Table 1.
Number of studies for each bearing couple stratified by level of evidence
| Type of bearing | Level of evidence | |||
|---|---|---|---|---|
| I | II | III | IV | |
| Stemmed metal-on-metal | 3 | 1 | 1 | 16 |
| Metal-on-metal resurfacing | 2 | 1 | 4 | 15 |
| Ceramic-on-ceramic | 4 | 1 | 1 | 15 |
| Ceramic-on-metal | 0 | 0 | 0 | 0 |
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