Prediction of lubricating film thickness in UHMWPE hip joint replacements

Jalali-Vahid, D.; Jagatia, M; Zhang, Jin; Dowson, D.

doi:10.1016/s0021-9290(00)00181-0

Cited by 102 publications

(79 citation statements)

References 18 publications

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“…However, metal-onpolyethylene total hip replacements normally operate with their bearing surfaces in very close conformity (fluid film thickness on the order of tenths of micrometers (Jalali-Vahid et al, 2001) if indeed not direct contact). Given that typically embedded third body particles often have sizes up into the hundreds of micrometers (Lundberg et al, 2007a), the question arises as to how such debris manages to reach wear-critical regions near the pole of the bearing space.…”

Section: Introductionmentioning

confidence: 99%

Effects of episodic subluxation events on third body ingress and embedment in the THA bearing surface

Heiner

Baer

Pedersen

et al. 2008

Journal of Biomechanics

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In total joint arthroplasty, third body particle access to the articulating surfaces results in accelerated wear. Hip joint subluxation is an under-recognized means by which third body particles could potentially enter the otherwise closely conforming articular bearing space. The present study was designed to test the hypothesis that, other factors being equal, even occasional events of femoral head subluxation greatly increase the number of third body particles that enter the bearing space and become embedded in the acetabular liner, as compared to level walking cycles alone. Ten metal-onpolyethylene hip joint head-liner pairs were tested in a multi-axis joint motion simulator, with CoCrMo third body particles added to the synovial fluid analog. All component pairs were tested for two hours of level walking; half also were subjected to twenty intermittent subluxation events. The number and location of embedded particles on the acetabular liners were then determined. Subluxation dramatically increased the number of third body particles embedded in the acetabular liners, and it considerably increased the amount of scratch damage on the femoral heads. Since both third body particles and subluxation frequently occur in contemporary total hip arthroplasty, their potent synergy needs to be factored prominently into strategies to minimize wear.

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Section: Introductionmentioning

confidence: 99%

Effects of episodic subluxation events on third body ingress and embedment in the THA bearing surface

Heiner

Baer

Pedersen

et al. 2008

Journal of Biomechanics

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“…In order to find out the key factor leading to the high lubricating performance of the therapeutic lubricants, the film thickness has been calculated to estimate what the lubrication mechanism of the lubricants is most likely to be [24]. The equations used in this study are from reference [25] and the parameters are listed in Table 3. The main governing equations are the Reynolds equation, which governs the fluid film lubrication between the two bearing surfaces.…”

Section: Discussionmentioning

confidence: 99%

Tribological Study on New Therapeutic Bionic Lubricants

Hua

Zhang

2007

Tribol Lett

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New therapeutic bionic lubricants for artificial joint lubrication and the treatment of particle-induced osteolysis were developed. In this study, their tribological characteristics and mechanisms have been investigated. The tribological experimental results show that the therapeutic lubricants have the best anti-wear performance among the lubricants tested, such as hyaluronic acid (HA) and bovine serum. Some self-assembled membranes were found on the surfaces of the cups, which might contribute to the high lubrication performance of the therapeutic lubricants. The calculated film thickness of therapeutic lubricants is about 0.310 lm, which is still in the boundary lubrication region. The preliminary biological experiments show that therapeutic lubricants have good biocompatibility. It is necessary to do more experimental work in the future to investigate the formation of the membrane and the medical performance of the therapeutic bionic lubricants for better understanding of the effects of the undesired reactions induced by the wear debris.

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“…This eccentricity is termed 'clearance', and is important to ensure smooth tribology, as it prevents jamming and facilitates lubrication with synovial fluid (19)(20)(21)(22)(23)(24)(25). Each bearing couple has a unique clearance, which depends on its articular diameter and materials.…”

Section: Introductionmentioning

confidence: 99%

Quantification of clearance and creep in acetabular wear measurements

Saffarini¹,

Grégory²,

Vandenbussche³

2016

Ann. Transl. Med.

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Background: This study aimed to measure femoral head penetration before occurrence of real wear, and to quantify the portions attributable respectively to clearance and plastic deformations in various acetabular designs. Methods:We analyzed CT scans from 15 patients at 'day five' after total hip arthroplasty (THA). All patients received Exafit ® femoral stems and 28 mm heads: 5 patients had cemented Durasul ® all-PE cups, 5 patients had uncemented Allofit ® metal-backed cups, and 5 patients had un-cemented Stafit ® dual-mobility cups. We also analyzed CT scans of samples of the three head-cup combinations to compare in vivo and in vitro measurements. Results:The mean femoral head penetration measured on 'day five' was lower for all-PE cups (0.196 mm) than for metal-backed cups (0.551 mm) and dual-mobility cups (0.634 mm). Conclusions:The present study indicates that isolated measurements of femoral head penetration include 0.15-0.46 mm of radial clearance and 0.05-0.27 mm of creep, and confirms that the majority of so-called beddingin observed in the first post-operative months is not entirely due to wear.

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Prediction of lubricating film thickness in UHMWPE hip joint replacements

Cited by 102 publications

References 18 publications

Effects of episodic subluxation events on third body ingress and embedment in the THA bearing surface

Effects of episodic subluxation events on third body ingress and embedment in the THA bearing surface

Tribological Study on New Therapeutic Bionic Lubricants

Quantification of clearance and creep in acetabular wear measurements

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