Hi, I just finished cutting part of a tree down and it required a lot of arm extending on the top of my ladder, I was doing this for about 2 hours and my arms (bones) are really sore, I am 51 years old and have an active weekly exercise routine, could this be the on-set of some form of arthritis? I am also on Reandron injections every 3 months due to a testosterone deficiency. Cheers, Mick Barry