Excessive posterior placement of upper instrumented vertebra relative to lower instrumented vertebra as a predictor of proximal junction kyphosis after selective spinal fusion for adolescent idiopathic scoliosis Lenke type 5C curves

Purpose We defined sagittal S-line tilt (SSLT) as the tilt of the line connecting the upper instrumented vertebra and the lower instrumented vertebra. This study aimed to: (1) examine the correlation between SSLT and proximal junctional angle (PJA) change values, and (2) determine the cut-off value...

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Bibliographic Details
Published in:European spine journal 2024-10, Vol.33 (10), p.3814-3822
Main Authors: Oba, Hiroki, Banno, Tomohiro, Ohba, Tetsuro, Ikegami, Shota, Uehara, Masashi, Mimura, Tetsuhiko, Koseki, Michihiko, Hatakenaka, Terue, Miyaoka, Yoshinari, Kurogochi, Daisuke, Fukuzawa, Takuma, Sasao, Shinji, Matsuyama, Yukihiro, Haro, Hirotaka, Takahashi, Jun
Format: Article
Language:English
Subjects:
Adolescent
Back surgery
Child
Female
Humans
Kyphosis
Kyphosis - surgery
Lumbar Vertebrae - diagnostic imaging
Lumbar Vertebrae - surgery
Male
Medicine
Medicine & Public Health
Neurosurgery
Original Article
Scoliosis
Scoliosis - surgery
Spinal Fusion - adverse effects
Spinal Fusion - instrumentation
Spinal Fusion - methods
Surgical Orthopedics
Thoracic Vertebrae - diagnostic imaging
Thoracic Vertebrae - surgery
Treatment Outcome
Vertebrae
Young Adult
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Summary:Purpose We defined sagittal S-line tilt (SSLT) as the tilt of the line connecting the upper instrumented vertebra and the lower instrumented vertebra. This study aimed to: (1) examine the correlation between SSLT and proximal junctional angle (PJA) change values, and (2) determine the cut-off value of SSLT with respect to proximal junctional kyphosis (PJK) occurrence. Methods Eighty-six consecutive patients (81 female and 5 male; mean age: 15.8 years) with Lenke 5C AIS who underwent posterior selective spinal fusion. Pearson’s correlation coefficients were used to examine the relationship between preoperative SSLT and changes in PJA from preoperative to 2 years postoperative. The impact of SSLT on PJK at 2 years after surgery was assessed using a receiver operating characteristic (ROC) curve. Results We observed a moderate positive correlation between preoperative SSLT and change in PJA (R = 0.541, P  
ISSN:0940-6719
1432-0932
1432-0932
DOI:10.1007/s00586-024-08427-y