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Relative fatigue life of the locking screws
| Manufacturer | Diameter (mm) | Mean Life | St. Dev |
| Ace | 4.5 | 10115 | 4426 |
| Biomet | 4.0 | 1502 | 615 |
| 5.0 | 360881 | 469213 | |
| Synthes | 3.9 | 1413 | 490 |
| 4.9 | 16121 | 3426 | |
| Howmedica – Alta | 3.7 | 888 | 608 |
| 5.0 | 1000000 | -1 | |
| Russell-Taylor | 4.5 | 18238 | 4009 |
| 5.0 | 46736 | 13702 | |
| S&N – Trigen | 5.0 | 436248 | 487507 |
1 None of the Howmedica screws failed and so the St Dev is undefined
