The yielding, plastic flow, and fracture behavior of ultra-high molecular weight polyethylene used in total joint replacements

Kurtz, Steven M.; Pruitt, Lisa A.; Jewett, Charles W.; Crawford, R. Paul; Crane, Deborah J.; Edidin, Avram A.

doi:10.1016/s0142-9612(98)00112-4

Cited by 137 publications

(80 citation statements)

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“…33 The contact pressure was maximal in the countered or retroversion case. From 10 mm of mismatch, it exceeded the polyethylene yield strength, 20,36 and consequently, damage accumulation and a reduced fatigue life of the component could be expected. Moreover, because contact pressure is related to wear, we can assume that a mismatch increase will also produce a wear increase.…”

Section: Discussionmentioning

confidence: 97%

Influence of glenohumeral conformity on glenoid stresses after total shoulder arthroplasty

Terrier

Büchler

Farron

2006

Journal of Shoulder and Elbow Surgery

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Section: Discussionmentioning

confidence: 97%

Influence of glenohumeral conformity on glenoid stresses after total shoulder arthroplasty

Terrier

Büchler

Farron

2006

Journal of Shoulder and Elbow Surgery

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“…The polyethylene insert was modeled using an elastoplastic material model [29]. For input into the finite element model, one set of kinematic and tibial force data was constructed from the synchronized experimental data for each activity.…”

Section: Model Specificationsmentioning

confidence: 99%

The 2011 ABJS Nicolas Andry Award: ‘Lab’-in-a-Knee: In Vivo Knee Forces, Kinematics, and Contact Analysis

D’Lima

Patil

Steklov

et al. 2011

Clinical Orthopaedics &Amp; Related Research

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Background Tibiofemoral forces are important in the design and clinical outcomes of TKA. We developed a tibial tray with force transducers and a telemetry system to directly measure tibiofemoral compressive forces in vivo. Knee forces and kinematics traditionally have been measured under laboratory conditions. Although this approach is useful for quantitative measurements and experimental studies, the extrapolation of results to clinical conditions may not always be valid. Questions/purposes We therefore developed wearable monitoring equipment and computer algorithms for classifying and identifying unsupervised activities outside the laboratory. Methods Tibial forces were measured for activities of daily living, athletic and recreational activities, and with orthotics and braces, during 4 years postoperatively. Additional measurements included video motion analysis, EMG, fluoroscopic kinematic analysis, and ground reaction force measurement. In vivo measurements were used to evaluate computer models of the knee. Finite element models were used for contact analysis and for computing knee kinematics from measured knee forces. A thirdgeneration system was developed for continuous monitoring of knee forces and kinematics outside the laboratory using a wearable data acquisition hardware. Results By using measured knee forces and knee flexion angle, we were able to compute femorotibial AP translation (À12 to +4 mm), mediolateral translation (À1 to 1.5 mm), axial rotation (À3°to 12°), and adduction-abduction (À1°t o +1°). The neural-network-based classification system was able to identify walking, stair-climbing, sit-to-stand, and stand-to-sit activities with 100% accuracy. Conclusions Our data may be used to improve existing in vitro models and wear simulators, and enhance prosthetic designs and biomaterials.

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“…30 Below the von Mises yield point, the material behaved in a purely elastic manner. Beyond yield, the material exhibited strain-hardening behavior.…”

Section: Measurement Of Knee Kinematics and Forcesmentioning

confidence: 99%

“…The true stress-strain behavior in uniaxial tension and compression including the yield criterion were obtained from published data. 30 Contact stresses and contact area were computed for level walking, stair climbing, and for static high flexion activities (kneeling and lunge) as described below.…”

Section: Measurement Of Knee Kinematics and Forcesmentioning

confidence: 99%

In vivo contact stresses during activities of daily living after knee arthroplasty

D’Lima

Steklov

Fregly

et al. 2008

Journal Orthopaedic Research

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ABSTRACT:We implanted an electronic knee prosthesis to measure tibial forces in vivo during activities of daily living after total knee arthroplasty. We used tibial forces and knee kinematic data collected in vivo to calculate contact stresses using finite element analysis. The polyethylene insert was modeled as an elastoplastic material, and predicted contact stresses were validated using pressure sensitive sensors. Peak contact stresses generated during walking were similar but about 18% lower than those calculated for International Standards Organization (ISO)-recommended wear simulation conditions. Stair climbing generated higher contact stresses (32 MPa) than walking (26 MPa). However, both high flexion activities (lunge and kneel) generated even higher contact stresses, with the lunge activity generating the highest stresses (56 MPa). The activities that generated high contact stresses also resulted in high equivalent plastic strain. However, the lunge activity generated dramatically higher plastic equivalent strain than the other activities. In vivo measurement of kinematics, forces, and contact stresses may be used to develop more clinically relevant wear simulator protocols. Contact stresses generated during high flexion activities were substantially higher and were largely due to the reduced contact area in deep flexion rather than due to an increase in contact forces. Our results support the use of ''high flexion'' designs that improve contact conditions and preserve contact area at high flexion angles. ß

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The yielding, plastic flow, and fracture behavior of ultra-high molecular weight polyethylene used in total joint replacements

Cited by 137 publications

References 0 publications

Influence of glenohumeral conformity on glenoid stresses after total shoulder arthroplasty

Influence of glenohumeral conformity on glenoid stresses after total shoulder arthroplasty

The 2011 ABJS Nicolas Andry Award: ‘Lab’-in-a-Knee: In Vivo Knee Forces, Kinematics, and Contact Analysis

In vivo contact stresses during activities of daily living after knee arthroplasty

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