Here's a link to a current study (February 2018) that says
formal PT may not be necessary after PKR. I've read some others.
Scientific studies are difficult to find in internet searches because of the way browsers prioritize search results. Physical therapy providers--most of which skew toward PT being necessary--dominate the results. Our culture is geared toward selling us goods and services, and PT is a service that wants to be used.
And then there are the personal experiences you find on here. Not quite scientific, but genuine. Mine was a hybrid (I did some PT, but refused big chunks of it and most used walking to rehab my knees). It's difficult to avoid having people tell you you are doing it wrong. Take this 8 weeks post-op exchange with my mom, who had her knees replaced years ago:
"You're doing your exercises three times a day?" She is 900 miles away. "Your knee will freeze if you don't do all your PT exactly as they say!"
"You betcha, Mom!" I am no longer doing PT.
"You also have to ride your bike every day, 20 minutes at least," she instructs.
"I do," I lie. "And I walk at least a mile a day." That part is true.
"Walking is easy. You have to do the exercises. They hurt like

, but then your knee won't
freeze. You don't want frozen knees."
"I'm thinking of moving to Florida."
My knees recovered fully (-1/135) and are pain-free. To this day, Mom thinks I was diligent about doing my PT.
