Fig. 4
Lower extremity RMS errors negatively correlated with the number of leg markers included in the kinematic analyses. Joint kinematics (angles; left column) errors were best described by a 3rd order polynomial (R2 > 0.98). Knee center errors were also best characterized by a 3rd polynomial (R2 = 0.99; right column), while hip and ankle center errors linearly correlated with the number of leg markers included in the analyses (R2 > 0.98; right column). Boxes show the range of all RMS values and the dark bar indicates the average RMS value. Walking speed did not affect kinematic errors