Enhanced computational prediction of polyethylene wear in hip joints by incorporating cross-shear and contact pressure in additional to load and sliding distance: Effect of head diameter

Purpose The research questions of the present study were: (1) Is total knee prosthesis wear behaviour influenced by implant size, body weight and their combined effect? (2) Are these findings significant and helpful from a clinical point of view? Methods Two very different sizes of the same total knee prosthesis (TKP), previously tested with ISO 14243 parameters, were tested on a knee simulator for a further two million cycles using a modified ISO 14243 load waveform. Roughness examination was performed on the metallic components. Gravimetric and micro-Raman spectroscopic analyses were carried out on the polyethylene inserts. Results The average volumetric mass loss was 69 ± 3 mm 3 and 88 ± 4 mm 3 for smaller and bigger size, respectively. Bigger TKPs are little influenced by an increased load, while the wear trend of the smaller TKP showed a redoubled slope, and more significant morphology changes were observed. However, the two sizes seem to behave similarly when subjected to a load increase of 15 %; the slope of the volumetric mass loss trend was comparable for the two sets of inserts, which did not appear significantly different also at the molecular level. Roughness average parameters of the lateral femoral condyle support this evidence. Conclusions It can be asserted that the body weight and implant size are relevant to the understanding of TKP wear behaviour. A post-implantation body weight increase in a patient with smaller knee dimensions could results in more critical effects on prosthesis long-term performance.

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“…Those findings were also confirmed by Kang et al [45] in hip bearings, which found a higher volumetric wear rate in larger prostheses.…”

Section: Discussionsupporting

confidence: 81%

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Battaglia

Taddei

Tozzi

et al. 2014

International Orthopaedics (SICOT)

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“…The models suggest the geometry of the prosthesis, ie, the radius of the femoral head [25], polyethylene cup thickness [22], or cup inclination [33,34] and the contact surface properties, ie, femoral head roughness [5], influence wear. The wear rate assessed using these mathematical models [25,33,34,38] agrees well with the wear measured in a clinical study [20], suggesting an important role of contact stress in mechanical damage of the polyethylene surface. One study using a hip simulator [27] found increased total load related to greater wear, again suggesting a role of contact stress in wear.…”

Section: Introductionsupporting

confidence: 75%

Polyethylene Wear is Related to Patient-specific Contact Stress in THA

Košak

Kralj‐Iglič

Iglič

et al. 2011

Clinical Orthopaedics &Amp; Related Research

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“…where C is a non-dimensional wear coefficient dependent on a cross-shear ratio (CS), determined from the experimental measurements of a multi-directional POD wear test in the presence of bovine serum lubricant to achieve the same boundary and mixed lubrication condition as in artificial joints [35,[48][49][50]:…”

Section: Wear Modelmentioning

confidence: 99%

A patient-specific wear prediction framework for an artificial knee joint with coupled musculoskeletal multibody-dynamics and finite element analysis

Zhang

Chen

Wang

et al. 2017

Tribology International

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A novel wear prediction framework was developed by coupling a patient-specific lower extremity musculoskeletal multibody dynamics model with the finite element contact mechanics and wear model of total knee replacement. The tibiofemoral contact forces and kinematics were influenced by articular surface wear, and in turn, the variations from the knee dynamics resulted in increases in the volumetric wear of 404.41 mm 3 after 30 million cycle simulation from 380.86 mm 3 from the traditional wear prediction using fixed load/motions. The developed patient-specific wear prediction framework provided a reliable virtual platform for investigating articular surface wear of total knee replacements.

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Enhanced computational prediction of polyethylene wear in hip joints by incorporating cross-shear and contact pressure in additional to load and sliding distance: Effect of head diameter

Cited by 91 publications

References 27 publications

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Toward the interpretation of the combined effect of size and body weight on the tribological performance of total knee prostheses

Polyethylene Wear is Related to Patient-specific Contact Stress in THA

A patient-specific wear prediction framework for an artificial knee joint with coupled musculoskeletal multibody-dynamics and finite element analysis

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