Disc Wedge and Vertebral Body Tilt Angle Below Lower Instrumented Vertebra After Posterior Correction and Fusion in Patients With a Structural Thoracolumbar/Lumbar Curve: A Minimum 5-Year Follow-up. Issue 24 (15th December 2019)

• Record Type: Journal Article
• Authors: Cho, Jae Hwan; Lee, Choon Sung; Lee, Dong-Ho; Hwang, Chang Ju; Park, Jae-Woo; Jung, Hyung Seo; Park, Kun-Bo
• Is Part Of: Spine. Volume 44:Issue 24(2019)
• Publication Date: 2019-12-15
• Subjects: adolescent idiopathic scoliosis -- apical vertebral translation -- disc wedge angle -- lower instrumented vertebra -- pedicle screw system -- posterior fusion -- structural curve -- thoracolumbar/lumbar curve -- trunk shift -- vertebral body tilt angle; Spine -- Abnormalities -- Periodicals; Spine -- Diseases -- Periodicals; Spine -- Surgery -- Periodicals; 616.73005
• DOI: 10.1097/BRS.0000000000003164
• Languages: English
• ISSNs: 0362-2436

Abstract

Abstract : Study Design: A retrospective cohort study. Objective: The purpose of this study was to evaluate the stability of remained lumbar curve by the review of serial changes in L3/L4 disc wedge and L4 body tilt angle in patients with idiopathic scoliosis who underwent posterior-only fusion to L3 lower instrumented vertebra (LIV) for the correction of structural thoracolumbar/lumbar (TL/L) curve for a minimum 5-year follow-up. Summary of Background Data: There has been some debate in the selection of L3 or L4 as the LIV for the correction of structural TL/L curve. However, there is a limited information about the changes in disc wedge or vertebral body tilt angles below the L3 LIV. Methods: Forty-seven patients were included (mean age 16 yr 7 mo, follow-up 8 yr 2 mo). The Cobb angle of the TL/L curve, L3/L4 disc wedge angle, L4 tilt angle, trunk shift (TS), and apical vertebral translation (AVT) were compared preoperatively and at postoperative 5 days, 1 month, 6 months, 2 years, and final follow-up. Results: At postoperative 5 days, Cobb angle of the TL/L curve, L4 tilt angle, and AVT were improved, except TS and L3/L4 disc wedge angle. The L3/L4 disc wedge and L4 tilt angle were most increased at postoperative 6 months and decreased thereafter. L4 tilt angle, AVT, and TS were improved during postoperative follow-up, except L3/L4 disc wedge angle. Finally, Cobb angle of the TL/L curve (11.8° ± 5.1°, P < 0.001), L4 tilt angle (7.6° ± 4.0°, P < 0.001), AVT (19.2 ± 9.3 mm, P < 0.001), and TS (−5.0 ± 10.0 mm, P = 0.041) were improved; however, L3/L4 disc wedge angle (3.3° ± 2.3°, P = 0.442) was not improved compared to the preoperative evaluation. Conclusion: When LIV was selected as the L3, the correction of TL/L curve was maintained in a minimum 5-year follow-up with the improvement of L4 tilt angle, AVT, and TS; however, L3/L4 disc wedge angle may remain. Level of Evidence: 3 Abstract : When lower instrumented vertebra was selected as the L3 in patients with structural thoracolumbar/lumbar curve of idiopathic scoliosis, the coronal alignment was maintained in a minimum 5-year follow-up with the improvement of L4 tilt angle, apical vertebral translation, and trunk shift; however, L3/L4 disc wedge angle may remain.