Analysis of Isometry of the Anterior Cruciate Ligament for Optimal Ligament Reconstruction

전방십자인대의 최적 재건을 위한 등장성 해석

  • 박정홍 (부산대학교 기계설계대학원) ;
  • 서정탁 (부산대학교 의과대학 정형외과) ;
  • 문병영 (부산대학교 동남권부품소재 산학협력혁신사업단) ;
  • 손권 (부산대학교 기계공학부)
  • Published : 2006.04.01


The anterior cruciate ligament (ACL) is liable to a major injury that often results in a functional impairment requiring surgical reconstruction. The success of reconstruction depends on such factors as attachment positions, initial tension of ligament and surgical methods of fixation. The purpose of this study is to find isometric positions of the substitute during flexion/extension. The distance between selected attachments on the femur and tibia was computed from a set of measurements using a 6 degree-of-freedom magnetic sensor system. A three-dimensional knee model was constructed from CT images and was used to simulate length change during knee flexion/extension. This model was scaled for each subject. Twenty seven points on the tibia model and forty two points on the femur model were selected to calculate length change. This study determined the maximum and minimum distances to the tibial attachment during flexion/extension. The results showed that minimum length changes were $1.9{\sim}5.8mm$ (average $3.6{\pm}1.4mm$). The most isometric region was both the posterosuperior and anterior-diagonal areas from the over-the-top. The proposed method can be utilized and applied to an optimal reconstruction of ACL deficient knees.


Anterior Cruciate Ligament;Flexion-Extension;Knee Joint;Ligament Reconstruction;Isometry


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