Table 1.
Mechanical Testing of SS and IS tendons at 6 Weeks after last surgerya
| Sham | TT | Immediate repair | 2w delayed repair | 6w delayed repair | |
|---|---|---|---|---|---|
| Supraspinatus tendon | |||||
| Max load (N) | 2.486±0.336 | 0.394±0.199b | 1.621±0.535bc | 1.334±0.467bc | 1.169±0.310bc |
| Displacement at Max load (mm) | 0.746±0.306 | 0.642±0.443 | 0.699±0.204 | 0.570±0.152 | 0.645±0.421 |
| Stiffness (N/mm) | 3.626±1.608 | 0.920±0.832b | 2.184±0.721c | 2.392±1.046c | 2.348±0.982c |
| Strength (MPa) | 1.753±0.651 | 0.278±0.157b | 1.828±1.488c | 0.938±0.480c | 0.751±0.340bc |
| Ratio of the rupture at the tendon-muscle junction | 5/5 | 0/5 | 5/5 | 5/5 | 4/5 |
| Infraspinatus tendon | |||||
| Max load (N) | 1.343±0.304 | 0.319±0.184b | 0.993±0.309c | 0.968±0.139bc | 0.776±0.132bc |
| Displacement at Max load (mm) | 0.963±0.462 | 1.518±0.991 | 1.193±1.072 | 0.696±0.141 | 0.901±0.355 |
| Stiffness (N/mm) | 2.378±0.764 | 0.634±0.598b | 1.765±0.647c | 1.322±0.194bc | 1.462±0.516c |
| Strength (MPa) | 0.806±0.501 | 0.161±0.085b | 0.715±0.115c | 0.611±0.096c | 0.517±0.174c |
| Ratio of the rupture at the tendon-muscle junction | 5/5 | 0/5 | 5/5 | 4/5 | 4/5 |
a
The values are given as the mean and the standard deviation.
b
Comparing to the sham group, the difference was significant (P < .05).
c
Comparing to the TT group, the difference was significant (P < .05).