yoshi-
There are certain knee problems that biking can also aggravate.
Nevertheless, the fact that it is a more gentle circular motion, rather than the up-and-down pounding motion of running and jogging means many people who shouldn’t run can still bike.
This includes people with ankle, foot and hip issues as well as shin splints (microfractures) that may be unable to run, but can use a bike or Stairmaster.
I agree of course that good shoes will minimize the pounding and wear-and-tear / injuried that can occur if one is not properly prepared.