What is a key difference between static and dynamic orthotic devices?

Static orthotic devices are designed specifically to immobilize or restrict motion in a joint or part of the body. This immobilization can help provide stability and protection to injured areas, promote healing, or correct alignment issues. By limiting motion, static devices can alleviate pain and prevent further injury during the recovery process.

In contrast, dynamic orthotic devices are intended to allow or facilitate movement while still providing support. They often incorporate elements that enable function and mobility, thus differing fundamentally from static devices which prioritize immobilization. The other answer choices, although they touch on characteristics related to weight and cost, do not accurately reflect the primary functional distinction between static and dynamic orthotics, which lies in their capacity to limit or permit movement.