Abstract
The purpose of this study is to identify an effective method of support for the standing-up motion of children with cerebral palsy (CP). Experiments revealed remarkable differences in the shank and upper-body motions of children with CP compared with normally developed (ND) children. Shank tilt angles of CP children were smaller and their upper-body tilt angles were larger than those of ND children. The large upper-body tilt compensates for the smaller shank tilt but will cause back pain and/or deformation of the hip joint as they grow. It is therefore imperative to find a method of support to help CP children realize more natural motions (similar to those of ND children) to prevent these problems. The standing-up motion of ND children was adopted as the goal. Experiments identified a similarity in the angular variation between ND children’s upper bodies and shanks; the standing-up motion of children with CP under that condition was then simulated using a two-dimensional four-link model of the human body. As a result of the numerical simulation, shank angles of CP children increased and their upper-body angles decreased from those measured during the experiments, which indicates that the proposed method of support is qualitatively effective at allowing CP children to realize a more natural standing-up motion.
Highlights
Cerebral palsy (CP) is a chronic neurologic disorder caused by a static lesion in the immature brain and is characterized by deficits in movements and postural control
CP resulted in difficulty in anti-gravity motor developments as in sit-to-stand (STS) movement because this movement requires adequate balance control between upper body and lower limbs, while the base of the support changes from a relatively larger area to a smaller area supported by the feet [2, 3]
These results show that CP children have less shank tilt and more upper-body tilt than normally developed (ND) children during the standing-up motion
Summary
Cerebral palsy (CP) is a chronic neurologic disorder caused by a static lesion in the immature brain and is characterized by deficits in movements and postural control. AFO did not change other proximal compensatory patterns of increased trunk forward titling and hip flexion [11] This finding suggests that conventional AFO could not support STS movement fully in terms of coordinated motion between upper body and lower limbs. The primary purpose of this study was to assess the kinetic characteristics of STS movement in children with CP by using 3 dimensional motion analysis system This working gives us a center of mass trajectory during STS to find a suitable control system design in AFO device. The secondary purpose of this study was to clarify how our designed new AFO changes STS movement in children with CP by numerical simulations These findings would help us conduct new AFO device in order to perform STS movement coordinately
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