What question did this study set out to answer?

To examine the reliability of the chin-brow vertical angle (CBVA) in surgical planning for correcting thoracolumbar kyphosis in patients with ankylosing spondylitis.

March 30, 2026

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Is the chin-brow vertical angle always a reliable parameter for surgical planning in the correction of thoracolumbar kyphosis secondary to ankylosing spondylitis?

MCMeng-Han ChangNanjing Drum Tower Hospital BQBang-Ping QianNanjing Drum Tower Hospital YQY D QiuNanjing Drum Tower Hospital

Key Points

To examine the reliability of the chin-brow vertical angle (CBVA) in surgical planning for correcting thoracolumbar kyphosis in patients with ankylosing spondylitis.
Assessment of the relationship between CBVA and surgical planning metrics.
Evaluation of cervical range of motion (CROM) impacts on CBVA reliability.
Studied patients with thoracolumbar kyphosis secondary to ankylosing spondylitis.
CBVA was found to be unreliable for surgical planning in cases of extensive CROM (> 20°).
CROM significantly affected the reliability of CBVA in surgical interventions.

Abstract

For AS patients with thoracolumbar kyphosis, CBVA is not consistently reliable for determining the OVA necessary for deformity correction, with its reliability closely linked to CROM. When the CROM is extensive (CROM > 20°) in patients with AS, the CBVA is not recommended as a reliable parameter for guiding the design of the OVA.

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Is the chin-brow vertical angle always a reliable parameter for surgical planning in the correction of thoracolumbar kyphosis secondary to ankylosing spondylitis?

Key Points

Abstract

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