Dr. David MackDavid Mack, MD, board-certified orthopedic surgeon and sports medicine physician, practices with North Cypress Sports Medicine Center in Houston. Dr. Mack has served as the center's medical director since its inception. He focuses on reconstructive surgery of the shoulder and the knee. Dr. Mack performs procedures at North Cypress Medical Center, Cy-Fair Surgery Center, Methodist Willowbrook Hospital and Wortham Surgery Center.