Table 1.
Summary of analyzed studies
| Study | Control materials | Head diameter (mm) | Fixation | Design | Number of zirconia | Number of control | Manufacturer of zirconia |
|---|---|---|---|---|---|---|---|
| Allain et al. [1] (1999) | Alumina | 28, 32 | Cement | HC | 78 | 117 | Ceraver |
| Hernigou and Bahrami [11] (2003) | Alumina, stainless steel | 28, 32 | Cement | Cohort | 40 | 96 | Ceraver |
| Inoue et al. [14] (2006) | Co-Cr | 22 | Cement | Cohort | 13 | 13 | Nippon Tokushu Tougyou |
| Liang et al. [21] (2007) | Alumina | 22 | Cement | HC | 58 | 46 | JMM |
| Kim [15] (2005) | Co-Cr | 28 | Cement, cementless | RCT | 52 | 52 | DePuy |
| von Schewelov et al. [30] (2005) | Stainless steel | 22 | Cement | RCT | 28 | 28 | DePuy |
| Kim et al. [16] (2003) | Co-Cr | 22 | Cementless | * | 50 | 98 | DePuy |
* Survival data from 50 patients with bilateral THAs were treated as a RCT and the linear wear rate from 98 patients including bilateral and unilateral THAs was treated as a non-RCT; HC = studies with historical cohort; RCT = randomized controlled trial.