Table 2.

Comparison of hospitalization and operation between the four groups

	FNS	FNS + CS	TCS	QCS	P value
Operating time (min)	57.33 ± 9.66ac	61.43 ± 7.95a	49.31 ± 9.44b	54.76 ± 8.29c	< 0.001
Intraoperative blood loss (ml)	56.05 ± 18.66ab	62.86 ± 17.29a	46.47 ± 22.88c	48.10 ± 18.61bc	0.020
Fracture healing(month)	3.88 ± 0.79a	3.36 ± 0.93b	4.71 ± 0.94c	4.38 ± 0.59c	< 0.001

Notes: The same letter in the figure indicates no significant difference, while different letters indicate significant difference. Abbreviations: FNS femoral neck system, FNS + CS femoral neck system combined with a cannulated screw, TCS triple cannulated screws, QCS quadruple cannulated screws