Variable | Obese (n = 54) | Non-obese (n = 60) | P-value |
---|---|---|---|
BMI (kg/m2), mean ± SD (range) | 36.2 ± 5.4 (30.0 – 51.7) | 25.8 ± 3.0 (16.0 – 29.8) | < 0.001* |
Male, n (%) | 25 (46.3) | 20 (33.3) | 0.159 |
Age (y), mean ± SD (range) | 61.4 ± 12.0 (20 – 77) | 62.1 ± 13.3 (25 – 80) | 0.768 |
ASA Class, mean ± SD (range) | 2.78 ± 0.54 (2 – 4) | 2.57 ± 0.65 (1 – 4) | 0.060 |
PMI (mm2/m2), mean ± SD (range) | 545.3 ± 174.4 (190.0 – 941.7) | 449.6 ± 179.8 (152.2 – 940.4) | 0.004* |
Comorbidities/Pre-existing conditions, n (%) | |||
DM | 11 (20.4) | 10 (16.7) | 0.611 |
Smokers | 7 (13.0) | 7 (11.7) | 0.834 |
Cardiac (CHF, CAD, Atrial fibrillation) | 11 (20.4) | 14 (23.3) | 0.704 |
CKD | 7 (13.0) | 9 (15.0) | 0.757 |
COPD | 19 (35.2) | 15 (25.0) | 0.234 |
CVA | 1 (1.9) | 1 (1.7) | 0.936 |
PVD | 2 (3.7) | 1 (1.7) | 0.497 |
Cancer | 4 (7.4) | 2 (3.3) | 0.332 |
No pre-operative motor deficits, n (%) | 41 (75.9) | 39 (65.0) | 0.204 |
No pre-operative sensory deficits, n (%) | 35 (64.8) | 30 (50.0) | 0.110 |
Ambulatory status, n (%) | |||
Ambulate without assistive device | 16 (29.6) | 20 (33.3) | 0.674 |
Ambulate with assistive device | 30 (55.6) | 23 (38.3) | 0.066 |
Wheelchair bound | 8 (14.8) | 7 (11.7) | 0.617 |
Not recorded | 4 (7.4) | 6 (10.0) | 0.624 |
Indication for reoperation | |||
Spinal stenosis | 22 (40.7) | 29 (48.3) | 0.418 |
Disc disease | 13 (24.1) | 16 (26.7) | 0.749 |
Spondylolisthesis | 14 (25.9) | 14 (23.3) | 0.749 |
Trauma | 3 (5.6) | 2 (3.3) | 0.562 |
Deformity | 25 (46.3) | 27 (45.0) | 0.889 |
Adjacent segment disease | 22 (40.7) | 24 (40.0) | 0.936 |
Pseudarthrosis | 27 (50.0) | 30 (50.0) | 1.000 |
HNP | 3 (5.6) | 3 (5.0) | 0.897 |
Infection | 2 (3.7) | 1 (1.7) | 0.497 |
SSII of primary surgery, mean ± SD (range) | 11.9 ± 6.3 (3 – 32) | 13.9 ± 5.9 (3 – 32) | 0.067 |
SSII of revision surgery, mean ± SD (range) | 25.6 ± 13.7 (11 – 48) | 25.8 ± 11.3 (11 – 48) | 0.943 |