1. 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 (December 2011)
DOI: /j.apmr
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

2. Fig 1 Isokinetic device setup.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

3. 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  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

4. 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  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions

5. 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  , DOI: ( /j.apmr )
Copyright © 2011 American Congress of Rehabilitation Medicine Terms and Conditions