Board certified in orthopedic surgery, he specializes in joint replacement, including direct anterior approach to hip replacement, osteoarthritis, rotator cuff surgery and sports medicine. Outside the office, Dr. Gardner is an active golfer, runner and scuba diver. He also enjoys hunting, fishing and archery. No Polyp Left Behind | Randy’s Altru MomentAltru Moments - Published on March 31, 2017For the past six years, Randy Schroder of Minto, North Dakota, has been visiting Altru’s Urology Department for regular six-month check-ups. In 2011 he was diagnosed with bladder cancer and had tumors removed, and has been keeping a close eye on it ever since.