The Effect of an Augmentation Patella Prosthesis Versus Patelloplasty on Revision Patellar Kinematics and Quadriceps Tendon Force: An Ex Vivo Study
Received 19 March 2007; accepted 7 September 2007. published online 14 April 2008.
Abstract
The purpose of this study was to assess the effect of 2 revision reconstructive interventions on patellofemoral joint mechanics in comparison to control. We flexed 8 cadaver knee specimens from 0° to 60° of flexion in a test rig designed to simulate weight-bearing flexion and extension (Oxford rig). Quadriceps tendon extensor force and patellar kinematics were recorded for control total knee arthroplasty (TKA) (normal primary TKA with patella resurfaced) and then for each of the 2 revision patellar interventions (after patelloplasty of typical revision knee patellar bone defect to leave a simple bony shell, and after TKA with augmentation patella resurfacing). Our results demonstrate that patellar kinematics and quadriceps extensor force are optimized when the patella is reconstructed to normal anteroposterior thickness.
⁎Department of Orthopaedics, University of British Columbia, Vancouver Hospital and Health Sciences Centre, Vancouver BC, Canada
†Division of Orthopaedic Engineering Research, University of British Columbia, Vancouver Coastal Health Research Institute, Vancouver BC, Canada
Reprint requests: David R. Wilson, DPhil, Division of Orthopaedic Engineering Research, UBC Department of Orthopaedics, Rm. 3114, 910 W 10th Ave., Vancouver BC, Canada V5Z 4E3.
Benefits or funds were received in partial or total support of the research material described in this article. These benefits or support were received from the following sources: Natural Sciences and Engineering Research Council of Canada and Zimmer, Inc, Warsaw, IN.
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