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Introduction: Bjurei's equation has been used for height correction in scoliosis patients for decades. A significant controversy on the accuracy of height correction, however, was found in patients with severe scoliosis.
Objectives: To investigate the effectiveness of Bjurei's equation in height correction in scoliosis patients with large Cobb angle.
Methods: 77 patients with adolescent idiopathic scoliosis (AIS) (male 11, female 66) underwent correction surgery were recruited. Standing height (SH) and arm span were measured before and after operation. Pre- and post-operative posteroanterior radiograms of standing whole spine were taken and Cobb angle of main curve was measured. SH was corrected by either arm span (SHa) or Bjurei's equation (SHb). The pre-operative SHb was compared with SHa and postoperative SHb by Students t test. The association between the pre- and postoperative SHb difference (▵SHb) and Cobb angle was plotted.
Results : The SHa was similar as SH in all subjects but significantly lower than the pre-operative SHb. Similar pre- and post-operative SHb was found in patients with Cobb angle<60°. In patients with Cobb angle >60°, however, the difference (▵SHb) increased with the increase of Cobb angle (figure 1).
Conclusion : The SHa calculated by arm span equation selected may not show the real SH of AIS subjects. Bjurei's equation is suitable for height loss correction in scoliosis patients when the Cobb angle is no more than 60°.
Significance: This study provides more information for the application of Bjurei's equation.
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