[Purpose] This study determined whether the results of the mobility assessment of pelvic
and thoracic rotation (static evaluation), which is often used in clinical settings, are
related to step length asymmetry. Moreover, we identified the postural evaluation of
rotation that may be related to gait asymmetry. [Participants and Methods] We hypothesize
that a certain relationship exists between the static assessments of pelvic rotation and
step length asymmetry. Fifteen healthy adult males participated in static posture and gait
motion analyses using a motion-capture system. The static evaluation was analyzed using
three parameters: pelvic rotation in standing, pelvic rotation with kneeling, and thorax
rotation in sitting. [Results] The relationship between the asymmetric variables obtained
from static evaluation and gait observations demonstrated a significant correlation. The
asymmetric variables of step length and asymmetric variables of thorax rotation in sitting
showed a significant relationship. Furthermore, significant correlations were found
between asymmetric variables of pelvic rotation during gait and asymmetric variables of
step length and between asymmetric variables of pelvic rotation during gait and asymmetric
variables of thorax rotation in sitting. [Conclusion] This study revealed asymmetric
relationships between thorax rotation in sitting test and step length asymmetry in the
gait. Asymmetry in the thorax rotation in sitting may be caused by a gait with biased
pelvic rotation.
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