The best position for an injured person is to place them on their side, with the knee of their top leg bent just a little, and their top arm placed so that the lower part of their hand is closer to the ground. This is to prevent the person from rolling over on their stomach, or on their back. This stabilizes the patient until help arrives.
An exception to this would be if the person has (or you suspect they have) a neck or back injury. In this case, the person would be place on their back, moving them as little as possible, and securing their head so they can't turn it to either side.
lying still and on back with legs straight
on their back with knees flexed
back
back with knees flexed
On his or her back with his or her knees flexed
On back with knees flexed in
On his or her back with their knees flexed
Casualty on the back with knees bent
On his or her back with their knees flexed
On his or her back with his or her knees flexed
Immediately request medical assistance and transport.
immediately request medical assistance and transport
In the recovery position
If a person has an abdominal wound, you should rest their upper half on your bent knees on the ground.
assess situation for danger