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Identifying the Functional Flexion-extension Axis of the Knee: An In-Vivo Kinematics Study

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  • Li Yin
  • Kaining Chen
  • Lin Guo
  • Liangjun Cheng
  • Fuyou Wang
  • Liu Yang

Abstract

Purpose: This study aimed to calculate the flexion-extension axis (FEA) of the knee through in-vivo knee kinematics data, and then compare it with two major anatomical axes of the femoral condyles: the transepicondylar axis (TEA) defined by connecting the medial sulcus and lateral prominence, and the cylinder axis (CA) defined by connecting the centers of posterior condyles. Methods: The knee kinematics data of 20 healthy subjects were acquired under weight-bearing condition using bi-planar x-ray imaging and 3D-2D registration techniques. By tracking the vertical coordinate change of all points on the surface of femur during knee flexion, the FEA was determined as the line connecting the points with the least vertical shift in the medial and lateral condyles respectively. Angular deviation and distance among the TEA, CA and FEA were measured. Results: The TEA-FEA angular deviation was significantly larger than that of the CA-FEA in 3D and transverse plane (3.45° vs. 1.98°, p

Suggested Citation

  • Li Yin & Kaining Chen & Lin Guo & Liangjun Cheng & Fuyou Wang & Liu Yang, 2015. "Identifying the Functional Flexion-extension Axis of the Knee: An In-Vivo Kinematics Study," PLOS ONE, Public Library of Science, vol. 10(6), pages 1-11, June.
    • Handle: RePEc:plo:pone00:0128877
    DOI: 10.1371/journal.pone.0128877
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