Methods Fifty-seven sacroiliac joints in 31 patients with active AS and 40 sacroiliac joints in 20 volunteers were detected by color power doppler ultrasonography.

• 方法能量多普勒超声检查31例活动期强直性脊柱炎患者的57个骶髂关节和20例健康自愿者的40个骶髂关节。