Three-dimensional upper limb movement characteristics in children with hemiplegic cerebral palsy and typically developing children.
Watch for trunk sway and low shoulder use during reaches—they signal need for upper-limb therapy in kids with hemiplegic CP.
01Research in Context
What this study did
The team watched the kids reach for toys. Ten kids had hemiplegic cerebral palsy. Ten kids had typical development. All were 8 to 14 years old.
Cameras tracked every move in 3-D. Kids wore small reflective balls on the arm, trunk, and shoulder. The task was simple: pick up a toy from a shelf.
What they found
Kids with CP took longer to reach. Their hands moved slower and curved more. They bent their trunk and lifted their shoulder to help.
Typical kids kept the trunk still and used only the arm. The CP group needed twice the time and three times the trunk sway.
How this fits with other research
Chang et al. (2013) used the same 3-D camera idea. They saw curved, slow hand paths in kids with dysgraphia. Both studies show that motion capture spots hidden motor problems.
Gentry et al. (1980) found motor deficits in learning-disabled boys with just a doctor’s exam. Jaspers et al. (2011) now proves the same point with high-tech precision. The old study is not wrong; it is simply less detailed.
Provost et al. (2007) saw motor delays in toddlers with ASD and DD. Ellen’s older CP group shows the pattern continues into the school years. Together, the papers say motor issues are common across many developmental labels.
Why it matters
You can borrow a 3-D camera or even use a cheap tablet app to track reach paths. Look for trunk sway and shoulder hike. These two signs tell you when to add trunk-stabilization drills or shoulder-strength goals to the ABA plan.
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02At a glance
03Original abstract
The aim of this study was to measure which three-dimensional spatiotemporal and kinematic parameters differentiate upper limb movement characteristics in children with hemiplegic cerebral palsy (HCP) from those in typically developing children (TDC), during various clinically relevant tasks. We used a standardized protocol containing three reach tasks (forwards, upwards, and sideways), two reach-to-grasp tasks (with objects requiring different hand orientations), and three gross motor tasks. Spatiotemporal (movement duration, trajectory straightness, maximum velocity, and timing of maximum velocity), as well as kinematic parameters (discrete angles and waveforms of the trunk, scapula, shoulder, elbow and wrist), were compared between 20 children with HCP (age 10.9 ± 2.9 years) and 20 individually age-matched TDC (age 10.9 ± 3.0 years). Kinematic calculations followed the recommendations from the International Society of Biomechanics. Results showed that children with HCP had longer movement durations, less straight hand trajectories, and lower maximum velocities compared to the TDC. Timing of maximum velocity did not differ between both groups. The movement pathology in children with HCP was highlighted by increased trunk movements and reduced shoulder elevation during reaching and reach-to-grasp. We also measured an increased anterior tilting and protraction of the scapula in children with HCP, although differences were not significant for all tasks. Finally, compared to the TDC, children with HCP used less elbow extension and supination and more wrist flexion to execute all tasks. This study reported distinct 3D upper limb movement characteristics in children with HCP and age-matched TDC, establishing the discriminative ability of the measurement procedure. From a clinical perspective, combining spatiotemporal and kinematic parameters may facilitate the identification of the pathological movement patterns seen in children with HCP and thereby add to a well-targeted upper limb treatment planning.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2011.07.038