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A simplified chair device with three-segmental rigid plates for evaluating sagittal alignment with radiography. (A) The chair was designed with a leg rest, a seat, and a seat back comprising three separate parts. The length, width, and thickness of the seat back, seat, and leg rest were 970 × 400 × 20, 500 × 400 × 20, and 450 × 400 × 20 mm, respectively. (B) Prototype of the chair device.
