A practical method for the retrieval of tulip-head polyaxial pedicle screw by reusing the rod in revision and implants removal surgery: introduction of technique and evaluation of clinical outcomes

Table 2 Comparison of operative and postoperative data between subgroups

	Ar group	As group	Br group	Bs group	P¹	P²
Operation duration (min)	149.67 ± 35.08	57.71 ± 10.14	224.72 ± 41.39	109.07 ± 12.00	p < 0.001	p < 0.001
Intraoperative blood loss (ml)	570 ± 170.07	125.67 ± 47.12	762.22 ± 131.80	257.97 ± 98.89	p < 0.001	p < 0.001
Hospital stay (day)	13.11 ± 3.06	7.67 ± 2.46	12.17 ± 2.87	7.50 ± 2.13	p > 0.05	p > 0.05
Hospitalization costs (CNY)	72,532.56 ± 11,161.40	8862.76 ± 1904.68	69,093.61 ± 15,604.07	8845.63 ± 1830.41	p > 0.05	p > 0.05

As s subgroup of group A, Ar r subgroup of group A, Bs s subgroup of group B, Br r subgroup of group B, P¹ comparison between As and Bs, P² comparison between Ar and Br

ISSN: 1471-2482