Importance of preclinical evaluation of wear in hip implant designs using simulator machines

Trommer, Rafael Mello; Maru, Márcia Marie

doi:10.1016/j.rboe.2016.07.004

Cited by 17 publications

(13 citation statements)

References 45 publications

(83 reference statements)

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“…In the first 275,000 cycles, we observed a high initial wear rate of 3.9 mg/Mc (Fig. ), which is consistent with running‐in or run‐in wear that has been observed and discussed in human hip simulator studies . The physical reason for high run‐in wear is that the contacting surfaces of the femoral head and polyethylene liner are conforming to each other as non‐ideal surface irregularities are worn away .…”

Section: Discussionsupporting

confidence: 86%

Wear testing of a canine hip resurfacing implant that uses highly cross‐linked polyethylene

Warburton

Everingham

Helms

et al. 2017

Journal Orthopaedic Research

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Hip resurfacing offers advantages for young, active patients afflicted with hip osteoarthritis and may also be a beneficial treatment for adult canines. Conventional hip resurfacing uses metal-on-metal bearings to preserve bone stock, but it may be feasible to use metal-on-polyethylene bearings to reduce metal wear debris while still preserving bone. This study characterized the short-term wear behavior of a novel hip resurfacing implant for canines that uses a 1.5 mm thick liner of highly cross-linked polyethylene in the acetabular component. This implant was tested in an orbital bearing machine that simulated canine gait for 1.1 million cycles. Wear of the liner was evaluated using gravimetric analysis and by measuring wear depth with an optical scanner. The liners had a steady-state mass wear rate of 0.99 ± 0.17 mg per million cycles and an average wear depth in the central liner region of 0.028 mm. No liners, shells, or femoral heads had any catastrophic failure due to yielding or fracture. These results suggest that the thin liners will not prematurely crack after implantation in canines. This is the first hip resurfacing device developed for canines, and this study is the first to characterize the in vitro wear of highly cross-linked polyethylene liners in a hip resurfacing implant. The canine implant developed in this study may be an attractive treatment option for canines afflicted with hip osteoarthritis, and since canines are the preferred animal model for human hip replacement, this implant can support the development of metal-on-polyethylene hip resurfacing technology for human patients. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:1196-1205, 2018.

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Section: Discussionsupporting

confidence: 86%

Wear testing of a canine hip resurfacing implant that uses highly cross‐linked polyethylene

Warburton

Everingham

Helms

et al. 2017

Journal Orthopaedic Research

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“…Preclinical evaluation of new biomaterials is necessary, and it could be considered as an extension of the risk analysis [ 14 , 15 ]. The wear performance of these improved biomaterials is often evaluated using hip joint simulators.…”

Section: Introductionmentioning

confidence: 99%

Wear Behaviours and Oxidation Effects on Different UHMWPE Acetabular Cups Using a Hip Joint Simulator

et al. 2018

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Given the long-term problem of polyethylene wear, medical interest in the new improved cross-linked polyethylene (XLPE), with or without the adding of vitamin E, has risen. The main aim of this study is to gain further insights into the mutual effects of radiation cross-linking and addition of vitamin E on the wear performance of ultra-high-molecular-weight polyethylene (UHMWPE). We tested four different batches of polyethylene (namely, a standard one, a vitamin E-stabilized, and two cross-linked) in a hip joint simulator for five million cycles where bovine calf serum was used as lubricant. The acetabular cups were then analyzed using a confocal profilometer to characterize the surface topography. Moreover; the cups were analyzed by using Fourier Transformed Infrared Spectroscopy and Differential Scanning Calorimetry in order to assess the chemical characteristics of the pristine materials. Comparing the different cups’ configuration, mass loss was found to be higher for standard polyethylene than for the other combinations. Mass loss negatively correlated to the cross-link density of the polyethylenes. None of the tested formulations showed evidence of oxidative degradation. We found no correlation between roughness parameters and wear. Furthermore, we found significantly differences in the wear behavior of all the acetabular cups. XLPEs exhibited lower weight loss, which has potential for reduced wear and decreased osteolysis. However, surface topography revealed smoother surfaces of the standard and vitamin E stabilized polyethylene than on the cross-linked samples. This observation suggests incipient crack generations on the rough and scratched surfaces of the cross-linked polyethylene liners.

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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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Importance of preclinical evaluation of wear in hip implant designs using simulator machines

Cited by 17 publications

References 45 publications

Wear testing of a canine hip resurfacing implant that uses highly cross‐linked polyethylene

Wear testing of a canine hip resurfacing implant that uses highly cross‐linked polyethylene

Wear Behaviours and Oxidation Effects on Different UHMWPE Acetabular Cups Using a Hip Joint Simulator

Design of Hip Simulation Machine for Hip Labrum Testing

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