title: Similarity of Center of Pressure Progression during Walking and Jogging of Anterior Cruciate Ligament Deficient Patients.
abstract: OBJECTIVE
  To evaluate the center of pressure (COP) progression similarity and its change during walking and jogging in Anterior Cruciate Ligament deficient (ACLD) patients.
  
  
  METHODS
  A study was performed in 64 unilateral ACLD subjects and 32 healthy volunteers who walked and jogged on footscan® system at a self-selected speed. COP trajectory during walking and jogging was calculated. The robustness and similarity scores of COP (SSCOP, similarity scores with respect to corresponding COP trajectories) were computed, and then the Analysis of Variance test was employed to compare among different conditions (left or right side, within a subject or between subjects, walking or jogging).
  
  
  RESULTS
  (1) During the same motion status (walking or jogging), SSCOP were higher than 0.885. However, SSCOP between walking and jogging were lower than 0.25 in both the healthy and ACLD group. SSCOP between the intrasubjects were statistically higher than those between the intersubjects (p<0.01). (2) SSCOP in the ACLD group were statistically significantly reduced to 0.885±0.074 compared to 0.912±0.057 in healthy volunteers during walking, and 0.903±0.066 in the ACLD group compared to 0.919±0.050 in the healthy group during jogging (p<0.01).
  
  
  CONCLUSIONS
  SSCOP can distinguish walking from jogging, and SSCOP of ACLD patients would be different from that of healthy controls. The study protocol was approved by the Institutional Research Board of Peking University Third Hospital (IRB00006761-2012010).
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, Beijing, People's Republic of China.
authors.forename: Hongshi
authors.initials: H
authors.lastname: Huang
authors.affiliation: Key Laboratory of Machine Perception (Ministry of Education), Speech and Hearing Research Center, and Department of Machine Intelligence, School of Electronic Engineering and Computer Science, Peking University, Beijing, People's Republic of China.
authors.forename: Jianwei
authors.initials: J
authors.lastname: Qiu
authors.affiliation: Key Laboratory of Machine Perception (Ministry of Education), Speech and Hearing Research Center, and Department of Machine Intelligence, School of Electronic Engineering and Computer Science, Peking University, Beijing, People's Republic of China.
authors.forename: Tianlin
authors.initials: T
authors.lastname: Liu
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, Beijing, People's Republic of China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, Beijing, People's Republic of China.
authors.forename: Qinwei
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Key Laboratory of Machine Perception (Ministry of Education), Speech and Hearing Research Center, and Department of Machine Intelligence, School of Electronic Engineering and Computer Science, Peking University, Beijing, People's Republic of China.
authors.forename: Dingsheng
authors.initials: D
authors.lastname: Luo
authors.affiliation: Institute of Sports Medicine, Peking University Third Hospital, Beijing, People's Republic of China.
authors.forename: Yingfang
authors.initials: Y
authors.lastname: Ao
mesh_terms: D000328:Adult; D000465:Algorithms; D000070598:Anterior Cruciate Ligament Injuries / Q000175:diagnosis* / Q000503:physiopathology*; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007590:Jogging; D007593:Joint Instability; D007719:Knee Joint; D008279:Magnetic Resonance Imaging; D008297:Male; D008962:Models, Theoretical; D011312:Pressure; D016059:Range of Motion, Articular; D016138:Walking; D055815:Young Adult