Maintenance of bone mineral density after implantation of a femoral neck hip prosthesis

Table 2 Bone density and changes between measurements at 10 days, 3 months and 12 months postop

ROI	10 days		3 months		10 d-3 mo		12 months		10 d- 12 mo
	mean bone density in g/cm2	SD	mean bone density in g/cm2	SD	mean change in %		mean bone density in g/cm2	SD	mean change in %
1	0.76	0.14	0.73	0.13	-3.35	s	0.75	0.13	-0.76	s
2	0.81	0.14	0.79	0.14	-2.99	s	0.82	0.14	1.60	s
3	1.06	0.19	1.05	0.19	-1.09	s	1.08	0.19	2.84	s
4	1.60	0.23	1.57	0.22	-2.28	s	1.60	0.23	-0.35	ns
5	1.52	0.19	1.49	0.19	-3.01	s	1.51	0.19	-0.77	ns
6	1.51	0.20	1.47	0.20	-3.71	s	1.50	0.19	-0.69	s
7	1.08	0.12	1.06	0.12	-2.77	s	1.08	0.12	0.67	ns
1–3 lat	0.82	0.14	0.80	0.14	-2.36	s	0.83	0.14	1.37	s
5–7 med	1.14	0.14	1.10	0.13	-3.18	s	1.13	0.13	-0.40	ns
1–7 all	1.05	0.14	1.02	0.13	-2.74	s	1.05	0.13	0.19	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
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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