TABLE I.
Stiffness and Strength of Locked Plating and Far Cortical Locking Constructs
| Locked Plating* | Far Cortical Locking*† | P Value‡ | |
|---|---|---|---|
| Stiffness (strong bone) | |||
| Axial stiffness (kN/mm) | 2.9 ± 0.13 | 0.36 ± 0.05/2.26 ± 0.08 | <0.001/<0.001 |
| Torsional rigidity (Nm2/deg) | 0.40 ± 0.03 | 0.17 ± 0.04/0.32 ± 0.01 | <0.001/<0.001 |
| Bending rigidity (Nm2) | 82.9 ± 1.96 | 59.0 ± 1.3/68.1 ± 3.3 | <0.001/<0.001 |
| Strength (strong bone) | |||
| Axial (kN) | 5.9 ± 0.2 | 5.5 ± 0.2 | 0.005 |
| Torsion (Nm) | 19.8 ± 1.1 | 30.4 ± 1.5 | <0.001 |
| Bending (Nm) | 75.0 ± 3.1 | 90.8 ± 5.0 | <0.001 |
| Strength (osteoporotic bone) | |||
| Axial (kN) | 4.4 ± 0.1 | 3.7 ± 0.2 | <0.001 |
| Torsion (Nm) | 19.6 ± 1.0 | 21.3 ± 1.1 | 0.036 |
| Bending (Nm) | 30.4 ± 3.4 | 36.5 ± 3.2 | 0.02 |
*
N = 5 for each testing group. The values are given as the mean and the standard deviation.
†
The stiffness data are given as the initial value followed by the secondary value.
‡
The first p value pertains to the comparison between the initial far cortical locking value and the locked plating value, and the second p value pertains to the comparison between the secondary far cortical locking value and the locked plating value.