Short to Midterm Follow-Up of Periprosthetic Bone Mineral Density after Total Hip Arthroplasty with the Ribbed Anatomic Stem

Table 3

Subgroup analysis of the potential influential factors of bone mineral density.

	Prosthetic side BMD (g/cm^2)			Contralateral side BMD (g/cm^2)
Gruen zone	Non-AVN (n=25)	AVN (n=16)	P-value	Non-AVN (n=25)	AVN (n=16)	P-value
Gruen zone 1	0.646 ± 0.106	0.631 ± 0.132	0.681	0.614 ± 0.091	0.610 ± 0.084	0.886
Gruen zone 2	1.275 ± 0.238	1.208 ± 0.288	0.422	1.267 ± 0.165	1.300 ± 0.208	0.572
Gruen zone 3	1.653 ± 0.221	1.579 ± 0.279	0.350	1.652 ± 0.206	1.643 ± 0.220	0.895
Gruen zone 4	1.605 ± 0.220	1.509 ± 0.270	0.222	1.671 ± 0.184	1.655 ± 0.225	0.798
Gruen zone 5	1.618 ± 0.221	1.594 ± 0.211	0.729	1.679 ± 0.172	1.630 ± 0.260	0.470
Gruen zone 6	1.407 ± 0.238	1.323 ± 0.295	0.321	1.377 ± 0.167	1.338 ± 0.248	0.585
Gruen zone 7	0.915 ± 0.301	0.847 ± 0.334	0.504	0.984 ± 0.155	0.903 ± 0.152	0.104
Gruen zone	BMI ≤24 (n=19)	BMI>24 (n=22)	P-value	BMI ≤24 (n=19)	BMI>24 (n=22)	P-value
Gruen zone 1	0.631 ± 0.106	0.647 ± 0.125	0.680	0.603 ± 0.086	0.620 ± 0.089	0.530
Gruen zone 2	1.228 ± 0.291	1.267 ± 0.230	0.632	1.221 ± 0.171	1.331 ± 0.178	0.051
Gruen zone 3	1.552 ± 0.292	1.686 ± 0.179	0.081	1.613 ± 0.209	1.678 ± 0.209	0.327
Gruen zone 4	1.504 ± 0.263	1.623 ± 0.213	0.118	1.625 ± 0.191	1.699 ± 0.202	0.232
Gruen zone 5	1.531 ± 0.234	1.675 ± 0.176	0.031	1.605 ± 0.222	1.706 ± 0.189	0.123
Gruen zone 6	1.332 ± 0.266	1.411 ± 0.258	0.342	1.349 ± 0.205	1.373 ± 0.201	0.699
Gruen zone 7	0.920 ± 0.354	0.861 ± 0.275	0.554	0.943 ± 0.191	0.961 ± 0.125	0.717

BMD, bone mineral density; AVN: avascular necrosis; BMI, body mass index.