Michael S. Day, MD, MPhil, FAAOS
Practice: Orthopedic Institute of Pennsylvania
Specialty: Orthopedics
Office locations: Carlisle, PA
Dr. Michael Day, M.D., is a board-certified orthopedic surgeon with subspecialty certification in sports medicine. He earned his undergraduate degree from Georgetown University, a master’s from Oxford University, and his medical degree from Weill Cornell Medical College. He completed orthopaedic surgery residency at NYU Hospital for Joint Diseases and a fellowship in orthopaedic sports medicine at Lenox Hill Hospital.
Dr. Michael Day, M.D., is a board-certified orthopedic surgeon with subspecialty certification in sports medicine. He earned his undergraduate degree from Georgetown University, a master’s from Oxford University, and his medical degree from Weill Cornell Medical College. He completed orthopaedic surgery residency at NYU Hospital for Joint Diseases and a fellowship in orthopaedic sports medicine at Lenox Hill Hospital.
OIP Orthopedic Institute of Pennsylvania | Carlisle
Carlisle, PA 17015
Dr. Michael Day, M.D., is a board-certified orthopedic surgeon with subspecialty certification in sports medicine, practicing in Carlisle, Pennsylvania. Fellowship-trained in orthopaedic sports medicine, his clinical focus includes joint preservation, cartilage restoration, ACL reconstruction, and shoulder replacement.
Dr. Day brings a comprehensive understanding of biomechanics, physiology, and long-term musculoskeletal health to the care of athletes and active individuals. His approach emphasizes durability, performance, and restoring patients to the activities that define their quality of life.
He completed his undergraduate studies at Georgetown University and earned a master’s degree from Oxford University. He received his medical degree from Weill Cornell Medical College, followed by residency training in orthopaedic surgery at NYU Hospital for Joint Diseases. He completed a fellowship in orthopaedic sports medicine at Lenox Hill Hospital in New York, where he worked with the team physicians for the New York Jets and New York Islanders.
Dr. Day is a Fellow of the American Academy of Orthopaedic Surgeons and the author of numerous peer-reviewed research publications. He has also written two books, The Renaissance Mind and The Over 40 Playbook, reflecting his broader interest in performance, resilience, and lifelong health.
His patient-centered philosophy includes thoughtful pain management strategies and minimizing opioid exposure.

Friendly and thorough!
Very friendly and you took the time to answer any questions I had
Very pleased with the results of my nerve decompression surgery. I know he told me that I'll need a year for the nerve to regenerate but im getting around so much better than before surgery .
Very personable and knowledgeable.
Very nice
It was a good visit. I was diagnosed and treated very quickly. DR DAY was friendly, professional , and listened to my concerns. I would have no problem recommending him for treatment.
Wonderful service and very respectful
Very professional and thorough.
Very pleasant and attentive. I will find out on the knowledge soon, I hope.
If u want a kind caring heart that knows there stuff. I’ve seen him on two occasions and asks all the right questions. He cares about helping others and I give him a 10 ⭐️ ⭐️ ⭐️🌟⭐️🌟🌟🌟🌟🌟. He Hhas most definitely has help me with my pain a bit life like he really cares. Thank you Dr Day.