Model-based roentgen stereophotogrammetric analysis using elementary geometrical shape models: 10 years results of an uncemented acetabular cup component

Table 2 Non-cemented titanium acetabular cup component migration – mean and standard deviation values at 6, 12 weeks, 6, 12, 24, 60 and 120 months follow-up using model-based EGS are presented. According to axis-symmetric implant design of the cup component, Ry migration values are not given

Follow-up	Translation [mm]			Rotation [deg]			Cases [n]
Follow-up	x	y	z	Rx	Ry	Rz
Reference
mean	0.00	0.00	0.00	0.00	–	0.00	39
SD	0.00	0.00	0.00	0.00	–	0.00
6 weeks
mean	0.20	0.11	−0.04	−0.17	–	−0.10	32
SD	0.41	0.22	0.33	0.96	–	0.72
12 weeks
mean	0.16	0.14	−0.06	−0.12	–	−0.08	33
SD	0.44	0.23	0.39	0.86	–	0.80
6 months
mean	0.22	^* 0.16	0.03	−0.27	–	0.05	37
SD	0.45	0.25	0.42	0.95	–	0.76
12 months
mean	0.23	^* 0.16	0.07	−0.30	–	−0.19	39
SD	0.44	0.22	0.38	0.91	–	0.67
24 months
mean	0.28	^* 0.17	0.02	^* -0.61	–	0.00	36
SD	0.46	0.24	0.50	0.57	–	1.03
60 months
mean	0.29	0.19	−0.02	−0.21	–	− 0.07	15
SD	0.52	0.27	0.43	1.24	–	0.47
120 months
mean	0.19	^* 0.36	−0.04	− 0.53	–	0.22	18
SD	0.69	0.27	0.35	0.67	–	1.21

ISSN: 1471-2474