Three geometries of volar slab plaster cast for the stabilisation of wrist fractures were investigated. It was
found that by moulding reinforcement ridges on the inferior surface of the slab the strength and stiffness
could be doubled with only a 20% increase in weight. It was discovered that to provide the same increase
in strength with a traditional cast the entire thickness of the cast would have to be doubled, with a 100%
increase in weight that would be cumbersome to most users. Bending theory is presented in a simple
manner to allow clinicians to understand how reinforcement mouldings can improve the strength and
stiffness of plaster casts without adversely influencing weight, or cost.