Table 5 Classification system by Conti et al.
From: Comparison of preoperative MRI and intraoperative findings of posterior tibial tendon insufficiency
Type | Description |
|---|---|
I | |
IA | One or two fine longitudinal splits in the posterior tibial tendon without evidence of intrasubstance degeneration. The splits are frequently found on the undersurface of the tendon |
IB | Increased number of longitudinal splits with an increase in tendon width with mild surrounding fibrosis. There is no significant tendon degeneration |
II | The posterior tibial tendon is narrowed, with long longitudinal splits and intramural degeneration. Often, the tendon has a bulbous appearance distal to the attenuated portion |
III | |
IIIA | This is notable for more diffuse swelling of the posterior tibial tendon, with uniform degeneration becoming a prominent feature. There are a few strands of intact tendon through the area of degeneration |
IIIB | There is a complete rupture of the posterior tibial tendon, with complete replacement of the tendon by scar tissue |