Distal femoral condyle is more internally rotated to the patellar tendon at 90° of flexion in normal knees

Shinya Kawahara, Ken Okazaki, Shuichi Matsuda, Hiroyuki Nakahara, Shigetoshi Okamoto, Yukihide Iwamoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background: The configuration of the distal surface of the femur would be more important in terms of the patellofemoral (PF) joint contact because the patella generally contacts with the distal surface of the femur in knee flexion. Some total knee arthroplasty (TKA) designs configurate medially prominent asymmetric femoral condyles. This difference in the design of distal femoral condyle may affect the PF joint congruity in knee flexion. Furthermore, some surgeons advocate a concept aligning the symmetric components parallel to the native joint inclination, not perpendicular to the mechanical axis. This concept would also make a difference on the PF joint congruity at the distal femur in knee flexion. However, no fundamental study has been reported on the PF congruity at the distal femur to discuss the theoretical priority of these concepts. Methods: The open magnetic resonance images of 45 normal knees at 90° of flexion were used to measure the angles between the tibial attachment of the patellar tendon, the equatorial line of the patella, and the distal surface of femoral condyles. Results: The distal surface of femoral condyles was internally rotated relative to the tibial attachment of the patellar tendon and the equatorial line of the patella in all the knees (8.2° ± 3.5° and 5.8° ± 2.5°, respectively), not parallel. Conclusions: Distal femoral condyle is internally rotated to the patellar tendon at 90° of flexion in normal knees. When the symmetric femoral component is aligned perpendicular to the femoral mechanical axis, the patellar tendon would be possibly more twisted than the condition in normal knees, and the deviation of the PF contact force on the patellar component might be caused. The configuration and alignment of the distal condyle of the femoral component can affect the PF joint congruity in knee flexion. In this respect, our results provide important information in considering designs and alignment in the distal femur of TKA and the PF joint congruity in knee flexion.

Original languageEnglish
Article number54
JournalJournal of Orthopaedic Surgery and Research
Volume10
Issue number1
DOIs
Publication statusPublished - Apr 25 2015

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine

Fingerprint Dive into the research topics of 'Distal femoral condyle is more internally rotated to the patellar tendon at 90° of flexion in normal knees'. Together they form a unique fingerprint.

  • Cite this