Limb Length Discrepancy and Corticospinal Tract Disruption in Hemiplegic Cerebral Palsy

Area of Science:

• Neuroscience
• Orthopedics
• Pediatrics

Background:

• Hemiplegic cerebral palsy (CP) often involves motor impairments.
• Limb length discrepancy (LLD) is a potential complication in CP.
• The relationship between corticospinal tract (CST) integrity and LLD in hemiplegic CP is not well understood.

Purpose of the Study:

• To investigate the association between CST integrity and LLD in pediatric patients with hemiplegic CP.
• To explore the utility of diffusion tensor tractography (DTI) in assessing LLD in this population.

Main Methods:

• Retrospective study of 92 pediatric patients with hemiplegic CP.
• Limb length measured by anthropometry to calculate LLD.
• CST integrity assessed using DTI, measuring fractional anisotropy (FA) and mean diffusivity (MD).
• Clinical function evaluated using the Functional Level of Hemiplegia scale (FxL), modified Ashworth scale, and manual muscle test (MMT).

Main Results:

• A significant difference in hand LLD was observed (p < 0.05).
• Hand LLD showed significant correlations with CST FA (r = −0.578), MD (r = 0.512), and degree of CST disruption (r = −0.946).
• No significant differences in total upper, total lower, or foot limb lengths between groups.

Conclusions:

• Patients with hemiplegic CP frequently exhibit LLD, particularly in the hand.
• DTI-based CST evaluation may aid in assessing and predicting LLD in hemiplegic CP.
• Further research is warranted to confirm these findings and explore therapeutic implications.