Article

Planovalgus deformity is prevalent in cerebral palsy patients, but very few
studies have quantitatively reported differences between planovalgus and normal
foot function. Intersegmental foot kinetics have not been reported in this population. In this study, a three segment (hindfoot, forefoot, hallux) kinematic
and kinetic model was applied to typically developing (n=10 subjects, 20 feet)
and planovalgus (n=10 subjects, 18 feet) pediatric subjects by two clinicians for
each subject. Intra-clinician and inter-clinician repeatability of kinematic
variables have been previously reported. Variability of kinetic outcomes (joint
moments and power) is reported and found to be equally repeatable in typically
developing and planovalgus groups. Kinematic differences in the planovalgus foot
including excessive ankle eversion (valgus) and plantarflexion, reduced ankle
flexion range of motion, and increased midfoot joint dorsiflexion and pronation
reflected the reported pathology. Contrary to clinical expectations no
significant difference was observed in midfoot flexion or ankle eversion ranges
of motion. Kinetic differences in planovalgus feet compared to typically
developing feet included reduced ankle plantarflexion moment, ankle power and
midfoot joint power.
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