Bone mineral density after implantation of a femoral neck hip prosthesis – a prospective 5 year follow-up

Table 1 Bone density and changes between measurements

ROI	10 days		3 mo		10d – 3 mo		12 mo		10d – 12 mo		60 mo		10d – 60 mo
	mean bone densitiy in	SD	mean bone density in	SD	mean change in %	p	mean bone density in	SD	mean change in %	p	mean bone density in	SD	mean change in %	p
	g/cm2		g/cm2				g/cm2				g/cm2	SD	mean change in %	p
1	0.76	0.14	0.73	0.13	−3.35	s	0.75	0.13	−0.76	s	0.74	0.18	−2.51	ns
2	0.81	0.14	0.79	0.14	−2.99	s	0.82	0.14	1.60	s	0.79	0.19	−1.26	ns
3	1.06	0.19.	1.05	0.19	−1.09	s	1.08	0.19	2.84	s	1.05	0.21	−0.009	ns
4	1.60	0.23	1.57	0.22	−2.28	s	1.60	0.23	−0.35	ns	1.57	0.24	−1.32	ns
5	1.52	0.19	1.49	0.19	−3.01	s	1.51	0.19	−0.77	ns	1.43	0.18	−5.43	s
6	1.51	0.20	1.47	0.20	−3.71	s	1.50	0.19	−0.69	s	1.58	0.24	5.13	ns
7	1.08	0.12	1.06	0.12	−2.77	s	1.08	0.12	0.67	ns	1.13	0.19	4.67	ns
1-3 lat	0.82	0.14	0.80	0.14	−2.36	s	0.83	0.14	1.37	s	0.86	0.18	5.00	ns
5-7 med	1.37	0.15	1.10	0.13	−3.18	s	1.13	0.13	−0.40	ns	1.38	0.16	0.73	ns
1-7 all	1.05	0.14	1.02	0.13	−2.74	s	1.05	0.13	0.19	ns	1.18	0.16	1.12	ns

Mean values of bone mineral density and mean values of changes in percent between the 10-day- and 3-month-examinations, as well as between the 10-day- and 12-month-examinations and between the 10-day-and 60-month examinations. ROI Regions of Interest 1–7 and combined zones laterally (1–3 lat), medially (5–7 med) and overall (1–7 all). SD standard deviation, s significant, ns not significant (Wilcoxon signed-ranks test, t = 0.05)

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