Kinetic-based indexes for the functional evaluation of gait in diplegic children: a preliminary report

Area of Science:

• Biomechanics
• Pediatric Neurology
• Rehabilitation Medicine

Background:

• Spastic diplegia is a common form of cerebral palsy affecting muscle stiffness, primarily in the legs.
• Accurate classification of spastic diplegia severity is crucial for targeted interventions and prognosis.
• Current classification methods may benefit from objective, quantitative measures.

Purpose of the Study:

• To assess the feasibility of using ground reaction force (GRF)-based indexes to differentiate spastic diplegia severity.
• To identify specific GRF parameters that effectively discriminate between Gross Motor Function Classification System (GMFCS) levels.
• To explore the potential of these indexes for clinical screening applications.

Main Methods:

• A sample of 58 children with spastic diplegia was analyzed.
• Ground reaction forces were measured during gait.
• Stepwise discriminant ordinal regression analysis was employed to identify discriminating variables.
• Indexes related to vertical force ratios and anteroposterior timings were examined.

Main Results:

• A subset of GRF variables, specifically the ratio of braking to propulsive vertical forces and anteroposterior timings, effectively discriminated between spastic diplegia severity levels.
• Parameters assessing bilateral symmetry showed limited discriminatory power.
• The identified indexes were found to be relatively simple to implement.

Conclusions:

• GRF-based indexes, particularly those focusing on force ratios and timing, offer a feasible method for classifying spastic diplegia severity.
• These findings suggest potential for integrating these objective measures into existing gait analysis systems for improved clinical screening.
• Further research may validate these indexes for routine clinical use in pediatric gait assessment.