Table 1 Overview of calcaneal spur characteristics and regular calcaneal features that can be mistaken for true spurs.
| Â | Spur-free AT enthesis | Posterior spur | Spur free PF enthesis | Plantar spur |
|---|---|---|---|---|
Spur tip | – | Points towards preferred collagen orientation of AT | – | Points towards preferred collagen orientation of PF |
Presence of trabeculae in spurs | – | All spurs | – | All spurs |
Trabecular pattern | – | No preferred orientation | – | No preferred orientation |
Enthesial fibrocartilage | – | All spurs | – | All spurs |
Spur location | – | Intratendinous (in posterior part of AT insertion) | – | Intra- or subfascial |
Surface features that can be mistaken for spurs | Calcaneal spine, cortical irregularities (up to 2 mm)* | – | Medial/lateral calcaneal process, cortical irregularities (up to 2 mm)* |  |
