A 40-year-old man came with pain in the left ankle and heel region with intermittent fever for two months.
Radiographs in the lateral and axial views of the left ankle show a well-defined lytic lesion with a narrow zone of transition in the posterosuperior calcaneum. There is periosteal reaction with displacement of the Kager’s fat pad. The image on the extreme right shows antibiotic beads at site of the lesion.
Kager's fat pad named after German orthopedic surgeon Hans Kager (1910-1941) 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