I have ehlers-danlos hypermobility syndrome, so dislocate fairly frequently. I had a really bad knee dislocation in October last year, had MRI and knee in a brace for a bit and was told by the consultant that no amount of physio would fix me, so I have just undergone a reconstruction, tendon graft and chondroplasty to fix it. I had pain from the injury, but I always have joint pain so was harder to distinguish which was caused by what.
I would perhaps request a referral to an orthopedic surgeon who can assess you and see what the deal is.