2.6.1. Lordotic Curve
LLA
The LLA and SHA were measured using an Accuray-525R diagnostic X-ray machine (Don Kang Medical System, Seoul, Republic of Korea). Radiographs were captured at distances of 2 m and 50 cm, with the following settings: exposure time, 0.8 s; tube voltage, 90 kVp; and tube current, 200 mA. Images were taken from the sagittal plane covering the pelvis to the lower spine while the subjects maintained an upright and functionally appropriate posture [Lumbar Lordotic AngleThe LLA measures the degree of lumbar curvature, which typically falls within a normal range of 40–50° [Sacrohorizontal AngleThe SHA indicates the degree of sacral tilt with a normal angle of 40° [