Question

it is used when bone in the body cracks or breaks​

Answer 1

Answer:

Most broken bones are treated with a cast, splint, or brace. This keeps the broken bone from moving while it heals. Even broken bones that don't line up (called displaced) often will heal straight over time. Sometimes the displaced bones need to be put back in place before the cast, splint, or brace is put on.

Answer 2

Answer:

Brace, cast and splint ....

This may help you