"undisplaced...eggshell like fractures" seems to me when completely healed should be no problem as far as the integrity of the joint itself; once given the green light by your physicians that it is stable, then i wouldn't concern yourself about it going to pieces on you during activity; your PT will address rom, strength, balance and return to activity so long term i would hope for no deformed gait pattern, nearly full rom and once the hip is solid, i don't see why you couldn't go back to heavy labor or impact activities - i could be wrong though