What distinguishes a static orthosis from a dynamic one?

The distinction between static and dynamic orthoses lies primarily in their function and the type of movement they facilitate. A static orthosis is specifically designed to restrict motion in order to stabilize or immobilize a joint or body part. This immobilization is crucial for the healing process, particularly after injury or surgery, as it prevents movement that could exacerbate the condition.

On the other hand, a dynamic orthosis is designed to allow for controlled movement, which can aid in rehabilitation or functional improvement. This type of orthosis typically incorporates mechanisms such as springs or elastic components that provide a certain degree of mobility while still offering support. This controlled movement can help maintain range of motion and promote strength development without compromising stability.

This understanding of motion restriction versus controlled movement is essential for orthotic fitters as they choose the appropriate orthosis based on the patient's needs and treatment goals. The other choices do not accurately describe the primary functional differences between static and dynamic orthoses, particularly regarding their ability to enable or restrict movement.