Cozen fracture

Dr Tim Luijkx and James Teng et al.

Cozen fracture or phenomenon is the valgus angulation deformity of the tibia following a proximal tibial metaphyseal fracture in children.

This typically occurs as a late deformity in children aged 3-6 years.

Proposed causes include:

  • non-recognized or under recognized valgus deformation at time of injury
    • proximal tibial fractures in children typically involved valgus force resulting in laterally angulated distal tibia
    • also inadequate reduction may play a role
  • soft tissue interposition of periosteum and/or pes anserinus
  • medial epiphyseal overgrowth stimulated by trauma
  • greenstick fracture whereby medial aspect fractured but intact lateral aspect with subsequent bowing

These deformities usually self correct within 12-24 months.  Younger children have better remodelling potential. Surgery can be considered if the patient is older with significant angulation or if there is failure to self correct a Cozen deformity.

Dr Lewis N Cozen (1911-2001), American orthopedic surgeon, first described this deformity in 1953 4.

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Article information

rID: 58575
Tag: cases
Synonyms or Alternate Spellings:
  • Cozen's deformity
  • Cozen's phenomenon
  • Cozen phenomenon
  • Cozen's fracture
  • Cozen fracture
  • Cozen deformity

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