Table 2.

Surgical data. Hb: hemoglobin; ICU: intensive care unit; Los: length of stay. OPF: open posterior fusion; PO: percutaneous osteosynthesis.

Surgical Parameters	Group OPF	Group PO	p Value
n° of patients	58	40
Operative time	192 (±49) min	101 (±27) min	0.035
Estimated intraoperative blood loss	521.5 (±186) mL	103.4 (±54) mL	0.029
Preoperative Hb value	11.1 (±2.1) g/dL	11.4 (±1.8) g/dL	0.398
Postoperative Hb value	7.9 (±1.7) g/dL	10.9 (±1.2) g/dL	0.038
Patients requiring blood transfusion	24 (41.3%)	5 (12.5%)	0.031
Patients requiring ICU	17 (29.2%)	3 (7.5%)	0.021
Los (days)	9.7 (±2.4)	5.0 (±1.2)	0.037
Instrumented Level
3	16 (27.5%)	8 (20%%)	0.897
5	34 (41.3%)	25 (62.5%)	0.832
7	8 (13.8%)	7 (17.5%)	0.617