I'm one year post op.
When I was in the first few months post op period =- I had a lot of weird pains and sensations. I went though a period where I had a weird pain in my knee... then I had a weird pain in my butt.. I can't recall if I had groin pain.. but I do know that there were a few periods where I OVERDID it... and I ended up having "new" pains... or recurrence of pains that had gone away.
each time I would be nervous.. and think I hurt something.. and wonder if I caused some kind of irreparable damage.... there was one time where about 6 weeks I went to Disneyland... maybe a bad idea but I wanted to go because a bunch of family were in town and they were all going. i did take it easy.. took my cane even... even though I was off it... but by the end of the day I know I walked WAY WAY too far. I never went on any hard core rides.. but in retrospect it was too much too soon.
my hip started hurting byh the end of the day.. at 6 weeks . i was feeling GREAT.. adn then after this trip.. I had pain deep in my buttocks... and it didn't go away... I was really nervous. it took almost 2 weeks for it to be gone.. but it did go away.
fast forward to today.. I'm great. no pain.. my operated hip IS better than my non operated hip.. I feel like a million dollars...
my advice is that if YOU think it's worrisome - call your doctor, get an xray.. an MRI.. whatever. (you CAN do an MRI with a hip impalnt.. I had one already to examine my other hip recently)... so don't worry about the MRI doing anytyhing.. but talk to your doctor and follow their advice.
BUT.. don't freak out over every little pain you get. you will get them, and they will go away. I think the implant is so jammed on our bones.. that to knock it loose you'd need to jump off your roof...
the soft tissue can get agitated... even though we feel great shortly after surgery.. all those tissues inside are healing.. and in reality.. it probably takes 6-12 montsh to really be fully healed up.... so take it easy. you have yhour whole life to push it.. take it easy in the beginning and don't let the aches/pains of the healing process panic you.
i found my own healing process to be an up/down process. at tiems I was feeling better...then i'd do too muhc and take a short setback.. but i'd recover.. overall.. it's all uphill.. but you will have ups/downs along the way... keep that in the back of your mind and don't panic about the pains or soreness...
good luck!!!