Final answer:
It is false that a static splint allows limited mobility; its purpose is to immobilize a joint entirely. Joint mobility is inversely related to stability; the mobile shoulder joint is less stable compared to the stable carpal bones.
Step-by-step explanation:
The statement that a static splint is used to allow limited mobility is false. A static splint is designed to immobilize a joint or limb to facilitate healing. For example, the backbone operates with partly movable joints between the vertebrae, which allow only a little movement, but these are not typically targeted by static splints, which are meant to eliminate movement entirely to protect an injured or healing area.
When considering joint mobility and stability, it's true that the more mobile a joint is, the weaker it tends to be due to less structural support. The shoulder joint is an example of a highly mobile joint allowing a wide range of movement but it is less stable and more prone to injury. On the other hand, the carpal bones in the wrist provide a more stable structure with limited motion compared to the shoulder.