Similarity of Center of Pressure Progression during Walking and Jogging of Anterior Cruciate Ligament Deficient Patients

<div><p>Objective</p><p>To evaluate the center of pressure (COP) progression similarity and its change during walking and jogging in Anterior Cruciate Ligament deficient (ACLD) patients.</p><p>Methods</p><p>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).</p><p>Results</p><p>(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).</p><p>Conclusions</p><p>SSCOP can distinguish walking from jogging, and SSCOP of ACLD patients would be different from that of healthy controls.</p><p>The study protocol was approved by the Institutional Research Board of Peking University Third Hospital (IRB00006761-2012010).</p></div

Similarity of Center of Pressure Progression during Walking and Jogging of Anterior Cruciate Ligament Deficient Patients - Fig 1

<p>(a, left) COP trajectory of a right foot during walking (b, right) different COP trajectories normalized in unit scale of a right foot during walking.</p

Illustration on the influences derived from ACL deficiency by comparing with the COP movements of healthy volunteers.

<p>Illustration on the influences derived from ACL deficiency by comparing with the COP movements of healthy volunteers.</p

Comparison on the differences of human COP movements between intrasubject and intersubject.

<p>(a)For healthy volunteers; (b) For ACL-ruptured patients.</p

Re-exhibition the influences derived from ACL deficiency comparing with healthy volunteers under totally 11 conditions.

<p>Re-exhibition the influences derived from ACL deficiency comparing with healthy volunteers under totally 11 conditions.</p

Investigation on human COP movements under the influences derived from motion pattern (walking and jogging).

<p>Investigation on human COP movements under the influences derived from motion pattern (walking and jogging).</p