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. 2020 Mar 25;26:e919888-1–e919888-12. doi: 10.12659/MSM.919888

Figure 4.

Figure 4

The sagittal range of motion. The sagittal range of motion is the angle (A) of the intervertebral space measured on the X-ray film in the lumbar hyperflexion position. The angle (B) of the intervertebral space is measured on the X-ray film in the lumbar hyperextension position. The sagittal range of motion is the absolute value of angle A–angle B.