Evaluating the accuracy of wear formulae for acetabular cup liners

Wu, James S.; Hsu, Shu-Ling; Chen, Jian-Horng

doi:10.1007/s11517-009-0535-z

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…Volumetric penetration (primarily wear from 1 to 10 years) was then calculated using the formula described * Possible scores range from 0 to 48; HXLPE = highly crosslinked polyethylene; UHMWPE = ultrahigh-molecular-weight polyethylene. by Wu et al [43]. The penetration data were normally distributed in both groups.…”

Section: Radiostereometric Analysismentioning

confidence: 92%

The John Charnley Award: Highly Crosslinked Polyethylene in Total Hip Arthroplasty Decreases Long-term Wear: A Double-blind Randomized Trial

Glyn-Jones

Thomas

Roberts

et al. 2015

Clinical Orthopaedics &Amp; Related Research

130

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Background The use of highly crosslinked polyethylene (HXLPE) is now commonplace for total hip arthroplasty. Hip simulator studies and short-term in vivo measurements suggest that the wear rate of some types of HXLPE is significantly less than conventional ultrahigh-molecularweight polyethylene (UHMWPE). However, there are few long-term data to support its use. Questions/purposes The aim of this study was to measure the long-term steady-state wear of HXLPE compared with UHMWPE liners in a prospective, double-blind, randomized controlled trial using radiostereometric analysis. Methods Fifty-four patients were randomized to receive hip arthroplasties with either UHMWPE liners or HXLPE liners. Complete followup was available on 39 of these patients (72%). All patients received the same cemented stem and an uncemented acetabular component. Threedimensional penetration of the head into the socket was determined at 10 years using a radiostereometric analysis system, which has an in vivo accuracy of \ 0.1 mm. Oxford Hip Scores were compared between the groups. Results At 10 years there was significantly less wear of HXLPE (0.003 mm/year; 95% confidence interval [CI], ± 0.010; SD 0.023; range, À0.057 to 0.074) compared with UHMWPE (0.030 mm/year; 95% CI, ± 0.012; p \ 0.001; SD 0.0.27; range, À0.001 to 0.164). The volumetric penetration from 1 to 10 years for the UHMWPE group was 98 mm 3 (95% CI, ± 46 mm 3 ; SD 102 mm 3

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Section: Radiostereometric Analysismentioning

confidence: 92%

The John Charnley Award: Highly Crosslinked Polyethylene in Total Hip Arthroplasty Decreases Long-term Wear: A Double-blind Randomized Trial

Glyn-Jones

Thomas

Roberts

et al. 2015

Clinical Orthopaedics &Amp; Related Research

130

View full text Add to dashboard Cite

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“…However, failures still occur [2] and may have dramatic consequences such as pain, additional surgery and immobilization periods [3][4][5]. Aseptic loosening has been identified as one of the most current causes of implant failure [6,7] and may be related to the implant primary stability, which is determinant for the quality of osseointegration phenomena [8].…”

Section: Introductionmentioning

confidence: 99%

Finite element model of the impaction of a press-fitted acetabular cup

Michel

Nguyen

Bosc

et al. 2016

Med Biol Eng Comput

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Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area. Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area. 2 AbstractPress-fit surgical procedures aim at providing primary stability to acetabular cup (AC) implants. Impact analysis constitutes a powerful approach to retrieve the AC implant insertion properties. The aim of this numerical study was to investigate the dynamic interaction occurring between the hammer, the ancillary and bone tissue during the impact and to assess the potential of impact analysis to retrieve AC implant insertion conditions. A dynamic two-dimensional axisymmetric model was developed to simulate the impaction of the AC implant into bone tissue assuming friction at the bone-implant interface and large deformations. Different values of interference fit (from 0.5 to 2 mm) and impact velocities (from 1 to 2 m.s -1 ) were considered. For each configuration, the variation of the force applied between the hammer and the ancillary was analyzed and an indicator I was determined based on the impact momentum of the signal.The simulated results are compared to the experiments. The value of the polar gap decreases versus the impact velocity and increases versus the interference fit. The bone implant contact area was significantly correlated with the resonance frequency (R 2 =0.94) and the indicator (R 2 =0.95).The results show the potential of impact analyses to retrieve the bone-implant contact properties.Keywords: Acetabular cup; hip replacement; impact; finite element; bone; Biomechanics; bone Author Biographies:Adrien Michel has completed his PhD in biomechanics in the MSME laboratory. Romain Bosc and Philippe Hernigou are experienced surgeons. Vu-Hieu Nguyen and Salah Naili are experts in mechanical modeling and simulation. Romain Vayron and Guillaume Haiat are specialized in biomechanical engineering of implants.Finite element model of the impaction of a press-fitted acetabular cup: estimation of the contact area.3

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“…Nevertheless, some studies [9,29] pointed out that the Kabo formula produced errors as high as 45%. Recently, Ilchmann et al [19] compared several published formulae and proposed a new formula, which, however, has been found not to be sufficiently accurate [41]. The aim of this study was, therefore, to obtain a more accurate formula.…”

Section: Introductionmentioning

confidence: 92%

“…SolidWorks Ò software was used to create models of the worn out regions of liners at various wear directions and depths [41].…”

Section: Validation I: Solidwork ò 3d Wear Modelsmentioning

confidence: 99%

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Wear patterns of, and wear volume formulae for, cylindrically elongated acetabular cup liners

Hsu

Chen

2010

Med Biol Eng Comput

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This study analyzed the wear patterns of, and wear volume formulae for, cylindrically elongated acetabular cup liners. The geometric patterns of the wear surface were first classified, then wear volume formulae were derived by integral calculus. SolidWorks((R)) software or published formulae were used to verify the accuracy of the proposed formulae. The analytical results showed that the wear shape of the liner can be categorized into seven wear patterns, including the special case of wear at 90 degrees , and the seven corresponding wear formulae were derived. In addition, wear of the cylindrical elongation might add considerably to the volume loss of the liner, depending on the height and shape of the elongation and the depth and direction of the linear penetration, being maximally 21% in the investigated model. The proposed wear formulae and patterns will be useful for more accurate performance evaluation of existing hip components implanted in patients and for the designing of new hip components.

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Evaluating the accuracy of wear formulae for acetabular cup liners

Cited by 14 publications

References 26 publications

The John Charnley Award: Highly Crosslinked Polyethylene in Total Hip Arthroplasty Decreases Long-term Wear: A Double-blind Randomized Trial

The John Charnley Award: Highly Crosslinked Polyethylene in Total Hip Arthroplasty Decreases Long-term Wear: A Double-blind Randomized Trial

Finite element model of the impaction of a press-fitted acetabular cup

Wear patterns of, and wear volume formulae for, cylindrically elongated acetabular cup liners

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