Abstract:  Stress analysis for the correction of scoliosis with Harrington rod and Luque rod involved calculation of the changes in stress in various thoracolumbar spine segments based on strength theory. After correction with the Harrington rod, the Cobb angle reduced to (49.57±2.79)^◦ and after correction with the Luque rod, the Cobb angle reduced to (39.43±1.94)^◦. The bending and shear stresses of the spine increased significantly with an increase in the Cobb angle (r=0.26, p <0.05). The mean bending stress in the thoracic spine segments (106.62±9.57) MPa was greater than the mean bending stress in the lumbar spine segments (103.19±8.05) MPa. The mean shear stress in the thoracic spine segments (32.80±2.60) MPa was greater than the mean shear stress in the lumbar spine segments (30.95±2.26) MPa. The mean composite stress in the thoracic spine segments and the lumbar spine segments were (123.79±7.52) and (120.78±7.00) MPa, respectively. When the Cobb angle was 62^◦, the composite stress in each segment was higher than the normal human body stress value, with the maximum composite stress occurring in the T7 ∼ T12 segments. These data provide a theoretical basis for the future correction of scoliosis.

Key words: scoliosis, Harrington rod correction, Luque rod correction, stress analysis