Subpedicle Decompression and Vertebral Reconstruction for Thoracolumbar Magerl Incomplete Burst Fractures via a Minimally Invasive Method

Study design Retrospective. Objective To evaluate the clinical and radiographical results. Summary of background data The evolution of posterior approach for burst fractures was from long-segment to short-segment and then to monosegmental fixation. Decompression of the spinal cord is performed by anterior or posterior approaches. The technique attempts to decompress the spinal cord by a paramedian subpedicle approach, and simultaneous vertebral reconstruction with pile-up titanium spacers (subpedicle decompression and body augmentation [SpBA]) was developed. Methods Eighty patients with symptomatic single thoracolumbar Magerl incomplete burst fractures were included. After manual reduction, transpedicle body augmentation and shortsegment fixation (TpBA group) were performed in 38 patients and SpBA in 42 cases. The mean follow-up was 52.6 ± 18.7 (TpBA) and 42.1 ± 7.8 (SpBA) months, and the age was 57.9 ± 7.2 and 59.1 ± 8.3 years. Clinical and radiographical outcomes were analyzed. Results The operation time was 66 ± 11 (TpBA) versus 34.5 ± 5.5 (SpBA) minutes. The initial anterior vertebral correction was 46.8 ± 12.2% (TpBA) versus 53.2 ± 15.0% (SpBA) (P = 0.03) and the final correction was 44.0 ± 10.8% versus 51.5 ± 15.3% (P = 0.01). Initial corrections of the lateral Cobb angle were 22.3° ± 2.6° versus 22.8° ± 2.7° and the final corrections were 19.1° ± 3.4° versus 20.5° ± 2.9°. The VAS score was 7.7 ± 1.2 versus 7.9 ± 1.2 preoperatively and 2.2 ± 0.7 versus 1.8 ± 0.6 (P = 0.02) at the final visit. Seventy-five patients maintained or recovered to Frankel grade E. Three patients in the TpBA group and 2 in the SpBA group improved from grade C to D. Technical complications included 1 root overstretch in the SpBA group and one incomplete decompression in the TpBA group. Conclusion SpBA is a safe and fast technique to treat Magerl incomplete burst fractures and leads to good clinical results. Level of evidence N/A.