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

Journal Article

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 results demonstrate the relatively modest effects of patellofemoral overstuffing on knee flexion and patellar tracking kinematics after TKA.

Full Text

Duke Authors

Cited Authors

  • Bracey, DN; Brown, ML; Beard, HR; Mannava, S; Nazir, OF; Seyler, TM; Lang, JE

Published Date

  • September 2015

Published In

Volume / Issue

  • 39 / 9

Start / End Page

  • 1715 - 1722

PubMed ID

  • 25776464

Electronic International Standard Serial Number (EISSN)

  • 1432-5195

International Standard Serial Number (ISSN)

  • 0341-2695

Digital Object Identifier (DOI)

  • 10.1007/s00264-015-2715-9

Language

  • eng