I am undergoing prolotherapy now. In 2 weeks time I will have fourth injection. I do feel improvement, it skips much less but is still painfull. My SC joint is a bit lower than the healthy one and I am thinking about mobilisation or manual manipulation to enncourage it into correct position. Something skips in my arm as well and it certainly is connected with the problem in SC joint (started together) but MRI shows nothing abnormal in my shoulder. I whish it had never happened but well.....If you had such possibility try prolo it seems to work.