Table 3.
Mode of Failure and Screw Bending
| Screw Type, Screw Diameter, (Count) | Screw Head Cut Out | Shaft Fracture | Screw Head Loosening | Rotational Instability | Screw Bending (%) | |
|---|---|---|---|---|---|---|
| JFXS | 4.5 mm (6) | 1 | 2 a | 2 | 1 | 2 (33) |
| 6.0 mm (4) | 2 | 2 | 0 | 0 | 3 (75) | |
| HCS | 4.5 mm (6) | 3 | 1 | 2 | 0 | 5 (83) |
| 6.5 mm (4) | 3 | 0 | 1 | 0 | 0 (0) | |
The mode of failure during the ultimate load to failure testing listed by screw type and diameter is outlined. Additional screw failure due to bending of the screw is indicated.
HCS, headless compression screws; JFXS, Jones fracture‐specific screw.
a
One specimen failed preliminarily due to metatarsal shaft fracture, which occurred during the 1st and 10th loading cycle.