Sidsel Fruergaard, Mohit J. Jain, Lorenzo Deveza, David Liu, John Heydemann, Søren Ohrt-Nissen, Casper Dragsted, Martin Gehrchen, Benny Dahl

April 2020, Volume 29, Issue 4, pp 744 - 753 Original Article Read Full Article 10.1007/s00586-019-06241-5

First Online: 04 December 2019


The purpose of the present study was to validate a new spinal sagittal classification.


We retrospectively included 105 consecutive AIS patients who underwent posterior spinal fusion. Preoperative long-standing EOS radiographs were available on all patients. Patients were classified according to the four suggested sagittal patterns: type 1, 2a, 2b or 3. Several predetermined sagittal parameters were compared between the groups.


The mean preoperative Cobb angle was 64° ± 12°, and 73% of the patients were female. Of 105 patients, 51 were type 1, 14 were type 2a, one was type 2b and 39 were type 3. The distribution of the four sagittal patterns was significantly different compared with the original publication (p 


The distribution of the four sagittal patterns varies between AIS cohorts. Type 2b was rare, which limits the clinical applicability. Contrary to the original publication, we found that the spinopelvic parameters lumbar lordosis, pelvic incidence and sacral slope were significantly different between the Abelin-Genevois types. Hence, the corrective surgical strategy may need to incorporate these spinopelvic parameters to achieve a balanced spine requiring a minimum of energy expenditure.

Graphic abstract

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