TABLE 2.
Knee extension maximal torque and patellar tendon properties.
| Tendinopathy | Controls | t-Value(16) | Difference BCa 95% CI | P-Value | d-Value | |
| Isometric torque (N⋅m) | 204 ± 14 | 226 ± 19 | −1.29 | −22 [−57, 10] | 0.216 | −0.31 |
| Tendon dimensions | ||||||
| Tendon length (mm) | 49.6 ± 1.7 | 46.7 ± 1.6 | 0.85 | 0.2 [−0.2, 0.6] | 0.410 | 0.21 |
| Tendon mean CSA (mm2) | 148 ± 7.8*** | 111 ± 5.5 | −4.50 | 37 [22, 52] | <0.001 | −1.09 |
| Ramp contraction | ||||||
| Peak force (N) | 5271 ± 287 | 5909 ± 534 | −1.39 | −638 [−1745, 302] | 0.185 | −0.34 |
| Stress (MPa) | 35.8 ± 1.4** | 53.9 ± 4.7 | −3.70 | −18.1 [−28.5, −10.1] | 0.002 | −0.90 |
| Strain (%) | 8.8 ± 0.4 | 8.6 ± 0.4 | 0.49 | 0.3 [−0.9, 1.3] | 0.634 | 0.12 |
| Stiffnessmax (N⋅mm–1) | 2029 ± 170** | 2617 ± 210 | −3.07 | −587 [−939, −234] | 0.007 | −0.74 |
| Stiffnesscom (N⋅mm–1) | 1745 ± 146 | 1887 ± 75 | −0.80 | −142 [−430, 210] | 0.435 | −0.19 |
| Young’s modulusmax (GPa) | 0.69 ± 0.05** | 1.10 ± 0.09 | −3.88 | −0.41 [−0.63, −0.23] | 0.001 | −0.94 |
| Young’s moduluscom (GPa) | 0.58 ± 0.04** | 0.85 ± 0.06 | −3.49 | −0.27 [−0.43, −0.12] | 0.003 | −0.85 |
| Triangular loading ramps (Figures 3A,B) | ||||||
| Hysteresis (%) | 18.6 ± 1.7 | 17.1 ± 1.0 | 0.76 | 1.4 [−1.9, 4.8] | 0.461 | 0.18 |
| Strain energy (J) | 7.0 ± 0.5 | 8.5 ± 1.2 | −1.48 | −1.5 [−3.7, 0.3] | 0.656 | 0.36 |
Values are expressed as mean ± standard error of the mean. Bias-corrected and accelerated (BCa) 95 percent bootstrap confidence interval. **p < 0.01, ***p < 0.001 compared with healthy control patellar tendons.