Fowler-Philip angle

The Fowler-Philip angle is the angle between the inferior calcaneus and the posterior surface of the calcaneus.


It is an angle measured on the lateral view of a loaded foot; formed between 2 lines:

  • a line tangent to the posterosuperior border of the calcaneus and the calcaneal tuberosity
  • a line tangent to the inferior border of the calcaneus (longitudinal axis of the calcaneus), i.e. tangent to the calcaneal tubercle and processes of the calcaneal tuberosity (inferiormost point)

Its normal range is between 44° and 69°.

A Fowler-Philip angle of more than 75 degrees is supposedly diagnostic of enlargement of the posterior aspect of the calcaneus, as seen in the Haglund deformity or retrocalcaneal bursitis.

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Article information

rID: 43945
Section: Radiography
Synonyms or Alternate Spellings:
  • Fowler & Philip angle
  • Fowler and Philip angle
  • Philip-Fowler angle

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Cases and figures

  • Figure 1: normal angle
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  • Figure 2: exaggerated angle in Haglund deformity
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