As you correctly imply, statins are indeed associated with muscle pain and inflammation. However, they are not known to be associated with worsening joint pain. The pain from osteoarthritis comes and goes unpredictably. Since osteoarthritis and high cholesterol (and therefore statin use) are both very common, it is not surprising that sometimes the pain from OA will get worse (or better !) while someone is taking statins.
About Joan Bathon, M.D.
Dr. Bathon was a Co-Deputy Director of the Division of Rheumatology at Hopkins Bayview. She was also the founder and director of the Hopkins Arthritis Center.