Kind of hard to say you'll just do PT when a night of dancing leads to locking the knee at certain points.
At the way it was looking on the display, there is no way I did not have mechanical issues because of it.
It could be that we just cannot discriminate well enough between those for whom it would be a gain in health and those for whom it would be a loss.
An example is the yearly checkup with a GP. It might save your life, but definitely costs time, and also may lead to somewhat risky tests for many. Better selection of those to be tested can make that much more effective.
I did PT before (didn't help, I had mechanical locking) and after (did help).
PT doesn't help some physical issues, but I had shoulder problems that PT fixed 100% and they've stayed fixed for years. IMO, it's important for a physician to treat each case as unique, and start with conservative therapy and move to more invasive measures.
Now I'm doing PT yet again because I have an onset of carpal tunnel syndrome, but it looks like I'll probably be going under the knife for it...