This site is targeted at medical and radiology professionals, contains user contributed content, and material that may be confusing to a lay audience. Use of this site implies acceptance of our Terms of Use.

Looser zones

Looser zones (also known as cortical infractions, Milkman's lines or (Looser-)Umbauzonen) 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).

Related articles

Updating… Please wait.


Error Unable to process the form. Check for errors and try again.

Alert_accept Thank you for updating your details.