When recommending a seating system, one should consider the shape of the seating system and how the shape of the cushion or back will impact the individual's positioning. The spine and pelvis can be supported by more than five different shapes and, if not fitted correctly, will create postural instability. The pelvis and lower extremities can be supported by more than four different shapes that will affect stability. It is important to consider these shapes when accommodating or correcting orthopedic asymmetries. The seating shape may also determine the method of pressure distribution. Lastly, the shape may affect the overall comfort of the individual sitting in the seating system.
The following resource provides a visual for the most common shapes and contours of a seating system, and what the outcomes may be if they are not properly fitted.
Consider protecting the trochanters via offloading or immersion/envelopment.
Trochanters not supported may cause:
Buttocks should be supported while loading femurs for stability. Ischial Tuberosities (ITs) need to be protected during activity.
The buttocks should be supported while maintaining optimal hip angle. Correct height depends on difference in height between ischials and posterior aspect of femur.
Femoral loading stabilizes the pelvis, positions the lower extremities, and redistributes pressure.
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