BIP, hoping no permanent aftereffects. You are lucky to have a good nursing care. A hoist is on hand?
Perhaps you should grant more freedom to your Labrador, then he could rescue you if needed....
Our Labradors are almost never on a leash, they like to forage outside of house perimeter, at least twice a day so happy outside, no need to worry that they would not come back. Good for their exercise and mine either.
In your case of a traffic around your house, perhaps you should always make a short trip by car to a free area nearby and let the dog enjoy the freedom. The garden area is not enough for dogs and too boring when 24/7...