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Table 2 Lung, chest wall and diaphragmatic parameters, spinal curvatures in 16 subjects before and six months after corrective posterior spinal fusion. Figures are expressed as median (interquartile range)

From: Dynamic magnetic resonance imaging in assessing lung function in adolescent idiopathic scoliosis: a pilot study of comparison before and after posterior spinal fusion

  Before surgery After surgery P value
(* significant at 0.05 level)
Inspiratory volume (cc)    
Right lung 1719 (1232, 1858) 1764 (1362, 1938) 0.57
Left lung 1392 (1113, 1607) 1381 (1152, 1642) 0.35
Total 3127(2364, 3464) 3152 (2491, 3529) 0.50
Expiratory volume (cc)    
Right lung 662 (579, 817) 716 (586, 814) 0.61
Left lung 598 (501, 700) 601 (464, 707) 0.96
Total 1269 (1083, 1498) 1361 (1038, 1477) 0.64
Change in lung volume (cc)    
Right lung 996 (645, 1126) 969 (698, 1167) 0.68
Left lung 762 (535, 962) 736 (630, 1018) 0.22
Total 1770 (1206, 2089) 1730 (1362, 2203) 0.30
Right lung AP diameter at carina (mm)    
Inspiratory 117 (100, 123) 118 (107, 130) 0.07
Expiratory 84 (75, 92) 88 (82, 96) 0.06
Change 29 (21, 42) 29 (21, 42) 0.98
Left lung AP diameter at carina (mm)    
Inspiratory 122 (106, 133) 119 (108, 129) 0.18
Expiratory 89 (80,99) 93 (87, 101) 0.41
Change 29 (16, 46) 27 (18,33) 0.14
Right lung AP diameter at apex (mm)    
Inspiratory 135 (123, 151) 137 (116, 155) 0.50
Expiratory 1114 (99, 126) 114 (100, 133) 0.88
Change 21 (15,31) 20 (13, 25) 0.20
Left lung AP diameter at apex (mm)    
Inspiratory 126 (118, 145) 126 (121, 138) 0.92
Expiratory 104 (94, 114) 104 (97, 111) 0.72
Change 28 (17, 37) 23 (12, 33) 0.30
Right lung TS diameter at carina (mm)    
Inspiratory 97 (80, 116) 111 (106, 116) 0.013*
Expiratory 85 (75, 93) 87 (75, 96) 0.30
Change 15 (3, 27) 28 (17, 33) 0.006*
Left lung TS diameter at carina (mm)    
Inspiratory 92 (79, 103) 104 (99, 110) 0.002*
Expiratory 79 (59, 84) 86 (76, 93) 0.044*
Change 14 (11, 23) 20 (13, 28) 0.056
Right lung TS diameter at apex (mm)    
Inspiratory 106 (85, 126) 114 (105, 120) 0.039*
Expiratory 87 (71, 92) 91 (84, 100) 0.034*
Change 16 (10, 31) 24 (13, 32) 0.796
Left lung TS diameter at apex (mm)    
Inspiratory 112 (93, 117) 113 (104, 122) 0.088
Expiratory 98 (68, 113) 100 (83, 112) 0.163
Change 9 (6, 13) 12 (7, 17) 0.301
Right Diaphragmatic height (mm)    
Inspiratory 185 (172, 202) 201 (182, 223) <0.01*
Expiratory 136 (129, 150) 146 (135, 156) 0.196
Change 49 (25, 65) 53 (44, 66) 0.039*
Left Diaphragmatic height (mm)    
Inspiratory 185 (172, 206) 198 (186, 215) 0.01*
Expiratory 142 (129, 159) 148 (136, 161) 0.234
Change 44 (33, 57) 53 (44, 66) 0.039*
Breathing effort 4 (1,4) 1.75 (1, 3) 0.012*
Coronal Cobb angle (MR) 59 (53, 64) 24 (21, 28) <0.01*
Axial angle (MR) 9.9 (4.7, 13.0) 9.6 (4.0, 14.7) 0.215
Sagittal angle (MR) 19.1 (13.1, 28.8) 23.1 (17.2, 31.2) 0.056