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Fig. 2 | BMC Musculoskeletal Disorders

Fig. 2

From: Sustained hip flexion contracture after femoral lengthening in patients with achondroplasia

Fig. 2

Spinopelvic parameters measured on standing radiographs. a Pelvic incidence (PI) was defined as the angle between a perpendicular line to the sacral endplate and a line joining the middle of the sacral endplate and the hip axis. b Pelvic tilt (PT) was defined as the angle between the line joining the middle of the sacral endplate and the hip axis and a vertical line. c Sacral slope (SS) was defined as the angle between the sacral superior endplate and the horizontal plane. d Lumbar lordosis (LL) was measured between the upper endplate of L1 and the upper endplate of S1 by using the Cobb method. e Sagittal vertical axis (SVA) was defined as the horizontal distance between a plumb line dropped from the center of C7 to the posterior-superior corner of S1

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