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

Košak, Robert; Kralj‐Iglič, Veronika; Iglič, Aleš; Daniel, Matěj

doi:10.1007/s11999-011-2078-5

Cited by 18 publications

(22 citation statements)

References 42 publications

(105 reference statements)

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“…The inclination of the acetabular cup on the AP radiograph was determined by the abduction angle q A . The contact hip stress p was taken to attain a cosine function of the space angle g (Košak et al 2011):…”

Section: Biomechanical Evaluationmentioning

confidence: 99%

“…It was taken into account that the linear wear d 0 is proportional to the peak stress (Košak et al 2011):…”

Section: Biomechanical Evaluationmentioning

confidence: 99%

“…where d 0 is the displacement of the centre of the prosthesis head (taken as the linear wear) and k ¼ 3 £ 10 27 m 3 is a constant determined from the results presented in Košak et al (2011). Also, the direction of wear b was connected to the direction to the stress pole (Košak et al 2011…”

Section: Biomechanical Evaluationmentioning

confidence: 99%

“…A recent study involving 80 hips and using mathematical models (Košak et al 2011) has shown that the distance of largest penetration of the metal prosthesis head into the polyethylene cup (referred to as the linear wear) measured from anterior -posterior radiographs is proportional to the peak hip stress normal to the articular surface (contact hip stress) in the one-legged stance, while the direction of maximal wear follows the position of the stress pole. This indicates that contact hip stress could be a relevant parameter in wear and in failure of hip endoprosthesis.…”

Section: Introductionmentioning

confidence: 99%

“…Using mathematical models for the resultant hip force , contact hip stress (Ipavec et al 1999;Kralj-Iglič et al 2012) and penetration of the prosthesis head into the cup (Ilchmann et al 2008), and the measured relations between wear and contact stress parameters (Košak et al 2011), we predicted volumetric wear as a function of the cup abduction angle. Also, we estimated the relevance of the considered biomechanical parameters by assessment of wear in 95 hips with implanted endoprosthesis.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effect of cup inclination on predicted contact stress-induced volumetric wear in total hip replacement

Rijavec

Košak

Daniel

et al. 2014

Computer Methods in Biomechanics and Biomedical Engineering

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In order to increase the lifetime of the total hip endoprosthesis, it is necessary to understand mechanisms leading to its failure. In this work, we address volumetric wear of the artificial cup, in particular the effect of its inclination with respect to the vertical. Volumetric wear was calculated by using mathematical models for resultant hip force, contact stress and penetration of the prosthesis head into the cup. Relevance of the dependence of volumetric wear on inclination of the cup (its abduction angle ϑA) was assessed by the results of 95 hips with implanted endoprosthesis. Geometrical parameters obtained from standard antero-posterior radiographs were taken as input data. Volumetric wear decreases with increasing cup abduction angle ϑA. The correlation within the population of 95 hips was statistically significant (P = 0.006). Large cup abduction angle minimises predicted volumetric wear but may increase the risk for dislocation of the artificial head from the cup in the one-legged stance. Cup abduction angle and direction of the resultant hip force may compensate each other to achieve optimal position of the cup with respect to wear and dislocation in the one-legged stance for a particular patient.

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Section: Biomechanical Evaluationmentioning

confidence: 99%

“…It was taken into account that the linear wear d 0 is proportional to the peak stress (Košak et al 2011):…”

Section: Biomechanical Evaluationmentioning

confidence: 99%