About Nikolaos Paschos, MD, PhD

Dr. Nikolaos K. Paschos is an experienced pediatric orthopedic surgeon and researcher specialized in sports medicine, with a particular interest in arthroscopic surgery of the knee, hip and shoulder joints, in sport injuries and in regenerative medicine.

Dr. Paschos received his medical degree with honors from the University of Ioannina Medical School, Greece. He completed his residency in Orthopaedic Surgery from the University Hospital of Ioannina, Greece and Thomas Jefferson University. Dr. Paschos completed a fellowship in Orthopedic Sports Medicine at University of Pennsylvania Hospital and Children’s Hospital of Philadelphia, a fellowship in Pediatric Orthopedic Sports Medicine at the Boston Children’s Hospital, and a fellowship in Orthopedic Sports Medicine at the New England Baptist Hospital. Prior to joining MGH, he served as a clinical instructor in Orthopedics at Tufts University School of Medicine.

Dr. Paschos serves as an Associate Editor for the Arthroscopy Journal and he is a member of the American Academy of Orthopaedic Surgeons, Arthroscopy Association of North America, American Orthopaedic Society for Sports Medicine, International Society of Arthroscopy, Knee Surgery and Orthopedic Sports Medicine, and European Society for Sports Traumatology, Knee Surgery and Arthroscopy. He has served in the Executive Board of the European Federation of National Associations of Orthopedics and Traumatology (EFORT) and also as a member of the Steering Board of the EFORT Educational Committee. He has served as president and board member of the Federation of Orthopedic Trainees in Europe. He was the recipient of the Patellofemoral Traveling Fellowship and the International Sports Medicine Fellowship Scholarship.

Dr. Paschos has served as a member of the medical team of sports teams of various levels, including the Boston Celtics, UMass Boston, UPenn Athletics, Merrimack College, Upper Darby and Dexter Southfield Schools.

Clinical Interests:




Children's Orthopaedics Service
55 Fruit Street
Yawkey Center for Outpatient Care
Suite 3E
Boston, MA 02114
Phone: 617-726-8523
Fax: 617-724-0551

Orthopaedics at Mass General Waltham
52 Second Ave.
1st Floor, Suite 1150
Waltham, MA 02451
Phone: 617-726-8523

Mass General Brigham Healthcare Center at Foxborough
22 Patriot Place
Foxboro, MA 02035
Phone: 617-726-8523

Medical Education

  • MD, University of Ioannina - Greece
  • Residency, 7th Social Security Hospital
  • Residency, Ioannina University Hospital Greece
  • Residency, South Infirmary Hospital
  • Fellowship, Boston Children's Hospital
  • Fellowship, Hospital of the University of Pennsylvania
  • Fellowship, New England Baptist Hospital

Accepted Insurance Plans

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.


Dr. Paschos obtained a PhD with honors in Orthopedic and Sports Medicine focusing in ACL anatomy and biomechanics.  He serves as Director of Pediatric Orthopedic Research at MassGeneral Hospital for Children. During his carrier he has worked in several multidisciplinary teams and his work has led to the development of novel surgical techniques and orthopedic devices.

The main objective of Dr. Paschos research is to optimize the management of sports related injuries and conditions, focusing on the Anterior Cruciate Ligament (ACL), meniscus and cartilage, patellofemoral joint, osteochondritis dissecans (OCD), hip labrum and femoroacetabular impingement. He also has a special interest in stem cell, tissue engineering and biomechanics research and it’s application in clinical practice; prospective clinical trials and systematic reviews and meta-analysis; and outcomes regarding patient return to sports and sports performance. He has more than 100 publications and oral presentations in the field, and he is involved in a number of ongoing studies in ACL reconstruction, patellofemoral instability, meniscus repair and transplantation, hip impingement, and shoulder instability. His research has been awarded several awards from the International Society of Arthroscopy Knee Surgery and Orthopedic Sports Medicine, the European Society for Sports Traumatology, Knee Surgery and Arthroscopy, and the World Council of Biomechanics.


  • Select Publications:

    • Surgical and tissue engineering strategies for articular cartilage and meniscus repair. Kwon H, Brown WE, Lee CA, Wang D, Paschos N, Hu JC, Athanasiou KA. Nature Reviews Rheumatology 2019 Sep;15(9):550-570.
    • Outcomes of Meniscus Repair in Children and Adolescents. Yang BW, Liotta ES, Paschos N. Current Reviews in Musculoskeletal Medicine. 2019 Jun;12(2):233-238.
    • Combined Reconstruction of the Medial Patellofemoral Ligament (MPFL) and Medial Quadriceps Tendon-Femoral Ligament (MQTFL) for Patellar Instability in Children and Adolescents: Surgical Technique and Outcomes. Spang RC, Tepolt FA, Paschos NK, Redler LH, Davis EA, Kocher MS. J Pediatric Orthopaedics. 2019 Jan;39(1):e54-e61.
    • Now Is the Time to Discover How and Why Platelet-Rich Plasma Works in Cartilage. Paschos NK. Arthroscopy. 2019 Mar;35(3):977-978.
    • Tension stimulation drives tissue formation in scaffold-free systems. Lee JK, Huwe LW, Paschos N, Aryaei A, Gegg CA, Hu JC, Athanasiou KA. Nature Materials. 2017 Aug;16(8):864-873.
    • Anterior cruciate ligament reconstruction: principles of treatment. Paschos NK, Howell SM. EFORT Open Reviews. 2017 Mar 13;1(11):398-408.
    • Effectiveness of aspiration in knee joint effusion management: a prospective randomized controlled study. Paschos NK, Giotis D, Abuhemoud K, Georgoulis AD. Knee Surg Sports Traumatol Arthrosc. 2014 Jan;22(1):226-32
    • Advances in tissue engineering through stem cell-based co-culture. Paschos NK, Brown WE, Eswaramoorthy R, Hu JC, Athanasiou KA. J Tissue Eng Regen Med. 2015 May;9(5):488-503.

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