Sorry to hear that Dave, I slipped off my doorstep just before xmas, the same doorstep I have used numerous times everyday for 9 years (3 cracked ribs).
Anyway and a perfect chance to air this one,
I hate A frames to me they have never seemed safe, 4 points of contact from a normal ladder is much better than 3 with the A frame, sorry but it's just logical.
The same rule applies when you just need that few feet of aided height to reach something....use a step ladder, 4 four points of contact on the ground and a flat ledge to stand on at the top if needed.