2013 was a challenging year for me. I had right knee replacement in April and left knee replacement in October. I worked very hard at rehabilitation. I developed some scar tissue behind the left knee patella and I continued to work hard at rehab. I would go 18 miles per day on the exercise bike, walking, and lifting lightweights. In June this year, I completed a two-week trip to Germany hiking in the Bavarian Alps. Both of my knees behaved very well and I was able to complete all the hikes and climbed at least 2,000 steps in castles and church steeples. I still have a small amount of the scar tissue, but it continues to improve. -- David W.