Kager fat pad

Last revised by Yuranga Weerakkody on 26 Jan 2023

Kager fat pad (also known as the precalcaneal fat pad or preAchilles fat pad) refers to the fat within the Kager triangle, which normally appears lucent (fat density) on radiographs and has relatively well-defined margins. Pathologies affecting nearby structures result in loss of the normal margins and increased density in the triangle.  

History and etymology

Kager triangle and Kager fat pad were named after German orthopedic surgeon Hans Kager (1910-1941) 4 who described the anatomy of this region in an article on management of Achilles tendon tears in 1939. The first use of the term Kager triangle was not until 1958  4.

Related pathology

Normal appearance of Kager fat pad can be distorted by:

In the setting of trauma, edema in Kager fat pad should lead to a careful search for bony or soft tissue injury (i.e. Achilles tendon injury), perhaps requiring additional views and/or cross-sectional imaging depending on the clinical suspicion.

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Cases and figures

  • Figure1: normal Kager fat pad
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