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Fig. 1 | BMC Musculoskeletal Disorders

Fig. 1

From: Coronal and sagittal balance in Lenke 5 AIS patients following posterior fusion: important role of the lowest instrument vertebrae selection

Fig. 1

The pre-, 1-year post- and 3-year post-operative X rays of a Lenke 5 AIS patient with final coronal imbalance. Preoperatively, the main lumbar Cobb angle was 78.3° with normal coronal and sagittal balance. Both LEV (L3) tilt and LEV+ 1 (L4) tilt were exceeding to 25°, according to experience in literatures, we extended the fusion to lower level (L5 tilt = 21.5°). At 1 year after surgery, the main lumbar curve has been decreased to 11.9° with a corrective rate of 84.8%. However, the patient performed coronal imbalance with C7-CSVL distance of 28.3 mm. At last follow-up (3 years after), her coronal imbalance had a little improvement with C7-CSVL distance of 21.5 mm, still belong to coronal imbalance. And this time, this patient also performed sagittal imbalance with SVA = 47.8 mm and PT = 0.2°. The possible reasons were her smaller PI value (37°) and simultaneously been fused to L5

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