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Typical case one. (A) Lumbar anterior–posterior X‐ray image. Narrow interlaminar window of L5S1 level. (B and C) The trephine was used for laminoplasty at the safety zone. (D) Resected bone from the safety zone. (E and F) Working cannula was inserted at the safety zone. (G and H) Postoperative CT scan revealed laminoplasty (arrow). (I) S1 nerve root was completely released. (J and K) Preoperative and postoperative MRI showed removal and good decompression of the S1 nerve root and dura.
