A Geometric Model to Determine Patient-Specific Cup Anteversion Based on Pelvic Motion in Total Hip Arthroplasty

Table 1

Data from the current study and previously studies publishing average and standard deviations of standing and sitting pelvic tilt and either reported or calculated change in pelvic tilt. Overall population-based averages were calculated from the weighted averages of these studies. NR = not recorded.

				Standing Pelvic Tilt (°)				Sitting Pelvic Tilt (°)				Change in Pelvic Tilt (°)
Study	Year	Number of Subjects	Percentage of Total Patients	Average	Minimum	Maximum	Standard Deviation	Average	Minimum	Maximum	Standard Deviation	Average	Standard Deviation
DiGioa et al. [24]	2006	84	22	-1.2	-27	22.5	8.2	35.9	9	58	12.6	37.1	NR
Phillipot et al. [25]	2009	67	18	4.41	NR	NR	6.68	25.5	NR	NR	9.6	21.1	NR
Lazennec et al. [17]	2011	50	13	2.4	-18	20	7.3	16.9	0	44	9.1	14.5	NR
Kanawade et al. [14]	2014	85	22	-0.4	-26	15	7.4	28.3	48	5	9.1	28.7	8.6
Ranawat et al. [26]	2016	68	18	-3.7	-25	9	8.8	17.7	-7	38	11.6	21.4	12.5
Current Study	2019	24	7	4.2	25.6	-8.3	7.7	23.4	41	5.1	10.6	19.3	9.9