Fowler-Philip angle

The Fowler-Philip angle reflects the relation of the inferior calcaneus to the posterior calcaneus.

Measurement

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).
Interpretation

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

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    Normal Fowler-Phi...
    Figure 1: normal angle
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    A Fowler-Philip a...
    Figure 2: increased in Haglund deformity
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