I cant say its the cause, but I certainly have experienced similar things since starting Spiro. Knees, elbows, and hips, HURT. I can feel a grinding sensation in my hips I never felt before. I'm turning 30 next week, so it seems far too early in life for things like this to be occurring. But, who knows for sure.
Also, note, I do take finasteride as part of my blocking regimen. But, I don't get enough vitamins from my diet. - It's been said that your fat intake(omega-3) should /Increase/ on Spiro. as it helps with better absorption and prevents some side effects.
At this point, ill be willing to try. You might want to give it a try though, and see if it helps.
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On a separate note, ill be switching to dutasteride and CPA, once I move to Australia, prior to orchi. So, I will tell you how it goes and if it improves my joint pain.
It's certainly not a scientific confirmation, but, I share your pain.