1、 成人严重的僵硬的脊柱畸形，包括冠状位和失状位的畸形。通过截骨最终取得失状位和冠状位的平衡，缓解疼痛，坚固的融合及预防进一步畸形。1、节段性tape1（segmental）:SVA5cm without knee flexion or hip hyperextension Ideal sagittal alignment is described as SVA50 mm,PT 12 cm),sharp,angular kyphosis etl；A wide laminectomy is performed Osteotomy line horizontal to the sacrum Plac
2、ing the temporary rod closed over the rods while the hips and knees are hyperextended Interbody fusion can be done as either a TLIF or an ALIF procedure correction rates 35 to 60 The main indications are deformities with the disc space as the apex or center of rotational axis(CORA)and severe sagitta
3、l plane deformities pedicle screws at least two levels below and three levels above A titanium mesh cage can be placed anteriorly if desired.in 1922 by MacLennan indicated for rigid multiplanar deformities,sharp angulated deformities,emivertebra resections,resectable spinal tumours,posttraumatic deformities,and spondyloptosis.
