The Scoliosis Research Society (SRS) is an international society that was founded in 1966 with 35 members. It has gained recognition as one of the world's premier spine societies. The SRS has maintained a commitment to research and education in the field of spinal deformities. Strict membership criteria ensure that the individual Fellows support that commitment. Current membership includes over 1,000 of the world's leading spine surgeons, researchers, physician assistants and orthotists who are involved in research and treatment of spinal deformities.
The Scoliosis research society (SRS) has previously described 1) normal sagittal balance as occurring when a plumb line drawn from the centre of the body of C7 lies within ±2 cm of the sacral promontory.