目的 探讨CT诊断强直性脊柱炎 的临床效果，评价其应用价值。方法 选 取2013年3月-2015年3月我院骨外科收治 的64例直性脊柱炎患者，按诊断方法不同 定义为对照组(32例，X线诊断)，观察组 (32例，CT诊断)，对比两组患者的病变征 象检出率及影像学表现。结果 观察组关 节强直、关节面骨质硬化、关节相邻软组 织肿胀、关节间隙增宽、关节间隙狭窄、 关节面下骨质囊变、关节面侵蚀等病变征 象检出率均显著高于对照组(P＜0.05)， 差异有统计学意义；CT诊断图像清晰度较 X线更高。结论 CT诊断强直性脊柱炎敏感 性强、图像清晰，可准确检出病变，为临 床制定合适治疗方案提供科学依据。

Objective To explore clinical efficacy of CT in the diagnosis of ankylosing spondylitis and to evaluate its their application value. Methods Sixty four patients with ankylosing spondylitis admitted by the Bone Surgery Department of the Hospital from March, 2013 to March, 2015 were defined into the control group (n=32, X-ray diagnosis) and observation group (n=32, CT) according to different diagnostic methods, and the detection rate of lesion signs and imaging findings of two groups of patients were compared. Results The detection rates of lesion sign of ankylosis, osteosclerosis of articular surface, adjacent soft tissue swelling of joints, joint gap widening, joint space narrowing, cystic sclerotin degeneration underneath articular surface and articular surface erosion were significantly higher than such indexes of patients in the control group (P<0.05), the differences were statistically significant. The resolution of CT diagnosis image was higher than that of X-ray image. Conclusion CT is characterized with strong sensibility and clear image in the diagnosis of ankylosing spondylitis, and it is capable of accurately detecting lesions and providing scientific evidences for clinical development of appropriate treatment plans.