My PT suggested that I probably had a hard fall on my left side sometime in my life that caused the joint to lock up.

One symptom that I noticed about 5 yrs ago is that sitting for long periods caused pain. I drove from Cincinnati to Denver and when I got out of the car I had a hard time straightening up and my left glute was very painful. I blamed the car seats. I felt more comfortable with the seats slightly reclined. 3 years ago I tore my right acl skiing and after that I noticed that I was sitting primarily on my left hip. I also sit slightly sideways on my bicycle saddle unless I do my exercises right before I ride which seems to help my alignment.

Things got so bad that I was dragging my right foot when I did a lot of walking. I thought I was going to have to give up all my activities, skiing, biking, hiking, strength training (I'm now easing into this).

When this all started it was my right knee and I thought I was dealing with Chondromalicia! (I was diagnosed with this many years ago and most problems occurred in the right knee) In retrospect, the SI joint most likely has been the problem all along.

Sadly, I think this is an issue a lot of people associate with getting old and they think nothing can be done. I'm so glad I found the right therapist who was able to identify the source of the the pain, help me to understand it and get my life back together.