In vitro simulation and quantification of wear within the patellofemoral joint replacement

Ellison, Peter; Barton, D.C.; Esler, Colin; Shaw, Daigee; Stone, Martin; Fisher, John

doi:10.1016/j.jbiomech.2008.02.029

Cited by 14 publications

(26 citation statements)

References 25 publications

(43 reference statements)

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“…9 Compared to the location of the wear scar reported by Ellison et al, 23 in our study it was located Images showing the mean height change (in mm) on the patella after four million cycles with oxidised zirconium (OxZr, left) and cobalt-chrome (CoCr, right) femoral components in neutral position (ML, mediolateral; DP, distal-proximal). Images showing the mean height change (in mm) on the patella after four million cycles with oxidised zirconium (OxZr, left) and cobalt-chrome (CoCr, right) femoral components in 5° of internal rotation (ML, mediolateral; DP, distal-proximal).…”

Section: Discussionmentioning

confidence: 57%

“…Nevertheless, the wear rates found in this study were minimal compared to standard tibiofemoral wear rates. Moreover, they were significantly lower than the patellofemoral wear rate first quantified by Ellison et al, 23 who showed a mean wear rate of 3.13 mm 3 /Mcycle (SD 1.78). Also, the maximum change in height after four million cycles was 65% lower in our study than the maximum penetration found by Ellison et al 23 This can be explained by the fact that our maximum input load was less than half their maximum input load (55% lower).…”

Section: Discussionmentioning

confidence: 61%

“…A post hoc power analysis for each comparison confirmed that the study was underpowered. A larger number of samples for each test condition, in combination with higher loads, as used by Ellison et al, 23 might have provided a statistically significant result. However, these significant differences would be small (given the low wear values seen for patellofemoral wear compared with tibiofemoral wear) and it is uncertain that they would be clinically relevant.…”

Section: Discussionmentioning

confidence: 99%

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The influence of malrotation and femoral component material on patellofemoral wear during gait

Vanbiervliet¹,

Bellemans²,

Verlinden³

et al. 2011

The Journal of Bone and Joint Surgery. British volume

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Complications involving the patellofemoral joint, caused by malrotation of the femoral component during total knee replacement, are an important cause of persistent pain and failure leading to revision surgery. The aim of this study was to determine and quantify the influence of femoral component malrotation on patellofemoral wear, and to determine whether or not there is a difference in the rate of wear of the patellar component when articulated against oxidised zirconium (OxZr) and cobalt-chrome (CoCr) components. An in vitro method was used to simulate patellar maltracking for both materials. Both rates of wear and changes in height on the patellar articular surface were measured. The mean rates of wear measured were very small compared to standard tibiofemoral wear rates. When data for each femoral component material were pooled, the mean rate of wear was 0.19 mm3/Mcycle (sd 0.21) for OxZr and 0.34 mm3/Mcycle (sd 0.335) for CoCr. The largest change in height on each patella varied from -0.05 mm to -0.33 mm over the different configurations. The results suggest that patellar maltracking due to an internally rotated femoral component leads to an increased mean patellar wear. Although not statistically significant, the mean wear production may be lower for OxZr than for CoCr components.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of malrotation and femoral component material on patellofemoral wear during gait

Vanbiervliet¹,

Bellemans²,

Verlinden³

et al. 2011

The Journal of Bone and Joint Surgery. British volume

View full text Add to dashboard Cite

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“…The AA rotation (1 o maximum) was based on data from Ellison et al [20], Lafortune and Cavanagh [21] and Halloran et al…”

Section: Methodsmentioning

confidence: 99%

Computational Modelling of Patella Femoral Kinematics During Gait Cycle and Experimental Validation

Maiti

2016

J. Inst. Eng. India Ser. C

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The effect of loading and boundary conditions on patellar mechanics have been greatly important due to the complications arising in patella femoral joints during total knee replacements. To understand the patellar mechanics with respect to loading and motion, a computational model representing the patella femoral joint was developed and validated against experimental A good overall agreement between the computational prediction and the experimental data was obtained for patella femoral kinematics. Good relation between the model and the past studies were observed when the ligament load was removed and the medial lateral displacement was constrained. The model was sensitive to ±5% change in kinematics, frictional, force and stiffness coefficients and insensitive to time step.

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“…The volumetric wear rate for each station was taken from the previously reported studies, which reported an average wear rate of 3.1 mm 3 /MC for the patellofemoral joint, 24 16.4 mm 3 /MC for the FB design tibiofemoral joint and 16.9 mm 3 /MC for the RP design of tibiofemoral joint. 25 …”

Section: Calculation Of Biological Activitymentioning

confidence: 99%

Biological activity of polyethylene wear debris produced in the patellofemoral joint

Ellison

Tipper

Jennings

et al. 2012

Proc Inst Mech Eng H

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Polyethylene wear is considered a threat to the long-term survival of total knee replacements. The aim of this study was to investigate the contribution that resurfacing the patella makes to wear debris-induced osteolysis following total knee replacement. Ultra-high molecular-weight polyethylene wear particles were isolated from simulator lubricant. Particle shape, size, and volume distributions were recorded allowing the osteolytic potential of the wear debris produced in the patellofemoral joint to be estimated using the concept of specific biological activity and functional biological activity. Values were compared with those reported for the tibiofemoral joint. Specific biological activity for the patellofemoral joint was not significantly different from the values for the tibiofemoral joint of total knee replacement devices, and therefore, has a similar potential to stimulate osteolytic cytokine release from macrophages. Functional biological activity was significantly lower for the patellofemoral joint compared with the tibiofemoral joint. Functional biological activity was significantly lower for the patellofemoral joint compared with the fixed bearing and rotating platform total knee replacement devices. However, as patellar resurfacing is commonly fitted as part of a total knee replacement system, this results in a 20% increase in overall functional biological activity for the system. Therefore, implanting a patellar resurfacing will increase the potential for osteolysis in the knee.

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In vitro simulation and quantification of wear within the patellofemoral joint replacement

Cited by 14 publications

References 25 publications

The influence of malrotation and femoral component material on patellofemoral wear during gait

The influence of malrotation and femoral component material on patellofemoral wear during gait

Computational Modelling of Patella Femoral Kinematics During Gait Cycle and Experimental Validation

Biological activity of polyethylene wear debris produced in the patellofemoral joint

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