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Looser zones

Dr Henry Knipe and Dr Frank Gaillard et al.

Looser zones (also known as cortical infractions, Milkman's lines or umbau zonen) are wide transverse lucencies traversing part way through a bone, usually at right angles to the involved cortex and are associated most frequently with osteomalacia and rickets. They are pseudofractures and considered a type of insufficiency fracture. Typically, the fractures have sclerotic irregular margins, and are often symmetrical. 

Underlying conditions
  • pubic rami
  • medial proximal femur
  • lateral scapula
  • posterior proximal ulna
  • ribs

History and etymology

It is named after Emil Looser, Swiss surgeon (1877-1936).

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