I've been living with the same issues for 10 years. If I ride in car, plane or stand more than 1 hour or sit on hard chair, I get intense charley horses in inner thighs that last 25 minutes of agony and then reoccur for days after. I started reading and Europe has lots of articles on ilopsoas impingement after hip replacement. After years of physical theraphy which ended 15 minutes into each session with charley horses, cortisone shots and just about every other remedy doctors suggested, I am going back to hip surgeon to see if I have an impingement. It seems likely as most of the attacks are positional. It seems most of the specialists I've seen over the years are not familiar with psoa impingement. There are specialized imaging techniques that have to be done. A hip xray is not enough. I'm taking the European articles with me to the hip specialist incase he isn't aware of them. After a 10 year journey of incredible pain and very restricted lifestyle, hope I am on to something.