I had a ski injury to my left knee in 1986, partial meniscectomy in 1990 (Dr. Todd Grant), and ACL reconstruction with a cadaver patellar tendon in 1995 (Dr. Rick Ryu). I am now experiencing knee pain and can walk but no longer hike. My orthopedic surgeon in Santa Barbara told me that I need knee replacement; however, I am 57 and do not want two knee replacements in my lifetime. Therefore, I am interested in exploring stem cells as an alternative and to buy me more time, assuming I eventually have knee replacement.