Detecting Postoperative Change in Children with Cerebral Palsy: Net Nondimensional versus Body Mass Oxygen Normalization

in Journal of Applied Biomechanics
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The aim of the study is to investigate whether the net nondimensional oxygen utilization scheme is able to detect postoperative improvement in the energy cost of walking in children with cerebral palsy and to compare it with a body mass normalization scheme. We evaluated 10 children with spastic cerebral palsy before and 9 months after equinus deformity surgery. Participants walked at a given speed of 2 km/hr and 3 km/hr on a treadmill. Oxygen utilization was measured, and mass relative VO2 and net nondimensional VO2 were calculated. Coefficient of variation was used for the description of variability among subjects. Postoperatively, gait kinematics normalized and the mass relative VO2 and net nondimensional VO2 showed significant improvement. Net nondimensional VO2 is able to detect postoperative improvement with smaller variability among subjects than body mass related normalization in children with cerebral palsy.

Martin Švehlík (Corresponding Author) is with the Orthopaedic Department for Children and Adults, Charles University Prague, 2nd Medical School, Czech Republic. Kryštof Slabý is with the Department of Rehabilitation and Sports Medicine, Charles University Prague, 2nd Medical School, Czech Republic. Tomáš Trc̆ is with the Orthopaedic Department for Children and Adults, Charles University Prague, 2nd Medical School, Czech Republic. Jir̆í Radvanský is with the Department of Rehabilitation and Sports Medicine, Charles University Prague, 2nd Medical School, Czech Republic.