"Duplicate calcaneus": a rare developmental defect observed in several skeletal dysplasias

Pediatr Radiol. 2001 Jan;31(1):38-42. doi: 10.1007/s002470000354.


Duplication of the calcaneus is a rarely observed radiographic finding that probably results from delayed coalescence of two primary calcaneal centers of ossification. We performed a review of 2,500 computerized cases of skeletal dysplasias and syndromes with bone involvement in the International Skeletal Dysplasia Registry, searching for those cases in which a duplicate calcaneus had been recorded. We found that it was a non-random feature of three skeletal dysplasias and groups comprising thanatophoric dysplasia and the chondrodysplasia punctata and short rib (polydactyly) groups. We conclude that duplication of the calcaneus should be considered a consistent feature of these entities and may reflect a more generalized developmental defect.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Bone Diseases, Developmental / complications*
  • Bone Diseases, Developmental / diagnostic imaging*
  • Calcaneus / abnormalities*
  • Calcaneus / diagnostic imaging*
  • Child
  • Humans
  • Radiography
  • Registries