Influence of conformity on the wear of total knee replacement: An experimental study

Brockett, Claire; Carbone, Silvia; Fisher, John; Jennings, Louise

doi:10.1177/0954411917746433

Cited by 32 publications

(31 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Galvin et al performed a wear test on different conformity designs and found that lower conformity prostheses provided higher contact stresses and smaller contact areas but lower levels of UHMWPE wear. The same results were found by Brockett et al ., who performed a wear test on prostheses with two different degrees of conformity. The authors thought that the higher degree of tibiofemoral conformity would trap the third‐body debris within the prosthetic joint, leading to more severe joint surface damage, and that the constraints of the joint would generate secondary stresses to promote fatigue wear.…”

Section: Discussionmentioning

confidence: 99%

“…The same results were found by Brockett et al ., who performed a wear test on prostheses with two different degrees of conformity. The authors thought that the higher degree of tibiofemoral conformity would trap the third‐body debris within the prosthetic joint, leading to more severe joint surface damage, and that the constraints of the joint would generate secondary stresses to promote fatigue wear. In contrast to the total knee prostheses used in the aforementioned studies, our prosthesis has a highly constrained design that hinders motion and leads to a high contact stress zone.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Congruency Design on the Contact Stress of a Novel Hinged Knee Prosthesis Using Finite Element Analysis

Zhang

Tian²,

Ren

et al. 2020

Orthopaedic Surgery

View full text Add to dashboard Cite

Objectives: To investigate the contact stress and the contact area o tibial inserts and bushings with respect to different congruency designs in a spherical center axis and rotating bearing hinge knee prosthesis under gait cycle loading conditions using finite element analysis.Methods: Nine prostheses with different congruency (different degrees of tibiofemoral conformity and different distances between the spherical center and the bushing) designs were developed with the same femoral and tibial components. The models were transferred to finite element software. The peak contact stresses and contact areas on tibial inserts and bushings under the gait cycle loading conditions were investigated and compared.Results: For tibial insert, the peak contact stress was the highest in the low conformity-long group (61.4486 MPa), and it was 1.88 times higher than that in the group with the lowest stress (moderate conformity-short group, 32.754 MPa). The contact area was the largest in the low conformity-long group (420.485 mm 2 ), and it was 1.19 times larger than that in the group with the smallest area (moderate conformity-middle group, 352.332 mm 2 ). For bushing, the peak contact stress was the highest in the high conformity-long group (72.8093 MPa), and it was 3.21 times higher than that in the group with the lowest stress (high conformity-short group, 22.6928 MPa). The contact area was the largest in the low conformity-short group (2.41 mm 2 ), and it was 2.27 times larger than that in the group with the smallest area (high conformity-middle group, 1.063 mm 2 ). Conclusion:The results of our study showed that the congruency of the tibiofemoral surface and bushing surface should be considered carefully in the design of the spherical center axis and rotating bearing hinge knee prosthesis. Different levels of contact performance were observed with different congruency designs. In addition, the influence of contact stress and contact area on the polyethylene wear of rotating hinge knee prostheses should be confirmed with additional laboratory tests.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of Congruency Design on the Contact Stress of a Novel Hinged Knee Prosthesis Using Finite Element Analysis

Zhang

Tian²,

Ren

et al. 2020

Orthopaedic Surgery

View full text Add to dashboard Cite

show abstract

“…Less conforming designs with smaller contact area can generate higher peak contact stresses, leading to excessive delamination and failure . In contrast, more conforming designs can reduce peak contact stress; but can lead to increased stresses at the component‐bone interface, increasing the risk of loosening .…”

mentioning

confidence: 99%

“…Conflicting results have been reported on the correlation between polyethylene wear and metal–polyethylene congruency. Several studies have suggested increased wear with reduced conformity; while other studies have shown opposite trends . This may well be because polyethylene wear depends on multiple other factors such as sterilization method, component thickness, sliding distance, cross shear, and material properties.…”

mentioning

confidence: 99%

Computational Model Validation of Contact Mechanics in Total Ankle Arthroplasty

Dharia

Snyder

Bischoff

2019

Journal Orthopaedic Research

View full text Add to dashboard Cite

Revision rates in total ankle arthroplasty (TAA) are nearly double compared with hip or knee arthroplasty procedures. Contact mechanics for metal-polyethylene articulation in TAA is critical due to the reduced size of the implant and higher expected load, compared with a hip or knee joint. This study was focused on developing a validated computational model to predict contact area in a polyethylene tibial bearing articulating with a metallic talar component in a bicondylar TAA design. Contact area was evaluated at five different flexion angles in an experimental test and in a computational model, per ASTM F2665. The overall contact area values predicted in the computational model matched closely (within 8%) with that measured in the comparator; well within the range reported in the literature. The credibility of the model to sufficiently predict the outputs relative to the experimental data was discussed using the guidelines provided by the recently published ASME V&V 40-2018 standard. Various sensitivities associated with both the model and the comparator, were explored. It was concluded that the validated modeling approach presented in this study demonstrated sufficient accuracy to support the use of modeling for evaluation of contact area of TAA designs.

show abstract

“…Furthermore, the relative sliding of components and higher compressive load can lead to greater implant wear. More conforming implant designs that provide greater knee stabilization have been shown to have significantly lower wear rates (Brockett et al, 2017;Reinders et al, 2014).…”

Section: Muscle Activation Strategies In the Unstable Kneementioning

confidence: 99%

The Effect of Implant Conformity on Muscle Force Requirements in the Implanted Knee

McConnochie¹

View full text Add to dashboard Cite

Implant geometry is a significant factor in determining knee stability and patient satisfaction following total knee replacement (TKR). Ineffective muscle recruitment, impaired joint functionality and increased implant wear are consequences of an unstable knee replacement. Current knee laxity evaluation techniques are limited in their ability to account for the muscular response to knee instability. This study utilizes a subjectspecific lower-body musculoskeletal finite element (FE) model with dynamic muscle loading to evaluate implant laxity during activities of daily living. The effect of varying implant conformity on the muscle forces required to maintain a target kinematic profile during simulated laxity testing were quantified here for the first time. With increasing implant conformity, muscle force requirements to maintain target kinematics were significantly reduced-on average, as implant conformity increased by 0.1, muscle force requirements were reduced by 10.4%. As expected, contact mechanics of the tibiofemoral joint was also altered with implant conformity-increased conformity resulted in higher contact area and lower contact pressure. The strength of correlation between muscle force and implant conformity was shown to be activity-dependent, with more demanding activities showing a stronger correlation between muscle force and implant conformity. This is a unique and, we believe, insightful approach to assessing the effect of implant geometry on musculoskeletal demands and may have significant and sustained impact on prescribed treatment options for knee osteoarthritis. vii TABLE OF CONTENTS THE EFFECT OF IMPLANT CONFORMITY ON MUSCLE FORCE REQUIREMENTS IN THE IMPLANTED KNEE .

show abstract

Influence of conformity on the wear of total knee replacement: An experimental study

Cited by 32 publications

References 46 publications

Influence of Congruency Design on the Contact Stress of a Novel Hinged Knee Prosthesis Using Finite Element Analysis

Influence of Congruency Design on the Contact Stress of a Novel Hinged Knee Prosthesis Using Finite Element Analysis

Computational Model Validation of Contact Mechanics in Total Ankle Arthroplasty

The Effect of Implant Conformity on Muscle Force Requirements in the Implanted Knee

Contact Info

Product

Resources

About