Whats the topmost point the average man can hop from minus breaking his legs?

10, 20 meters? It would depend on many factor, including:
-height, of course!
-landing surface, frozen of soft?
-way of landing, flat feet, ball of feet?
-strength of bones?
I really don't reckon there is a bearing to say, surely, if you jump from x rank, you will break a bone, but if you jump from single y height, you won't.