Journal of Experimental Orthopaedics

Table 2 Comparisons of the difference in the clinical factors between two groups classified by the ipsilateral femoral head and neck fractures

From: Specific types of femoral head fractures: be alert for pre-, intra-, and post-operative ipsilateral femoral neck fractures following fracture-dislocation of the femoral head

Variable	Before PSM			After PSM
Variable	iFHNF	non-iFHNF	p-value	iFHNF	non-iFHNF	p-value
Number	15 (100)	203 (100)		15 (100)	15 (100)
Side of injury			0.7329*			1.0000^†
Left	8 (53.3)	99 (48.8)		8 (53.3)	7 (46.7)
Right	7 (46.7)	104 (51.2)		7 (46.7)	8 (53.3)
Age	41.6 ± 20.81	38.0 (26.0–50.0)	0.9341^#	41.6 ± 20.81	38.13 ± 11.73	0.7242^#
Sex			1.0000^†			1.0000^†
Male	12 (80.0)	165 (81.3)		12 (80.0)	13 (86.7)
Female	3 (20.0)	38 (18.7)		3 (20.0)	2 (13.3)
Acetabulum fracture	5 (16.7)	137 (67.5)	0.0074^*	5 (16.7)	9 (60.0)	0.2723^†
Anterior dislocation	0 (0)	5(2.5)	1.0000^†	0 (0)	0 (0)	-
Central dislocation	0 (0)	10(4.9)	1.0000^†	0 (0)	2 (13.3)	0.48284^†
Posterior dislocation	15 (100)	111 (54.7)	0.0006^*	15 (100)	4 (26.7)	< 0.0001^†

PSM Propensity Score Matching, iFHNF The ipsilateral femoral head and neck fractures
^*Number of patients (percentage) and p-values determined with the chi-square test
^#Median (interquartile range) and p-values derived with the Mann–Whitney U test
^†Number of patients (percentage) and p-values determined with the Fisher exact test

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