Effects of patellofemoral overstuffing on knee flexion and patellar kinematics following total knee arthroplasty: a cadaveric study

International Orthopaedics
Daniel N BraceyJason E Lang

Abstract

The purpose of this study was to test the hypothesis that overstuffing the patellofemoral joint during total knee arthroplasty (TKA) would decrease passive knee flexion and alter patellar kinematics during knee flexion. Ten cadaveric knees were implanted with cruciate-retaining TKAs, and the patellofemoral joint was overstuffed in 2-mm increments with custom-augmented patellar prostheses (+2 mm through +8 mm). Changes to knee flexion, patellar shift, tilt and rotation were measured with an imageless optical-tracking computer navigation system. Knee flexion decreased an average 1.2° with each additional 2 mm of patellar thickness. Compared with control TKA (+0 mm), no significant decrease in knee flexion was detected until the patellofemoral joint was overstuffed with the +8-mm patellar prosthesis. Kinematic tracking data showed significantly greater lateral shift of patella with the +6- and +8-mm prostheses and significantly greater lateral tilt with the +8-mm prosthesis. Overstuffing had no appreciable effect on patellar rotation. Passive knee flexion after TKA is significantly reduced when overstuffing the patellofemoral joint by +8 mm, and patellofemoral kinematics are altered when overstuffing the joint by +6 mm. These resu...Continue Reading

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Citations

May 22, 2018·EFORT Open Reviews·Simon Donell
Nov 30, 2018·Archives of Orthopaedic and Trauma Surgery·Rapeepat NarkbunnamDerek F Amanatullah
Sep 10, 2021·Journal of Orthopaedic Surgery and Research·Mohammad Kamal AbdelnasserYaser E Khalifa
Sep 14, 2021·JBJS Reviews·Michael B HeldH John Cooper

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