My right knee used to hurt when I climbed stairs. That’s almost all gone now.
Years of obesity can severely damage our knees and cause arthritis. Weight loss (diet/exercise, like I did; or after stomach surgery) can improve knee function.
But some folks, even though they lose weight, may still benefit from knee replacement surgery. This can often relieve pain, and allow people to dramatically increase their level of function – like my neighbor, Ella!