The Influence of Resting Periods on Friction in the Artificial Hip

Nassutt, R.; Wimmer, Markus A.; Schneider, Erich; Morlock, Michael M.

doi:10.1097/00003086-200302000-00020

Cited by 44 publications

(28 citation statements)

References 22 publications

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“…Fabry et al [28] have shown significant differences between daily life activities on the basis of slide tracks which represent the path of the femur relative to the pelvis during motion. Previous studies of Nassut et al [47] and Wimmer et al [48] reported a correlation between increases in the initial friction moment with increasing resting duration. Other conditions such as obesity, suboptimal implant placement, or a variation of the load direction have also received less attention to date [27,49].…”

Section: Discussionmentioning

confidence: 82%

The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners

Zietz

Fabry

Baum

et al. 2015

The Journal of Arthroplasty

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Section: Discussionmentioning

confidence: 82%

The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners

Zietz

Fabry

Baum

et al. 2015

The Journal of Arthroplasty

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“…This is the result of increased surface roughness, particulate metal debris between the articulating surfaces, lower synovial fluid viscosity, increased bearing clearance and abnormal motion behaviour of hip implant components. Generally, coefficient of friction in CoC hip devices is in the range of 0.04-0.13 [80,[101][102][103]. Nassutt and colleagues [101] reported a coefficient of friction varying from 0.104 for no resting duration up to 0.131 for resting duration of 60 seconds.…”

Section: Frictionmentioning

confidence: 99%

“…Generally, coefficient of friction in CoC hip devices is in the range of 0.04-0.13 [80,[101][102][103]. Nassutt and colleagues [101] reported a coefficient of friction varying from 0.104 for no resting duration up to 0.131 for resting duration of 60 seconds. This increase in coefficient of friction after rest is due to loss of fluid film lubrication and subsequent surface to surface contact when the relative velocity between the bearing surfaces is reduced.…”

Section: Frictionmentioning

confidence: 99%

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A review of squeaking in ceramic total hip prostheses

Askari

Flores

Dabirrahmani

et al. 2016

Tribology International

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The occurrence of audible squeaking in some patients with ceramic-on-ceramic (CoC) hip prostheses is a cause for concern. Great effort has been dedicated to understand the mechanics of the hip squeaking to gain a deeper insight into factors contributing to sound emission from CoC hip articulation. Disruption of fluid-film lubrication and friction were reported as the main potential cause, while patient and surgical factors, and design and material of hip implants, were also identified as leading factors. This article summarises the recent available literature on this subject to provide a platform for future research and development. Moreover, high wear rates and ceramic liner fracture as viable consequences of hip squeaking are discussed.

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“…A hip simulator protocol incorporating intermittent motion led to wear increase above that for continuous motion simulation, for metalon-metal implants, although the absolute wear rates still remained below those typical of retrieval studies. 16 A start-stop protocol 17 led to an increase in static friction after periods of rest, for a variety of bearing surfaces, suggestive of higher wear shortly after start-up. Stair descent, when combined with level walking, resulted in a significant increase in wear in a knee simulator.…”

Section: Introductionmentioning

confidence: 98%

Nonidentical and outlier duty cycles as factors accelerating UHMWPE wear in THA: A finite element exploration

Stewart

Pedersen

Callaghan

et al. 2006

Journal Orthopaedic Research

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Wear rate and wear direction vary considerably within total hip arthroplasty (THA) patient cohorts. Third body effects and wide-ranging differences in patient activity levels are two factors suspected of contributing to wear variability. A sliding-distance-coupled contact finite element formulation was used to test the hypothesis that nonidentical duty cycles (differing activities, or change of third body challenge) produce accelerations in polyethylene wear. Effects of nonidentical duty cycles, time-variant femoral head roughening, and outlier gait inputs were investigated. Without femoral head roughening, combination walk/stair-climb wear simulations did not result in appreciably higher volumetric wear than a walk-only simulation, but when a roughened zone was included, walk/stair-climb volumetric wear increased by approximately 57% above that of a similarly roughened walk-only simulation. To investigate time-variant femoral head roughening, wear simulations were begun with femoral head roughening at one location on the femoral head, switching to another location halfway through the simulation. Results varied depending on roughening sites, but cases of substantial increase in wear involved a transient jump in wear rate shortly after the change of head roughening location. Outlier duty cycles were simulated by increasing or decreasing the joint contact force and range of motion inputs, to levels at the 97.5th and 2.5th percentiles of a population of normal subjects. The resulting wear showed an increase or decrease closely proportional to the percentage by which each input (force or range of motion) was changed. ß

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The Influence of Resting Periods on Friction in the Artificial Hip

Cited by 44 publications

References 22 publications

The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners

The Divergence of Wear Propagation and Stress at Steep Acetabular Cup Positions Using Ceramic Heads and Sequentially Cross-Linked Polyethylene Liners

A review of squeaking in ceramic total hip prostheses

Nonidentical and outlier duty cycles as factors accelerating UHMWPE wear in THA: A finite element exploration

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