The Harms Study Group (HSG) is a worldwide cohort of surgeons, with over twenty years of productivity, who perform comprehensive, multi-center, prospective research studies focused on pediatric spinal deformity.


This quality improvement/assessment program is designed to assist in optimizing surgeon performance and improving patient outcomes in Adolescent Idiopathic Scoliosis (AIS) surgery.


HSG shares their research discoveries with colleagues at multiple scientific meetings annually and has produced hundreds of peer-reviewed journal articles. Read some of our full publications for free here.


The Lenke Classification System provides surgeons with a simple, accurate and reproducible way to communicate about scoliosis. Visit our Lenke Calculator page to learn how it works.

The HSG is a worldwide cohort of surgeons. It is comprised of 18 Core Members, 17 Associate Members, and 2 Emeritus Members. Click Here to see who they are and where they are from.


Executive Members

Prospective Scoliosis Database Registry Studies

For over twenty years, the Harms Study Group has been the leading producer of research on spinal deformity treatment in children and adolescents. With the combined efforts from many of our members around the globe, we have created the largest database registry for Adolescent Idiopathic Scoliosis (AIS). Along with our AIS registry, we also have prospective database registries for Celebral Palsy (CP), Scheuermann’s Kyphosis (PSK), and Marfan Syndrome.


  • AIS
  • CP
  • PSK
  • Marfan


  • AIS
  • CP
  • PSK

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