By Kathryn Doyle (Reuters Health) – A therapeutic program of weight-bearing exercise reduces pain and improves joint function, at least for two to six months, for people with osteoarthritis, according to a review of previous trials. “We had a systematic review for Cochrane from 2008 and 2009, but there were much less articles,” said Dr. Martin Van der Esch, who coauthored the review. Since then, many more studies have been published, and confirm the benefits of exercise for arthritis pain, he told Reuters Health by phone.