I wish there was someone else on here who has had similar but I feel like no one is really reading this.
I will guarantee other members are reading your thread and posts, but if they don't have any advice, they're not responding.
I've had an issue with my knee since my THR. Initially, this was to the point that I inquired about it two or three times early into my recovery, before my OS recommended an x-ray. There was a minimal amount of arthritic change noted, but not anything worth fretting over I was told, until I was "ninety", hahaha, I had to laugh at that, because we know these changes normally progress.
I know you've heard this before, but the knee can be manipulated rather aggressively during the dislocation process and you may still be dealing with the effects of that. Unless it's keeping you from leading a normal existence, try icing daily with the hope it eventually dissipates, consider, mendogal's, advice above, or schedule a visit with your OS and see if he recommends and x-ray, if he hasn't already. My knee has never been the same, although seven years later,
vastly improved to the point it rarely ever bothers me, or holds me back from any activity I want to engage in. Like you, I had no prior issues with my knees, nor did I limp excessively pre-op. However, I did limp if I was on my feet too long, or walked too much.
I hope you have a nice weekend, Law!
@Law