1993...pathological fracture of Humerous head. Bone died from elbow to shoulder. No idea why. Replaced with donor bone. Dr Irwin exuded confidence and that made me confident in him. He was right, no cancer! 6 mos of unemployment through entire process of healing was worth it. 22 years later, I feel great! All thanks to Dr. Patrick Mitchell for sending me to my hero, Dr. Ron Irwin.