Table 1.
Demographic distribution among the cohort
| Cohort time | Trident® cups | Non-Trident® cups | p | Relative risk | ||
|---|---|---|---|---|---|---|
| January 2002 to March 2009 | April 2006 to December 2009 | |||||
| Total | ||||||
| Patients | 1291 | Squeaking | Nonsqueaking | 216 | 0.0001 | 0/0.07 |
| 92* | 1199 | |||||
| Bilateral | 206 | 7† | 199 | 32 | 0.3732 | 0/0.03 |
| Hips | 1497 | 99 | 1398 | 248 | 0.0001 | 0/0.07 |
| Male | 785 (60.8%) | 50 (52.2%) | 735 (61.1%) | 125 (57.9%) | 0.4524 | |
| Female | 506 (39.2%) | 42 (43.2%) | 464 (38.9%) | 91 (42.1%) | ||
| Age | 49.8 (15.3–79.7) | 46.1 (18.9–66.9) | 50.0 (15.3–79.7) | 49.5 (17.9–78.6) | 0.6192 | |
| Height | 1.73 (1.24–2.49) | 1.72 (1.52–1.98) | 1.73 (1.24–2.49) | 1.72 (1.42–2.03) | 0.1732 | |
| Weight | 85.8 (37.2–214.6) | 82.9 (43.1–139.7) | 86.0 (37.2–214.6) | 87.9 (38.6–159.7) | 0.1742 | |
| BMI | 28.4 (13.2–57.6) | 27.7 (16.3–49.7) | 28.5 (13.2–57.6) | 29.4 (16.6–50.4) | 0.0167 | |
* Twelve of 92 patients had bilateral total hips; †seven of 12 patients with bilateral total hips, both hips were squeaking; BMI = body mass index.