Because of my cataclysmically smashed hip, sitting was torture after forty minutes or so, impossible after an hour and a quarter.

因为我髋部粉碎性骨折，坐四十分钟以上就如同是折磨，要坚持七十五分钟简直是不可能做到的事。

You don't want her to smash the other hip.

你不想让她撞坏另一侧臀部。