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 3 Univariate analysis between increasing group and non-increasing group in change of pelvic tilt

	Increasing group	Non-increasing group	P value
	(51 hips)	(149 hips)	P value
Sex (female/male)	48/3	116/33	0.010^a
Age (years)	68.8 ± 8.7	67.6 ± 10.0	0.687^b
BMI (kg/m²)	23.3 ± 4.1	25.1 ± 3.7	0.001^b
K-L grade (1/2/3/4)	0/1/14/36	0/3/31/115	0.248^a
Crowe’s classification (I/II/III/IV)	0/48/2/1	0/145/4/0	0.193^a
Pelvic tilt at the start of surgery (°)	−6.5 ± 5.9	−7.8 ± 6.6	0.167^b
ROM (°)
Flexion	111.9 ± 14.8	108.4 ± 17.5	0.315^b
Abduction	35.7 ± 15.7	31.0 ± 10.1	0.044^b
Adduction	18.5 ± 6.7	17.1 ± 6.3	0.188^b
External rotation	43.5 ± 10.2	41.3 ± 11.3	0.399^b
Internal rotation	33.2 ± 13.8	25.6 ± 13.5	0.001^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