Can Patellar Tendon Angle reveal sagittal kinematics in total knee arthroplasty?

R. Stagni, S. Fantozzi, F. Catani, A. Leardini

Research output: Contribution to journalArticlepeer-review

Abstract

The Patellar Tendon Angle is strongly correlated with both patello-femoral and tibio-femoral joint kinematics. Thus, the Patellar Tendon Angle might be regarded as a concise indicator of the antero-posterior translation of the femur with respect to the tibia. Twelve subjects, who had undergone total knee arthroplasty, were investigated by video-fluoroscopy during step-up/down. The kinematics at the replaced knee was reconstructed by means of 3D fluoroscopy. The Patellar Tendon Angle and the knee-flexion angle were measured on sagittal fluoroscopic images with software designed for the purpose. The slope of the linear trend of the Patellar Tendon Angle versus knee-flexion angle relationship correlated significantly with the mean (p = 0.001), most anterior (p = 0.001), and most posterior (p = 0.016) position reached by the femur over the tibia. The Patellar Tendon Angle versus knee-flexion angle relationship provides relevant information about the anterior or posterior positioning of the femur over the tibia, but it cannot be interpreted as quantification of the actual antero-posterior translation of the femur over the tibia.

Original languageEnglish
Pages (from-to)949-954
Number of pages6
JournalKnee Surgery, Sports Traumatology, Arthroscopy
Volume18
Issue number7
DOIs
Publication statusPublished - Jul 2010

Keywords

  • Joint function
  • Knee kinematics
  • Patellar tendon
  • Total knee arthroplasty
  • X-rays

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery
  • Medicine(all)

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