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The pre- and postoperative X-rays of the 66-year-old female patient. (A, B) Preoperative flexion and extension. (C, D) Postoperative flexion and extension. The while lines represent the Cobb angle of the index levels. The range of motion (ROM) is the difference of Cobb angles in flexion and extension. The preoperative ROM of L1–2–3 is 14°. The postoperative ROM of that is 4°.
