Multiple gait patterns within the same Winters class in children with hemiplegic cerebral palsy

Area of Science:

• Neurology
• Biomechanics
• Pediatrics

Background:

• Previous research suggested distinct muscle activation patterns for Winters type I (dorsiflexor hypo-activation) and type II (plantarflexor hyperactivation) in hemiplegic cerebral palsy.
• However, the intra-group variability of these muscle activation patterns within the same Winters classification remained unclear.
• Understanding this variability is crucial for effective patient management in hemiplegic cerebral palsy.

Purpose of the Study:

• To investigate whether hemiplegic children within the same Winters classification exhibit consistent muscle activation patterns during gait.
• To explore the diversity of foot-floor contact and muscle activation patterns in hemiplegic children classified by Winters types.

Main Methods:

• Gait data from 38 children with hemiplegic cerebral palsy (16 Winters type I, 22 Winters type II) were analyzed.
• Muscle activation patterns of tibialis anterior and gastrocnemius lateralis were assessed during a 2.5-minute walk test.
• A novel method processed distinct foot-floor contact and muscle activation patterns separately, analyzing frequency-of-occurrence to account for gait variability.

Main Results:

• At least two distinct foot-floor contact patterns were identified within each Winters group.
• Up to 4-5 different muscle activation patterns were documented within each Winters classification.
• No single predominant muscle activation pattern was found specific to either Winters type I or type II.

Conclusions:

• A specific, predominant muscle activation pattern cannot be definitively assigned to a Winters classification group.
• Clinical assessment of hemiplegic children requires analysis of gait signals over an extended period (2-3 minutes).
• Relying on a few subjectively selected gait cycles may not provide a representative picture of the child's overall gait pattern.