He would be in a bad predicament.
Worst case: you die from septicemia from an open fracture or from internal hemorrhage from the bone cutting an artery, else, the bone heals crooked and you walk funny.
The worse compound fractures happen most commonly in the legs. Due to people not staying off the leg and still applying pressure to it make then almost never heal correctly.
You can die
Shallow Earthquakes may happen.
you explode
It depends on what and how debilitating it is
it will eventually heal, but it will be crooked. How crooked it will heal depends upon the severity of the fracture
A Colles fracture happens when you fall backwards and put your weight on your wrist and the radious is broken.
An untreated infection may spread to the lymphatic system (acute lymphangitis ), the lymph nodes (lymphadenitis ), the bloodstream (bacteremia ), or into deeper tissues.
They would soon become unwanted..........you can die
If not treated the person can die and infect others as well.
Yes. That is why you get fracture of neck of the femur in old people.