Ossicle | Prevalence | Clinical significance | Differential diagnosis | |
---|---|---|---|---|
Os trigonum | 1–25% | Os trigonum syndrome | Posterior ankle impingement, Cedell’s fracture, Shepherd’s fracture | |
Os sustentaculi | 0.3–0.4% | Coexisting talo-calcaneal coalition | Fractures of the sustentaculum tali | |
Os calcaneus secundarius | 0.6–7% | – | Fracture of the anterosuperior calcaneal process | |
Os subtibiale | 0.9% | – | Avulsion fractures | |
Os subfibulare | 2.1% | – | Avulsion fractures | |
Rare | Os supratalare | – | – | Avulsion fractures |
Os talotibiale |