Detailed three-dimensional size and shape characterisation of UHMWPE wear debris

Gladkis, Laura G.; Timmers, H.; Scarvell, Jennie M.; Smith, Paul N.

doi:10.1016/j.wear.2010.12.005

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…Particles between 1 μm and 10 μm in diameter show the greatest range in aspect ratio. This is a behaviour that has been observed previously in knee implants despite the differences in the kinematics of the arthroplasty [9,31].…”

Section: Aspect Ratio Of the Debrissupporting

confidence: 80%

“…From the size distributions shown in Table 1, the UHMWPE debris from the spinal simulator was somewhat in agreement with that of other TJRs [9,[15][16][17][18][19][20][21]. However it is difficult to make direct comparisons as test, sample preparation and assessment methodologies and equipment vary between research groups [8].…”

Section: Discussionmentioning

confidence: 81%

“…Mobile bearings [9] Knee joint simulator Elongated, fibril like, and spherical 0.2-0.8 μm AFM, SEM Revision surgery of THRs [15] Periprosthetic tissues Cylindrical, slice and spherical 0.1-10 μm and N10 μm SEM, IR, EDX/EDS Mobile bearing [16] Hip joint simulator Round, flake, stick, and twig Frequently occurs within range of 1-30 μm, but overall size range is 0. filters and prepared for SEM and imaged in the same way as the in vitro implant samples outlined above.…”

Section: Typementioning

confidence: 99%

“…Scanning electron micrographs provide excellent qualitative information of wear particles, and with the aid of computer vision techniques, can also provide quantitative analysis. The methods and analysis gained through computer vision can range in degrees of sophistication [9][10][11][12], from simple area and aspect ratio measurements to machine Biotribology 1-2 (2015) 42-50 learning and object recognition. A further benefit of this is that by classifying debris by morphology, the wear regime can often be inferred [13].…”

Section: Introductionmentioning

confidence: 99%

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The evolution of polymer wear debris from total disc arthroplasty

2015

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a b s t r a c tTotal disc arthroplasty is an alternative to spinal fusion, aimed at preserving flexibility; these devices typically involve a cobalt chrome molybdenum alloy socket articulating against an ultra-high molecular weight polyethylene (UHMWPE) ball. As with all artificial joints, wear debris is of particular concern due to its effect on both implant life and the in vivo biological reactions that can occur. In this paper, a profile of the UHMWPE wear debris generated from disc arthroplasty, tested on a spine simulator, is built with a combination of SEM image analysis tools. SEM images were analysed by computer vision, which allowed size and shape information to be extracted and images to be categorised by the shared topological features on individual wear particles. The computer visions techniques were based on a Scale Invariant Feature Transform (SIFT) to extract key point data from individual images and a Support Vector Decision Machine (SVM) to filter images based on a series of trained parameters. As certain wear particle morphology is predominantly produced by a particular wear regime, grouping wear particles by morphology and size made it possible to infer the relative rates of various wear regimes responsible for wear debris generation. By sampling synovial lubricant at intervals throughout the tribological test, the predominant wear regimes and particle sizes were tracked over the course of the implant life. Wear debris samples were taken at 12 intervals over a 5 million cycle test. The majority of debris was found to be 0.88 μm in equivalent circle diameter, with an aspect ratio (defined as the major over the minor diameter of the smallest possible encompassing ellipse of the debris) of 1.55. There was a decreasing trend in average particle size as the number of cycles increased. During the early stages of the test, adhesion and abrasion were dominant in forming particle morphologies, however after 2 million cycles; particles generated as a result of fatigue became the major particle morphology.

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Section: Aspect Ratio Of the Debrissupporting

confidence: 80%

Section: Discussionmentioning

confidence: 81%

Section: Typementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The evolution of polymer wear debris from total disc arthroplasty

2015

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“…Investigations of the size and shape of individual wear particles are allowed as the particle overlapping problem in the ferrography can be significantly minimized or eliminated. It has been applied to investigate metallic wear particles [92] and ultrahigh molecular weight polyethylene wear particles found in knee prosthesis [93], as well as to wear particles found in sheep knee synovial fluid [39,94]. Caution is needed when applying this technique because the filter membrane may be ruptured due to a large applied force.…”

Section: Preparation Techniques Of Biological Wear Particlesmentioning

confidence: 99%

Wear in human knees

Wang

Peng

2015

Biosurface and Biotribology

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Wear occurs in natural knee joints and plays a pivotal factor in causing articular cartilage degradation in osteoarthritis (OA) processes. Wear particles are produced in the wear process and get involved in inflammation of human knees. This review presents progresses in the mechanical and surface morphological studies of articular cartilages, wear particles analysis techniques for wear studies and investigations of human knee synovial fluid in wear of human knees. Future work is also included for further understanding of OA symptoms and their relations which may shed light on OA causes. & 2015 Southwest Jiaotong University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Analysis of polyethylene wear of reverse shoulder components: A validated technique and initial clinical results

2017

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One of the most prevalent phenomena associated with reverse total shoulder arthroplasty (rTSA) is scapular notching. Current methods examine only the damage to the scapula and no methods are available for quantifying the total wear volume of the polyethylene humeral bearing. Quantifying the polyethylene material loss may provide insight into the mechanism for scapular notching and into the particle dose delivered to the patient. A coordinate measurement machine (CMM) and custom computer algorithms were employed to quantify the volumetric wear of polyethylene humeral bearings. This technique was validated using two never-implanted polyethylene humeral liners with a controlled amount of wear in clinically relevant locations. The technique was determined to be accurate to within 10% of the known value and within 5 mm of the gravimetrically determined values. Following validation, ten retrieved polyethylene humeral liners were analyzed to determine a baseline for future clinical tests. Four of the ten polyethylene humeral liners showed visible and measureable wear volumes ranging from 40 to 90 mm total with a maximum wear rate as high as 470 mm /year in one short duration and significantly damaged humeral liner. This validated technique has the potential to relate patient outcomes such as scapular notching grades to polyethylene release into the body. While the total wear volumes are less than reported in literature for cases of osteolysis in knee and hip patients, dosages are well within the osteolytic thresholds that have been suggested, indicating that osteolysis may be a clinical concern in the shoulder. This work provides the basis for future studies that relate volumetric wear to patient outcomes. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:980-987, 2017.

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Detailed three-dimensional size and shape characterisation of UHMWPE wear debris

Cited by 17 publications

References 20 publications

The evolution of polymer wear debris from total disc arthroplasty

The evolution of polymer wear debris from total disc arthroplasty

Wear in human knees

Analysis of polyethylene wear of reverse shoulder components: A validated technique and initial clinical results

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