Table 3.

Postoperative complications and clinical outcomes according to whether osteoporosis medication was BP or TP

	BP	TP	p-value
Cases, n	104	55	–
Mechanical complications	76 (73.1%)	32 (58.2%)	0.045
Subsequent vertebral fracture	47 (45.2%)	18 (32.7%)	0.18
Screw complications	42 (40.4%)	19 (34.5%)	0.29
Screw loosening	29 (27.9%)	18 (32.7%)	0.59
Screw backout	13 (12.5%)	1 (1.8%)	0.024
Rod fracture	0	0	–
Pseudoarthrosis	9 (8.7%)	1 (1.8%)	0.091
Revision due to mechanical complications	10 (9.6%)	9 (16.4%)	0.30
Postoperative JOA	9.7 ± 3.4	9.3 ± 3.3	0.45
Recovery rate of JOA	49.0 ± 27.5	52.1 ± 25.2	0.49
Final VAS (back pain)	29.8 ± 22.5	31.3 ± 24.5	0.71
Change in VAS (back pain)	40.4 ± 30.0	41.6 ± 32.3	0.83
Final VAS (leg pain or numbness)	18.4 ± 20.4	21.2 ± 25.3	0.46
Change in VAS (leg pain or numbness)	33.5 ± 27.1	35.8 ± 30.1	0.63

BP bisphosphonate, TP teriparatide, JOA Japanese Orthopaedic Association, VAS visual analogue scale