I know it makes no sense but neither does this. 4 years ago my left SI joint went wonky. However, it started with pain in my right hip, then my right knee hurt worse than ever, then my right foot. Ortho wanted to do lateral release surgery on my knee, podiatrist said I had 2 neuromas in my foot and would probably need surgery, add arthritis to my right hip and left SI joint. Add to that my hips were misaligned, the right hip rotated backwards. I could barely walk , let alone bike, hike or ski. Plus, for years I had this nagging shoulder pain. After 4 months of PT and I was no better. I consulted a second PT who did bike fits because I thought my bike fit had set everything off. Instead of looking at my bike fit he looked at me and found the SI joint issue. Miraculously, everything on the right side settled down and the shoulder pain disappeared. 4 years later no surgeries and no pain. The hip alignment is good and the strength is back in my right hip. The lower body issues are understandable but how the shoulder was affected still amazes me.
There's a saying that "he who looks at the sight of pain is often lost" and it was certainly true in my case.