The advantages of this technique are: (1) decompression of the anterior aspect of the spinal canal is accomplished through posterior surgery, avoiding anterior and posterior surgery; (2) by appropriately changing the orthopedic rotational axis point, adequate orthopedic correction can be obtained while the posterior column of the spinal cord area remains shortened, reducing spinal cord injury; (3) the osteotomy surface is cancellous bone, which is fast-healing. The disadvantage is that the surgical operation is difficult, bleeding is high, and an experienced spinal surgeon is required to perform it. From our experience, the main points of this technique are to preserve the posterior structures of the vertebrae or the medial wall of the pedicle during osteotomy to avoid injury to the spinal cord or nerve roots during operation; the lateral wall of the vertebrae should be sufficiently ground like an eggshell or truncated to close the cavity smoothly; and the residual posterior wall should be removed using special instruments or angled biting forceps to avoid injury to the spinal cord. The eggshell technique is a surgical method of last resort and should be performed with full consideration of its difficulty and risk.