When a cat lands on its feet, its joints will absorb the shock that will be there while landing. When the cats jump from higher heights or fall from higher heights the chances of injury are fewer than when they jump from lower heights. When they fall from higher heights the time they take will be more for landing than from lower heights. That will give them sufficient time to rotate their body and come to the correct position so that they will stand on their feet. But there is no rule that every time they will be safe. Sometimes when they jump from lower heights they will get injured and limp for some time.
Knowledge is power.