부산대학교 도서관

Results: Thirteen patients experienced RF. The RF levels were L3/4 in one patient, L4/5 in nine patients, and L5/S1 in three patients. Of the nine patients with RF at L4/5, two patients experienced RF after bone fusion. Of the 13 patients who experienced RF, seven patients experienced anterior longitudinal ligament (ALL) rupture. There were no significant differences in age, gender, rod material, rod diameter, and number of rods between the two groups. Patients in the RF group had significantly larger pre- and post-operative PI, pre- and post-LLIF, post-operative PI-LL, pre- and post-LLIF 2/3 PI-LLL, LLL change with PPS (PPSΔLLL), and postoperative PT. Patients in the RF group had significantly smaller preoperative LLL and preoperative TK. Multivariate analysis included seven independent variables with P<0.01, namely pre- and postoperative PI, postoperative PI-LL, pre- and post-LLIF 2/3 PI-LLL, PPSΔLLL, and ALL rupture. PPSΔLLL and ALL rapture were detected as risk factors for RF, and the cut off value for PPSΔLLL was 8 degrees in the ROC analysis.