Table 1.
Demographics of different groups according to cup type in patients with primary osteoarthritis
| Cup type | Number of hips | Mean age (years) (± SD) |
BMI (± SD) |
Sex ratio female/male (p < 0.001) |
Charnley Class A/B/C (p < 0.001) |
|---|---|---|---|---|---|
| Press-fit stainless steel | 402 | 72 ± 10 | 26 ± 5 | 1.40 | 261/110/31 |
| Press-fit cobalt-chromium | 191 | 75 ± 8 | 26 ± 4 | 1.85 | 142/30/19 |
| Press-fit porous-coated | 404 | 71 ± 7 | 27 ± 5 | 0.91 | 148/132/124 |
| Press-fit stainless steel with additional screw fixation | 590 | 72 ± 10 | 26 ± 4 | 1.68 | 370/142/78 |
| Press-fit porous-coated with additional screws | 136 | 74 ± 8 | 26 ± 5 | 2.07 | 60/61/15 |
| Tripod grit-blasted | 797 | 72 ± 8 | 26 ± 4 | 1.58 | 399/286/112 |
| Tripod porous- coated | 81 | 71 ± 10 | 26 ± 5 | 1.45 | 19/42/20 |