Influence of Total Knee Arthroplasty on Patellar Kinematics and Patellofemoral Pressure

Hidenori Tanikawa, Mitsunori Tada, Kengo Harato, Kazunari Okuma, Takeo Nagura

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


Background Patellofemoral complications are one of the main problems after total knee arthroplasty (TKA). The design of the TKA component may affect the patellar biomechanics, which may be associated with this postoperative complication. The purpose of this study was to assess the influence of TKA and prosthesis designs on the patellar kinematics and patellofemoral pressure. Methods Using fresh-frozen cadavers, we measured the patellofemoral pressure, patella offset, and patella tilt in the following 4 conditions: normal knee (patella replacement only), cruciate-retaining TKA, condylar-stabilizing TKA, and posterior-stabilized TKA. Results The patellofemoral pressure increased significantly after the cruciate-retaining TKA and condylar-stabilizing TKA compared with the normal knee. The patella offset in the normal knee decreased with increasing knee flexion angles, while the patella offset in the TKA knees did not change significantly through the full range of motion. The amount of lateral patella tilt in the normal knee was significantly larger than the TKA knees in the full range of motion. Conclusion Although the femoral components are designed to reproduce an anatomical patellar tracking, the physiological patellar kinematics were not observed. Relatively high patellofemoral pressure and kinematic change after TKA may be associated with postoperative complications such as the anterior knee pain.

Original languageEnglish
Pages (from-to)280-285
Number of pages6
JournalJournal of Arthroplasty
Issue number1
Publication statusPublished - 2017 Jan 1


  • knee biomechanics
  • patellar kinematics
  • patellofemoral pressure
  • prosthesis design
  • total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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