Calcaneus secundarius. Variation of a common accessory ossicle.
The calcaneus secundarius is an accessory ossicle of the anterior calcaneal facet. Dry bone examination of 1,367 calcanei revealed this trait 47 times (3.4%). Familiarity with the calcaneus secondarius may prove to be of clinical and radiographic value in distinguishing pathologic from normal variants in the calcaneus.
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D000293:Adolescent; D000328:Adult; D002111:Calcaneus / Q000033:anatomy & histology*; D005260:Female; D014644:Genetic Variation; D006801:Humans; D008297:Male