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KMID : 1103720150720060358
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Journal of the Korean Society of Radiology
2015 Volume.72 No. 6 p.358 ~ p.392
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Hip Morphometry of Femoroacetabular Impingement Pattern in Patients with Ankylosing Spondylitis
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Lee Jong-Yoon
Lee Eu-Gene
Choi Jung-Ah
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Abstract
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Purpose : To analyze hip morphometry of femoroacetabular impingement (FAI) pattern in patients with ankylosing spondylitis (AS) and correlate them with sacroiliitis grades.
Materials and Methods : 384 patients with AS were analyzed regarding demographics, radiologic signs of FAI for hip involvement, and sacroiliitis grades. FAI was classified into 3 types according to alpha angle, lateral center-edge angle and pistol grip deformity. Sacroiliitis was graded according to the New York criteria. Prevalence of FAI morphometry types was determined and evaluated for association with sacroiliitis grades. Statistical analysis regarding numerical variables, including age, sacroiliitis score using t-test, sacroiliitis score in three groups using Kruskal-Wallis test and Mann-Whitney U-test, corrected by Bonferroni methods for post hoc analysis was done.
Results : Among 384 patients, 141 (36.7%) had FAI morphometry. Male predominance was found in group with FAI pattern involvement (87.2%) (p = 0.000). Pincer type (20.6%) was the most common. Hip involvement group also showed greater sacroiliitis score (2.49 vs. 1.75, p = 0.000). Combined-type had greater sacroiliitis score compared with others (p = 0.002, 0.003).
Conclusion : FAI morphometry was frequent in hips of AS patients (36.7%), especially pincer type, more frequent in male, and associated with significantly greater grade of sacroiliitis; combined type FAI pattern had greater sacroiliitis score
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KEYWORD
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Ankylosing Spondylitis, Hip, Femoroacetabular Impingement, Radiograph
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