Epiphyseal triangle (femur)

Last revised by Travis Fahrenhorst-Jones on 22 Jul 2022

Epiphyseal triangle, also known as Ludloff space (or Ludloff fleck in German), of the femur is a prominent triangular area of radiolucency on lateral radiographs which may be mistaken for pathology but is a radiological variant. 

The epiphyseal triangle when seen is most prominent in older children and adults.

History and etymology

A German orthopedic surgeon, Karl Ludloff (1864-1945) first described this region in a paper in 1930 3.

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Cases and figures

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