In an attempt to optimize
seating for children with CP, researchers have created
modular seating systems consisting of a combination of
positional adjustments and positioning components. It has
been suggested that these seating systems allow for a functional
sitting position, in which the users obtain adequate
postural control to maximize their ability to use their upper
limbs.31 Three studies25,29,31 examined the effects of a modular
seating system designed by Myhr and von Wendt. In
the customized seating device, children symmetrically
bore weight on their ischial tuberosities with the line of
gravity of the upper body anterior to the axis of rotation at
the ischial tuberosities. The children’s hips were also fixed
with a belt under the seat, and their thighs were separated
by an abduction orthosis. The seat base itself was either
horizontal or anteriorly tipped.