Wei Siong, Chua
(2015)
Effects of simulated limb length discrepancy
on the amount of pelvic movement across
different height groups.
Masters thesis, Universiti Sains Malaysia.
Abstract
Introduction and objectives:
Limb length discrepancy causes pelvic tilt and excessive pelvic movement which
subsequently change the biomechanics of hip and spine.
We conducted the study to determine the effects of simulated limb length discrepancies on
pelvic movement throughout the gait cycle in different height groups. It also investigated the
amount of longer limb knee flexion as a form of compensation to simulated limb length
discrepancy
Methodology:
This is a cross sectional study of 30 normal volunteers, with 10 each in height groups of
130,150 and 170 cm. They were made to walk without shoe raise followed by 1, 2, and 3 cm
shoe raise on one side to simulate leg-length discrepancy. The amount of sagittal and coronal
pelvic movement throughout the gait cycle was recorded by 3D cameras via reflective
markers placed on bony pelvic and lower limb landmarks. The amount of pelvic motion was
taken as the difference from the peak and the trough of the pelvic angle graph. The amount of
maximum knee flexion was also assessed in the similar way. The analysis within and
between groups were analysed using repeated measure analysis of variance.
Results:
There were no significant differences in the mean of sagittal (P-0.67) and coronal (P-0.38)
pelvic movement among the individuals with simulated limb length discrepancy between 1
cm to 3 cm . Similar findings were found on volunteers with height between 130 to 170 cm
with a range of simulated limb length discrepancies between 1.9% to 7.7% of the lower limb.
Mean amount of knee flexion (P-0.93) throughout the gait cycle was no different between all
the studied height groups.
Conclusion:
Various simulated limb length discrepancy of 7.7% or less of the lower limb length did not
cause a significant different in amount of coronal and sagittal pelvic motion in subjects
between 130 to 170 cm height. Inconsistent amount of knee flexion as compensation of
different simulated limb length discrepancies indicate that other parts also contribute to the
compensation
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