Leg Length Inequality Clinical Trial
Official title:
Does the Structural Leg-length Discrepancy Affect the Postural Control? Preliminary Study
The structural leg-length inequality caused by the shortening of a segment of an extremity,
results in an altered position of lower limb joints, the pelvis and the spine in static as
well as dynamic conditions. That may induce a disturbance of the postural control.
The objective of this study is to investigate the effect of the structural LLD on the
control of the posture.
The measurement of the weight distribution and the static posturography is performed on the
balance platform Good Balance by Metitur . The device is comprised of the triangular force
platform (800 mm x 800 mm x 800 mm) with electronic system and computer software. The body
weight distribution is evaluated in the upright standing with eyes open, feet placed 20 cm
from each other or narrower in children, with upper extremities in relaxed position by
sides. The individual stands motionlessly for 15 s, then the measurement is recorded. The
results of each lower extremity loading and a difference in weight bearing between
extremities are expressed in percentages (%) .
The static posturography examination is performed with 3 various positions of feet, both
with eyes open (EO) and eyes closed (EC). (1) Position : normal standing - an upright
standing with feet placed parallel 20 cm apart. (2) Position: tandem - a stance with one
foot placed ahead of the other, medial edge of feet was put on the midline of the balance
platform. In the experimental group 2 trials were recorded: (a) foot of the shorter leg in
the front, (b) foot of the shorter leg in the rear. In the control group also 2 trials are
performed: (c) foot of the right leg in the front, (d) foot of the left leg in the front.
(3) Position: one leg standing: stance on the one leg, foot placed 10 cm from midline of the
platform, the other - 90 degrees flexion of the knee and the hip, test performed only with
EO. Every participant is supposed to stand motionlessly for 30 s in normal standing , or for
20 s in tandem .and one leg standing position. Conditions of the posturographic examination
involved : quiet and normally lit room , standing barefoot , the eyesight directed at a
point in the distance of 2 m , glasses or contact lenses are worn if they are normally
needed, arms held in the front of the body with hands together in order to limit movements
of upper extremities . The recording is initiated when a stable position is attained . Each
test is performed once .
Mean velocity (mm/s) of COP sway is measured as a quantitative parameter of the postural
control assessment . Mean COP sway velocity is recorded both in anteroposterior (AP) and
mediolateral (ML) directions .
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