Effects of body mass index and range of motion on intraoperative change in pelvic tilt during total hip arthroplasty using the direct anterior approach

Table 4 Univariate analysis between increasing group and non-increasing group in change of axial rotation

	Increasing group	Non-increasing group	P value
	(11 hips)	(189 hips)	P value
Sex (female/male)	9/2	155/34	1.000^a
Age (years)	68.0 ± 10.4	67.9 ± 9.7	0.942^b
BMI (kg/m²)	23.0 ± 4.6	24.7 ± 3.8	0.139^b
K-L grade (1/2/3/4)	11/0/0/0	182/6/1/0	0.788^a
Crowe’s classification (I/II/III/IV)	0/0/3/8	0/4/42/143	1.000^a
Pelvic tilt at the start of surgery (°)	−5.5 ± 11.7	−7.5 ± 6.0	0.021^b
ROM (°)
Flexion	105.9 ± 22.3	109.5 ± 16.6	0.806^b
Abduction	34.1 ± 13.9	32.1 ± 11.8	0.289^b
Adduction	19.1 ± 11.1	17.4 ± 6.1	0.654^b
External rotation	39.5 ± 13.1	42.0 ± 10.9	0.579^b
Internal rotation	27.3 ± 21.4	27.6 ± 13.5	0.771^b

BMI body mass index, K-L grade Kellgren-Lawrence grade, ROM range of motion
^a Fisher’s exact test. ^b Mann-Whitney U test.,

ISSN: 1471-2474