Spyridon Papagiannis, MD is a Specialist in Orthopaedics and Traumatology at the University Hospital of Patras, Greece, where he completed his residency (2019–2025). He earned his MD from the University of Patras in 2016, served as a rural physician in Kyparissia, and fulfilled military service as a medical officer on Lesbos Island. He gained further clinical experience at the “Olympion” General Clinic and trained in pediatric orthopaedics at the “Karamandaneion” Children’s Hospital. Dr. Papagiannis has completed numerous AO Trauma and AO Recon certified courses in Greece and Germany, covering advanced fracture management, total joint arthroplasty, and periprosthetic fracture care. His international exposure includes an observership at Klinikum Passau, Germany, and participation in the HSS–Stavros Niarchos Orthopaedic Seminar in New York. Holding full German Approbation, he is actively involved in teaching medical students and has contributed to several multicenter clinical trials. His research focuses on molecular biomarkers, particularly circulating microRNAs in aseptic loosening after hip arthroplasty. He has authored 14 PubMed-indexed publications. His professional interests include hip and knee arthroplasty and sports medicine. He is fluent in Greek, English, and German and an active member of national and international orthopedic societies.