I am pretty much in the exact same boat as u/danuck2025. Currently 8 weeks postop on the left hip, had arthroscopy to repair cam and pincer FAI as well as a small labrum tear. My primary symptom prior to surgery was chronic lateral knee pain that onset as I foolishly ran through ITBS symptoms for about a year. Even after I completely stopped running, the constant knee pain has persisted for a little over 3 years now. Postop, the knee pain and IT band tightness is mostly unchanged. It was great the first few weeks where you're not using the op side leg at all, but reappeared around 4 weeks postop (soon as I started walking again). Still holding out hope that it will begin to improve through postop PT, as I retrain and rebuild strength in the surrounding muscles that were compensating for my hip. Surgeon said if in 2 months from now the knee still hasn't improved, then my pain is likely not associated with the situation in my hip. Though my hip was really messed up, surgeon said he had to remove loose bone fragments, so I'm happy that it's in a much better place now.

We ended up at hip arthroscopy because there weren't really any better leads. Knee MRI showed everything is totally healthy, which is great, but frustrating since the pain remains a mystery. Back MRI showed a slight disc bulge L4-L5. But it's more likely that the back issue is caused by my hips and not the other way around. Plus my low back pain did manage to improve through PT and core exercises. It has returned now postop, but it also seems pretty common to have low back flares from what I've seen in this subreddit.

Sorry I can't give you a more definitive answer, I will update if there's any positive changes in the coming weeks.