Tribological Assessment of UHMWPE in the Hip

Essner, Aaron; Wang, Aiguo

doi:10.1016/b978-0-12-374721-1.00025-0

Cited by 7 publications

(3 citation statements)

References 84 publications

(112 reference statements)

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“…The use of joint simulators provides a means of testing materials in prosthesis form under conditions similar to their intended use. A recent advancement in hip joint simulation is the realization that multidirectional motion reproduces clinically relevant wear mechanisms, wear debris, and wear magnitudes in polymer implants 10. Thus, anatomical positioning, movement, and physiological loads that occur during normal gait must be correctly simulated, even while ignoring wider ranges of load and motion that are applied during many activities.…”

mentioning

confidence: 99%

Long‐term evaluation of a compliant cushion form acetabular bearing for hip joint replacement: A 20 million cycles wear simulation

Elsner¹,

Shemesh²,

Mezape³

et al. 2011

Journal Orthopaedic Research

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Soft bearing materials that aim to reproduce the tribological function of the natural joint are gaining popularity as an alternative concept to conventional hard bearing materials in the hip and knee. However, it has not been proven so far that an elastic cushion bearing can be sufficiently durable as a long term ($20 years) articulating joint prosthesis. The use of new bearing materials should be supported by accurate descriptions of the implant following usage and of the number, volume, and type of wear particles generated. We report on a long-term 20 million cycle (Mc) wear study of a commercial hip replacement system composed of a compliant polycarbonate-urethane (PCU) acetabular liner coupled to a cobalt-chromium alloy femoral head. The PCU liner showed excellent wear characteristics in terms of its low and steady volumetric wear rate (5.8-7.7 mm 3 /Mc) and low particle generation rate (2-3 Â 10 6 particles/Mc). The latter is 5-6 orders of magnitude lower than that of highly cross-linked polyethylene and 6-8 orders of magnitude lower than that of metal-on-metal bearings. Microscopic analysis of the implants after the simulation demonstrated a low damage level to the implants' articulating surfaces. Thus, the compliant PCU bearing may provide a substantial advantage over traditional bearing materials. Keywords: total hip replacement; polycarbonate-urethane; bio-ferrography; filtration; fatigue A main concern in the developing implants for total hip replacement (THR) is the interaction between the implant's bearing surfaces as they contact during motion. Abrasive and adhesive wear mechanisms can lead to formation of wear debris. The accumulation of debris can activate macrophages to stimulate the production of antibodies, which attack the debris, the implant, and the surrounding bone. This process can cause osteolysis, aseptic loosening, and failure of the implant. 1,2 A new alternative, which has gained interest in recent years, is that of soft bearing materials aimed at reducing wear by maintaining a fluid film between the articulating surfaces, reproducing the tribological function of the natural joint. The theoretical and actual wear properties of soft orthopedic bearings have been explored since the 1980s. 3-5 These studies demonstrated clear advantages towards this type of bearing compared to hard bearings in terms of reduced friction and wear. Only recently, however, have cushion bearing implants been produced and their performance characterized in laboratory and animal studies. [6][7][8][9] The use of joint simulators provides a means of testing materials in prosthesis form under conditions similar to their intended use. A recent advancement in hip joint simulation is the realization that multidirectional motion reproduces clinically relevant wear mechanisms, wear debris, and wear magnitudes in polymer implants. 10 Thus, anatomical positioning, movement, and physiological loads that occur during normal gait must be correctly simulated, even while ignoring wider ranges of load and motion that...

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mentioning

confidence: 99%

Long‐term evaluation of a compliant cushion form acetabular bearing for hip joint replacement: A 20 million cycles wear simulation

Elsner¹,

Shemesh²,

Mezape³

et al. 2011

Journal Orthopaedic Research

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“…Four load profiles were modeled; “walking” and “stair climb” loading profiles were representative of activities of daily living measured by an instrumented THR implant . The “orbital hip sim” load profile represented the loading cycle applied by an orbital hip simulator which undergoes biaxial rocking motion with angular displacements in flexion/extension (F/E) and abduction/adduction (Abd/Add) . The “prosim” load profile simulated the loading profile exerted by a hip simulator which applies dual axes rotations, namely, F/E and internal/external rotation .…”

Section: Methodsmentioning

confidence: 99%

Prediction of taper performance using quasi static FE models: The influence of loading, taper clearance and trunnion length

Raji

Shelton

2018

J Biomed Mater Res

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The head-neck taper junction has been widely reported to corrode leading to adverse tissue reactions. Taper corrosion is a poorly understood phenomenon but has been associated with oxide layer damage and ingress of corrosive physiological fluids. Micromotion may damage the oxide layer; although little is understood about the prevailing stresses which cause this. The ingress of fluid around the joint space into the taper will depend on the taper contact position and the separation of the interfaces during loading. The current work reports on the effect of taper clearances and trunnion length on the taper surface stresses and the taper gap opening. These were determined for CoCr/Ti taper interfaces using FE under loading conditions including walking and stair climb as well as hip simulator load profiles. Shorter trunnions and stair climb loading were shown to generate the greatest taper gaps (82 µm) and also the largest surface stresses (1200 MPa) on the head taper. The largest taper gaps were associated with smaller taper contact areas. Clearances within ±0.1° had no effect on the taper gaps generated, as the tapers engaged over comparable lengths; the taper gap opening was dependent upon the taper engagement length rather than location (proximal or distal) of contact. The walking profile or variants applied by hip simulators, was insufficient to differentiate between taper designs and evaluate differences in the magnitudes of taper gaps. The use of more demanding activity such as stair climb during in vitro evaluations could provide better predictions of taper performance in vivo. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2018.

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“…analysis of wear debris retrieved from the patient ( ex vivo ) [200]. Among the screening techniques, hip simulation is found to be the most reliable technique to assess the tribological performance of biomaterials [201], as it can effectively mimic natural joint-like conditions in vitro . The complexity of the joint configuration, and other material design aspects, especially the roughness of the counterface, femoral head diameter, clearance, and sphericity, etc., have also been shown to affect the resulting wear properties significantly [192].…”

Section: Clinically Relevant Propertiesmentioning

confidence: 99%

Six decades of UHMWPE in reconstructive surgery

Chowdhury

Keshavan

Basu

2022

International Materials Reviews

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Ultra-high molecular weight polyethylene (UHMWPE) materials have played a significant role in the field of reconstructive surgery, particularly as acetabular liners/sockets for total hip joint replacement (THR), and tibial inserts for total knee joint replacement (TKR). This review aims to provide a perspective on key elements regarding the processing-structure-property relationship of UHMWPE and derivatives. Much emphasis will be provided to discuss the clinically relevant properties of UHMWPE blend/composite formulation, Vitamin-E reinforced or highly crosslinked variants. In addition, we provide clinical insights into the role of wear debris in inflammation and osteolysis. The relatively unexplored domain of UHMWPE additive manufacturing. Finally, the relatively unexplored domain of UHMWPE additive manufacturing and the opportunities associated with the next generation of UHMWPE implants are highlighted.

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Tribological Assessment of UHMWPE in the Hip

Cited by 7 publications

References 84 publications

Long‐term evaluation of a compliant cushion form acetabular bearing for hip joint replacement: A 20 million cycles wear simulation

Long‐term evaluation of a compliant cushion form acetabular bearing for hip joint replacement: A 20 million cycles wear simulation

Prediction of taper performance using quasi static FE models: The influence of loading, taper clearance and trunnion length

Six decades of UHMWPE in reconstructive surgery

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