Figure 2.

Schematic diagram of radiographic data acquisition for patients. (A) Frontal and lateral X-ray diagram of the knee. (B) Full-length diagram of the patient’s bilateral lower extremities and a schematic diagram of the HKA angle measurements. (C) Diagram of the patient’s position for DECT. The red arrow indicates the patient’s head position during the examination. (D) Lumbar spine and femoral neck BMD test chart. The yellow box represents the region of interest during DXA testing. (E) Schematic diagram of the patient’s BMD around knee measured by GSI View software. The red circle denotes the region of interest selected during measurement around the knee and the patella.

Abbreviations: BMD, bone mineral density; HKA, hip-knee-ankle angle; DXA, dualenergy X-ray absorptiometry; DECT, dual-energy computed tomography; GSI, gemstone spectral imaging; DF, distal femur, PT, proximal tibia.