About The Practice At Naples Regenerative Institute, double board-certified pain management specialist and leading regenerative orthopedic medicine physician Glenn Flanagan, MD, offers comprehensive treatments and cutting-edge care in Naples, Florida. If you’re looking for a caring and thoughtful physician who spends time listening to each patient at every visit to organize a customized and individualized plan, look no further. Whether you have neck pain, back pain, or painful joints, rest assured, the team is here to help. In July 2019, Dr.