Comparison of 3 Different Methods to Analyze Ankle Plantarflexor Stiffness in Children With Spastic Diplegia Cerebral Palsy Sandy A. Ross, PT, DPT, MHS,

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Presentation transcript:

Comparison of 3 Different Methods to Analyze Ankle Plantarflexor Stiffness in Children With Spastic Diplegia Cerebral Palsy Sandy A. Ross, PT, DPT, MHS, PCS, Matthew Foreman, BS, ME, Jack R. Engsberg, PhD Archives of Physical Medicine and Rehabilitation Volume 92, Issue 12, Pages 2034-2040 (December 2011) DOI: 10.1016/j.apmr.2011.06.025 Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 Isokinetic device setup. Archives of Physical Medicine and Rehabilitation 2011 92, 2034-2040DOI: (10.1016/j.apmr.2011.06.025) Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 This stiffness figure includes the 10°/s torque-angle curves for a child with CP (thick line) and TD (thin line). The passive stretch begins with the ankle in full plantarflexion and ends with the ankle in full dorsiflexion. A negative torque value is plantarflexion. The child with TD has greater dorsiflexion range of motion compared with the child with CP. Archives of Physical Medicine and Rehabilitation 2011 92, 2034-2040DOI: (10.1016/j.apmr.2011.06.025) Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 3 Using the same children in figure 2 to determine ankle plantarflexor stiffness using 3 different methods. (A) End-range method: applying the stiffness slope to the end 20° ankle range for each child shows nearly parallel stiffness slopes or no difference between children. (B) Set-range method: applying stiffness slope from 30° to 10° plantarflexion for both children shows an obvious difference in stiffness slopes between children. (C) Linear method: applying the stiffness slope to the linear portion of each child's curve showing a slightly steeper slope for the child with CP. Archives of Physical Medicine and Rehabilitation 2011 92, 2034-2040DOI: (10.1016/j.apmr.2011.06.025) Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 4 Using the same children in figure 2, the linear method shows the MATLAB change point where the curve is no longer linear for each child. Archives of Physical Medicine and Rehabilitation 2011 92, 2034-2040DOI: (10.1016/j.apmr.2011.06.025) Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions