Table 2.
Periprosthetic changes in bone mineral density around hydroxyapatite- (HA-) and Bonemaster- (BM-) coated Taperloc stems measured by dual-energy X-ray absorbtiometry (DXA). Results are given in percentage (standard deviation) of postoperative values after 3 months, 6 months, 1 year, and 2 years
| Gruen zone | n | 3 months | n | 6 months | n | 1 year | n | 2 year | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Bonemaster | 30 | 92 (19) | 29 | 94 (25) | 31 | 90 (26) | 30 | 87 (19) |
| HA | 20 | 83 (14) | 22 | 79 (13) | 22 | 76 (15) | 22 | 79 (18) | |
| 2 | Bonemaster | 30 | 89 (10) | 29 | 92 (8) | 31 | 90 (10) | 30 | 87 (14) |
| HA | 20 | 90 (10) | 22 | 90 (8) | 22 | 89 (9) | 22 | 86 (10) | |
| 3 | Bonemaster | 30 | 93 (7) | 29 | 96 (6) | 31 | 94 (8) | 30 | 90 (12) |
| HA | 20 | 94 (5) | 22 | 96 (5) | 22 | 95 (7) | 22 | 92 (9) | |
| 4 | Bonemaster | 30 | 95 (5) | 29 | 95 (6) | 31 | 94 (5) | 30 | 90 (9) |
| HA | 20 | 96 (5) | 22 | 95 (4) | 22 | 94 (6) | 22 | 90 (7) | |
| 5 | Bonemaster | 30 | 94 (7) | 29 | 97 (7) | 31 | 96 (9) | 30 | 90 (11) |
| HA | 20 | 97 (5) | 22 | 97 (6) | 22 | 93 (10) | 22 | 88 (12) | |
| 6 | Bonemaster | 30 | 93 (9) | 29 | 94 (8) | 31 | 94 (9) | 30 | 89 (11) |
| HA | 20 | 94 (7) | 22 | 86 (23) | 22 | 90 (10) | 22 | 88 (9) | |
| 7 | Bonemaster | 30 | 82 (13) | 29 | 77 (14) | 31 | 73 (15) | 30 | 70 (16) |
| HA | 20 | 83 (9) | 22 | 77 (11) | 22 | 73 (12) | 22 | 69 (13) | |