyce³

2018

J Biomed Mater Res

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“…Ceramic-on-ceramic (BIOLOX ® delta) 36 mm diameter hip replacement bearings (PINNACLE ® , DePuy Synthes Joint Reconstruction, Leeds, UK), with a nominal diametric clearance of 100 micrometres, were investigated using an electromechanical hip joint simulator (ProSim EM13, Simulation Solutions, Stockport, UK) [26] (Figure 1). The femoral head was placed onto a vertical spigot with a 12/14 taper and the acetabular cup was press fit into a metallic shell (PINNACLE ® , DePuy Synthes Joint Reconstruction, Leeds, UK).…”

Section: Methodsmentioning

confidence: 99%

The Influence of Kinematic Conditions and Variations in Component Positioning on the Severity of Edge Loading and Wear of Ceramic-on-Ceramic Hip Bearings

et al. 2019

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Dynamic separation and direct edge loading of hip replacement bearings can be caused by many factors, including implant positioning, implant design, changes in device over time, surgical variations and patient variations. Such dynamic separation and direct edge loading can lead to increased wear. Different input kinematic conditions have been used for experimental hip simulator studies to produce clinically relevant elliptical contact wear paths between the bearings during gait. The aim of this study was to investigate the influence of input kinematics (two axes of rotation simulation conditions (without abduction/adduction) and three axes of rotation simulation conditions (with abduction/adduction and different loading profiles) and variations in component positioning (different levels of medial-lateral translational mismatch at standard and steep cup inclination angles) on the occurrence, severity of edge loading, dynamic separation and wear of size 36 mm ceramic-on-ceramic hip bearings on an electromechanical hip joint simulator. The results showed that, overall, either of the two axes or three axes input profiles were equally valid in providing a suitable preclinical testing method for assessing the occurrence and severity of edge loading and wear under edge loading conditions. In terms of component positioning, as cup inclination and medial-lateral translational mismatch increased, so did dynamic separation, axial load at the rim, severity of edge loading and wear.

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“…Many in vitro testing devices have been designed and used in various tests. The main purpose is to mimic the real daily activities such as the wear testing machine for dental crown application is mimic the human oral cavity condition [21], the hip joint simulator is mimic the load and angular displacements of two and three axes of hip rotation to test the wear and creep of metal-on-polyethylene bearing [22] and the mechanical simulator is mimic the cycling angular movement and loading to evaluate the hip wear performance [23,24] and use of multi-axial wear machine [25,26]. Hip simulation machine developed for this research applied AC servo motor to control the loading to be as close as constant body weight when the testing hip moving.…”

Section: Hip Simulation Machinementioning

confidence: 99%

Design of Hip Simulation Machine for Hip Labrum Testing

Angsutanasombat¹,

Aroonjarattham²,

Saengpetch³

et al. 2018

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The acetabular labrum is the connective tissue between femoral head and hip joint that acts like a shock absorber. Labral injury could happen after hip dislocation or internal derangement such as femeroacetabular impingement (FAI) syndrome. The surgeon usually attempts to repair or reconstruct the torn labrum to obtain the native hip biomechanical loading. There has been no scientific evidence study for the different surgical techniques. Hip simulation machine was made to let a femur move in six conditions including flexion, extension, abduction, adduction, internal rotation and external rotation. The hip was compressed with a force of half of the body weight (350 N). The purpose of this study was to study pressurization in three labral conditions including intact labrum, labral repair and labral reconstruction. The machine was designed and simulated by SolidWorks software. A device's controller had two mode including a manual mode to set zero before an operation and automation mode to move in six conditions and compressed with a force of body weight. After the construction, the machine was tasted by using counterfeit pelvis and femur. The device was reformed before a real taste. Dissected cadaveric pelvises were used and measured pressure through the film piezoresistive load sensors. The testing result was helped the surgeon to make a decision in surgery process.

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Influence of hip joint simulator design and mechanics on the wear and creep of metal-on-polyethylene bearings

Cited by 21 publications

References 68 publications

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

Wear at the taper‐trunnion junction of contemporary ceramic‐on‐ceramic hips shown in a multistation hip simulator

The Influence of Kinematic Conditions and Variations in Component Positioning on the Severity of Edge Loading and Wear of Ceramic-on-Ceramic Hip Bearings

Design of Hip Simulation Machine for Hip Labrum Testing

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