Effectiveness and Safety of Preoperative Halo Gravity Traction-Assisted Posterior Spinal Fusion Surgery for Severe and Rigid Scoliosis: A Comparative Matched-Cohort Study

Figure 1

Gravity traction diagram. (a) This patient with severe spinal deformity was treated with gravity traction on a modified wheelchair. (b) The full-spine X-ray examination showed a main curve of 107.2° before traction. (c) After 1 month of HGT treatment, the main curve improved to 100° and the compensatory curve improved to 70°. (d) After 2 months of HGT treatment, the main curve improved to 92° and the compensatory curve improved to 65°. (e) After 3 months of HGT treatment, the main curve improved to 87° and the compensatory curve improved to 61°.