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What is a Right Distal Fusion Level for Prevention of Sagittal Imbalance in Multilevel Posterior Cervical Spine Surgery: C7 or T1?

 Choi, Seung-Jin  ;  Suk, Kyung-Soo  ;  Yang, Jae-Ho  ;  Kim, Hak-Sun  ;  Lee, Hwan-Mo  ;  Moon, Seong-Hwan  ;  Lee, Byung-Ho  ;  Park, Sang-Jun 
 CLINICAL SPINE SURGERY, Vol.31(10) : 441-445, 2018 
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STUDY DESIGN: This was a retrospective cohort study. OBJECTIVE: To evaluate the sagittal alignment and T1 slope after multilevel posterior cervical fusion surgery depending on the distal fusion level; C7 or T1, and find out the appropriate distal fusion level. SUMMARY OF BACKGROUND DATA: The sagittal balance of the cervical spine is known to be affected by cervical lordosis and T1 slope. However, T1 slope is not a constant parameter that can be frequently changed after the surgery. Furthermore, useful studies to help guide surgeons in decision-making as to the most appropriate distal level of fusion for cervical sagittal balance are very limited. MATERIALS AND METHODS: From 2014 to 2015, 50 patients who underwent multilevel posterior cervical fusion surgery were evaluated and followed up for >2 years. Group 1 was composed of 29 patients whose distal fusion level was C7. Group 2 was composed of 21 patients whose distal fusion level was T1. C1-C2 lordosis, C2-C7 lordosis, C2-C7 sagittal vertical axis (SVA), and T1 slope were measured on preoperative and the last follow-up. RESULTS: In group 1, C2-C7 SVA (23.1→30.4 mm, P=0.043) was worsened, and T1 slope (22.3→32.9 degrees, P=0.001) was increased after the surgery. In group 2, no significant change occurred in C2-C7 SVA after the surgery (25.3 →23.6 mm, P=0.648). The last follow-up T1 slope was similar with preoperative T1 slope (22.7→21.8 degrees, P=0.04) in group 2. CONCLUSIONS: This study showed that sagittal alignment became worse after the multilevel posterior cervical surgery when distal fusion level was stopped at C7, which was associated with increase of T1 slope. However, when we extended the distal fusion level to T1, T1 slope was not changed after the surgery. Therefore, sagittal alignment was maintained after the surgery. On the basis of the results of this study, we recommend distal fusion extends to T1. LEVEL OF EVIDENCE: Level III.
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1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Hak Sun(김학선) ORCID logo https://orcid.org/0000-0002-8330-4688
Moon, Seong Hwan(문성환)
Park, Sang-Jun(박상준)
Suk, Kyung Soo(석경수) ORCID logo https://orcid.org/0000-0003-0633-2658
Yang, Jae Ho(양재호) ORCID logo https://orcid.org/0000-0001-7421-2805
Lee, Hwan Mo(이환모) ORCID logo https://orcid.org/0000-0002-5405-3832
Choi, Seung Jin(최승진)
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