Biomechanical Consequences of Patellar Component Medialization in Total Knee Arthroplasty |
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| Authors: | Carolyn Anglin,Jill M. Brimacombe,David R. Wilson,Bassam A. Masri,Nelson V. Greidanus,Jé rô me Tonetti,Antony J. Hodgson |
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| Affiliation: | ? Department of Mechanical Engineering, University of British Columbia, Vancouver, Canada;† Centre for Bioengineering Research and Education, University of Calgary, Calgary, Canada;‡ Department of Civil Engineering, University of Calgary, Calgary, Canada;§ McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Canada;║ Division of Orthopaedic Engineering Research, University of British Columbia, Vancouver, Canada;¶ Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, Canada;# Department of Orthopaedics, University of British Columbia, Vancouver, Canada;?? Department of Orthopaedics and Traumatology, Hôpital Michallon, Grenoble, France |
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| Abstract: | The optimal amount of patellar component medialization in knee arthroplasty is unknown. We measured the impact, on patellofemoral kinematics and contact force distribution, of 0.0-, 2.5-, and 5.0-mm patellar component medialization in 7 cadaveric specimens implanted with knee arthroplasty components. The knees were flexed dynamically in a weight-bearing rig. Medialization led to lateral shift of the patellar bone, slight medial shift of the patellar component in the femoral groove, lateral tilt of the patella, reduced patellofemoral contact force in later flexion, and lateral shift of the center of pressure in early flexion. Effects on shift and tilt were proportional to the amount of medialization. As a result of this investigation, we recommend medializing the patellar component slightly—on the order of 2.5 mm. |
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| Keywords: | total knee arthroplasty patella kinematics tracking contact force center of pressure knee mechanics |
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