Article

Gait data need to be reliable to be valuable for clinical decision-making. To
reduce the impact of marker placement errors, the Optimized Lower Limb Gait
Analysis (OLGA) model was developed. The purpose of this study was to assess the
sensitivity of the kinematic gait data to a standard marker displacement of the
OLGA model compared with the standard Vicon Clinical Manager (VCM) model and to
determine whether OLGA reduces the errors due to the most critical marker
displacements. Healthy adults performed six gait sessions. The first session was
a standard gait session. For the following sessions, 10mm marker displacements
were applied. Kinematic data were collected for both models. The root mean
squares of the differences (RMS) were calculated for the kinematics of the
displacement sessions with respect to the first session. The results showed that
the RMS values were generally larger than the stride-to-stride variation except
for the pelvic kinematics. For the ankle, knee and hip kinematics, OLGA
significantly reduced the averaged RMS values for most planes. The shank, knee
and thigh anterior-posterior marker displacements resulted in RMS values
exceeding 10 degrees . OLGA reduced the errors due to the knee and thigh marker
displacements, but not the errors due to the ankle marker displacements. In
conclusion, OLGA reduces the effect of erroneous marker placement, but does not
fully compensate all effects, indicating that accurate marker placement remains
of crucial importance for adequate 3D-gait analysis and subsequent clinical
decision-making.
CI - Copyright A(c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS