Physicochemical and biomechanical examination of surfaces of retrieved polyethylene heads from total hip prostheses with rotating polyethylene head system

Katayama, Kuniaki; Maezawa, Hakuhiko; Uesato, Naomi; Sasada, Tadashi

doi:10.1007/s007760100005

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…Skurla and James evaluated damage using a semiquantitative user observation score. Such scoring systems are widely utilized46 and are useful within a given study but have limited global utility. Skurla and James found the expected trends while struggling with familiar issues: the need for a baseline sufficient to allow for calculations of quantitative wear and an accurate description of the surface damage.…”

Section: Discussionmentioning

confidence: 99%

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺

Shi¹,

Su²,

Wei³

et al. 2010

J of Applied Polymer Sci

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ABSTRACT:The controlled formation of aragonite by simple method under ambient condition is a big challenge for biomaterial scientists. In this article, we took poly (N-vinyl pyrrolidone) (PVP) as an example to investigate the influence of water-soluble nonionic polymers on the polymorphs of CaCO 3 via CO 2 diffusion method under ambient pressure and temperature, and found that the existence of PVP molecules favors the formation of aragonite with rosette superstructure. A possible mechanism is proposed that nonionic polymers can be doped into amorphous calcium carbonate (ACC) particles and further participate in the transformation process from ACC to aragonite and then promotes the formation of rosette superstructure through parallel aggregation by crosslinking the aragonite nuclei. The experiments of CaCO 3 crystallization in presence of poly(ethylene oxide) (PEO) and poly(vinyl alcohol) (PVA) confirmed the mechanism.

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Section: Discussionmentioning

confidence: 99%

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺

Shi¹,

Su²,

Wei³

et al. 2010

J of Applied Polymer Sci

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show abstract

“…20,45 Skurla and James evaluated damage using a semiquantitative user observation score. Such scoring systems are widely utilized 46 and are useful within a given study but have limited global utility. Skurla and James found the expected trends while struggling with familiar issues: the need for a baseline sufficient to allow for calculations of quantitative wear and an accurate description of the surface damage.…”

Section: Discussionmentioning

confidence: 99%

Three‐dimensional laser micrometry characterization of surface wear in total hip arthroplasty

et al. 2007

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Even after decades of clinical use, our ability to quantify wear across total hip replacement implant surfaces is largely limited to single value measurements. The influence of patient factors on wear remains enigmatic. This pilot study for the development of three-dimensional laser micrometry (3DLM) introduces an easy, accurate means of 'mapping' and quantifying material removal. A three-dimensional laser micrometer was constructed using a laser micrometer having an accuracy of 0.5 microm. A 3D surface map is triangulated from a point cloud consisting of approximately 140,000 individual points. Comparison to a reference sphere determines radial wear over the entire surface. 3DLM was able to map and quantify fine scale surface features. Even for zirconia on relatively soft ultra-high molecular weight polyethylene, this technique maps the contributions of localized wear at the macroscopic level. The 0.5 microm (or greater) accuracy of these lasers allows us to image surfaces with a high degree of confidence. This analysis lends itself well to automation, and we anticipate that this advance will prove valuable in establishing that each head and cup combination emerging from a given clinical environment has unique wear patterns as observed in this trial data set.

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“…The in vitro samples were scanned at room temperature around 22 ℃, whereas the in vivo implants were scanned at body temperature around 37 ℃. This temperature difference of 15 ℃ would change the liner thickness by 0.2% to 0.3%, through exact dimensional increases cannot be predicted for complex shapes (21). Thermal expansion is an issue rarely raised in orthopedic literature, although PE has one of the highest coefficients of thermal expansion among plastics, about 10 to 20 times greater than that of metals (31).…”

Section: Discussionmentioning

confidence: 99%

“…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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Physicochemical and biomechanical examination of surfaces of retrieved polyethylene heads from total hip prostheses with rotating polyethylene head system

Cited by 8 publications

References 8 publications

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺

Three‐dimensional laser micrometry characterization of surface wear in total hip arthroplasty

Quantification of clearance and creep in acetabular wear measurements

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Physicochemical and biomechanical examination of surfaces of retrieved polyethylene heads from total hip prostheses with rotating polyethylene head system

Cited by 8 publications

References 8 publications

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca2+

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca2+

Three‐dimensional laser micrometry characterization of surface wear in total hip arthroplasty

Quantification of clearance and creep in acetabular wear measurements

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Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺

Fabrication of aragonite rosette superstructure through the weak interaction between nonionic polymers and Ca²⁺