Most often a cast or a boot is used.
Swathe
A Swathe
Swathe
Swathe
Swathe
A splint and sling are what immobilize the extremity.
It is called a swath or binder.
Cloth or improvised swathes of fabric. SABC-Swathe
Cloth or improvised swathes of fabric. SABC-Swathe
Cloth or improvised swathes of fabric. SABC-Swathe
Cloth or improvised swathes of fabric. SABC-Swathe
Cloth or improvised swathes of fabric. SABC-Swathe