Question

generally, musculoskeletal injuries are not life threatening. you should call 9 - 1 - 1 or the local emergency number immediately, however, if which one of the following conditions exist?
the person can walk but is in some pain.
you see or suspect a fracture or dislocation.
the injury involves the middle portion of the leg.

Explanation:

Fractures or dislocations can lead to severe complications like nerve or blood - vessel damage if not treated promptly. While pain during walking (first option) is common in musculoskeletal injuries and not an immediate emergency sign, and an injury to the middle portion of the leg (third option) is too vague to be an automatic emergency. A suspected or seen fracture or dislocation (second option) requires immediate medical attention as it can cause long - term problems if not addressed quickly.

Answer:

You see or suspect a fracture or dislocation.