Article

Soft tissue artifact (STA) has been identified as the most critical source of
error in clinical gait analysis. Multiple calibration is a technique to reduce
the impact of STA on kinematic data, which involves several static calibrations
through the range of motion of the joint of interest. This study investigated how
skin markers at the pelvis were displaced in relation to anatomical body
landmarks in multiple static calibration positions. The magnitude and direction
of the pelvic marker displacement was assessed in nine different body positions
including 90 degrees and 45 degrees hip flexion, maximum hip extension, and
pelvic tilt in 20 healthy young adults. ASIS markers were found to be more
susceptible to relative displacement than PSIS markers, with displacement
particularly evident in positions where the hip was flexed (up to 17 mm). A
strong correlation was found between the hip flexion angle and marker
displacement (r(2) = 0.70). While the estimated impact of pelvic STA on gait
kinematics was relatively small, the findings suggest that activities with large
hip flexion would cause larger STA with a greater impact on pelvic kinematics.
The skin surface located over the ASIS differed by a mean of 17 mm between
standing and supine positions, which could affect the inter-ASIS distance and the
location of hip joint center (HJC) by up to 20mm and 10mm, respectively.
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Langue : ANGLAIS