Zocor and rhumatologist

Great reduction in cholesterol levels! But suddenly I felt absolutely without any energy to perform daily tasks, and, simultaneously both knees were swelling and it was difficult walking. I immediately stopped taking Zocor and went to my heart doctor. He agreed that I had done the right thing. I had also been taking Vioxx for lower back pain for a while. Don't know if there was any interaction.
My heart doctor sent me to a rhumatologist. He said there were no real problems with the knees except some expected osteoarthiritis, indicating a slightly greater wear in the cartledge on the inside of the knee joint versus the outside. He took some fluid from one knee and only recommend I get some physical therapy. I waited about four months before following up on the therapy. The physical therapist told me immediately that my problem was only mechanics...the way I walk and that if I would practice walking properly then I would be OK. I suspect there is some truth to this but the real cause of altered walking in my opinion was the pain from taking Zocor.
Please let me know if you have found solutions to this. I am 58 and otherwise quite healthy.