Optimal chin-brow vertical angle and its application for deformity planning in ankylosing spondylitis kyphosis
SONG Kai
ZHANG Yong-gang
FU Jun
LIU Chao
RAN Bo
ZHANG Guo-ying
ZHENG Guo-quan
CUI Geng
ZHANG Xue-song
MAO Ke-ya
WANG Zheng
WANG Yan
Abstract：Objective To investigate effects of chin-brow vertical angle ( CBVA ) in different ranges on daily life of ankylosing spondylitis ( AS ) patients with cervical ankylosis, so as to determine the optimal CBVA and further provide theoretical basis for osteotomy planning.Methods A total of 25 AS patients with thoracolumbar kyphosis and cervical ankylosis were studied, whose functions and expectations of quality of life ( QOL ) related to visual ifeld were assessed by a questionnaire before and after the surgery. The CBVA was obtained based on lateral photos of the patients in natural standing posture. All the cases (n=50 ) were divided into 6 groups according to the CBVA irrespective of surgery, including group A ( CBVA<0° ), group B ( 0°≤CBVA<10° ), group C ( 10°≤CBVA<20° ), group D ( 20°≤CBVA<30° ), group E ( 30°≤CBVA<40° ) and group F ( CBVA≥40° ). The Kruskal-Wallis test was used to assess differences among all the groups in terms of various items in the questionnaire, and the Mann-Whitney test was used to assess differences between 2 groups.Results In overall evaluation, the optimal expectation value was obtained in group C ( 10-20 ) ° (P<0.05 ), and better expectation value was obtained in group B, C and D ( 0-30 ) ° (P<0.05 ), with no statistically signiifcant differences among the 3 groups. In appearance evaluation, group A, B and C ( <20° ) were better than the other groups both in appearance satisfaction degree and expectation (P<0.05 ), with no statistically signiifcant differences among the 3 groups. In outdoor activities, better functions and expectations were achieved in group A, B, C and D ( <30° ) in most of the items. In indoor activities, group C and D ( 10-30 ) ° were much better in most of the items.Conclusions AS patients with cervical ankylosis have the best QOL related to visual ifeld and are most satisifed with the appearance when 10°≤CBVA<20°.
Keywords：SpondylitisankylosingKyphoplastyOrthopedic proceduresCervical vertebraeThoracic vertebraeLumbar vertebraeThe jaw angle eyebrow
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 732-738 )