Thank you Dr. Greenberg! - J.T. Jack Harris was 70 years old when he came to All-Star Orthopaedics for a bilateral knee replacement with Dr. Tsay in 2017. Jack is an avid skier and recently went on a trip with his 41-year-old son John to Crested Butte, Colorado. The first time Jack skied CB was in 1966, and years later it was the place he ....