Table 1.
Mechanical properties of WT and HET SSTs and ATs. Elastin haploinsufficiency increased the linear stiffness of both tendons, and numerous differences between SSTs and ATs were detected.
|
SST |
AT |
|||
|---|---|---|---|---|
| Parameter | WT (n = 13) | HET (n = 10) | WT (n = 8) | HET (n = 11) |
| Peak stress (MPa)# | 5.96 ± 3.23 | 6.69 ± 2.33 | 10.55 ± 2.97 | 12.31 ± 2.08 |
| Equilibrium stress (MPa)# | 3.92 ± 2.09 | 4.54 ± 1.74 | 7.20 ± 2.19 | 8.46 ± 1.62 |
| Percent relaxation (%) | 33.72 ± 6.85 | 32.72 ± 6.39 | 32.22 ± 3.35 | 31.43 ± 3.25 |
| Relaxation time (s)# | 2.38 ± 0.65 | 2.30 ± 0.73 | 3.40 ± 0.64 | 3.43 ± 0.72 |
| Toe stiffness (N/mm) | 2.75 ± 1.31 | 3.23 ± 1.31 | 3.13 ± 0.69 | 3.64 ± 1.28 |
| Linear stiffness (N/mm)* # | 8.50 ± 2.95 | 9.72 ± 2.98 | 18.86 ± 3.37 | 21.42 ± 2.62 |
| Transition displacement (mm)# | 0.092 ± 0.027 | 0.082 ± 0.020 | 0.168 ± 0.035 | 0.155 ± 0.014 |
| Transition force (N)# | 0.331 ± 0.168 | 0.323 ± 0.089 | 0.560 ± 0.120 | 0.577 ± 0.187 |
| Toe modulus (MPa)# | 27.15 ± 8.25 | 33.02 ± 30.63a | 78.86 ± 59.54 | 48.36 ± 30.36a |
| Linear modulus (MPa)# | 101.2 ± 50.8 | 129.4 ± 96.3 | 443.8 ± 131.7 | 485.3 ± 141.6 |
| Transition strain (%)# | 4.75 ± 3.00 | 4.19 ± 2.62a | 1.54 ± 1.17 | 2.30 ± 1.57a |
| Transition stress (MPa) | 1.68 ± 0.83 | 1.99 ± 1.83a | 1.21 ± 0.83 | 1.07 ± 0.81a |
a
n = 9. Two-way ANOVA.
*
genotype effect p < 0.05.
#
tendon type effect p < 0.05. All interaction effects p > 0.05.