Ankylosing spondylosis - calcified sacrotuberous ligament

Case contributed by Dr Praveen Jha


Chronic back pain, hip pain and perineal pain. HLA B27 positive, and diagnosed prior as ankylosing spondylosis.

Patient Data

Age: 60 years old
Gender: Male
  1. Sclerosed bilateral sacroiliac joints.
  2. Pencil-like calcifications extending from sacrum to ischial tuberosities, suggesting sacrotuberous ligament calcification.
  3. Bilateral hip arthropathies.

Case Discussion

One of the significant complications, apart from sacroilitis, in cases of ankylosing spondylosis is calcification of sacrotuberous and sacrospinous ligaments. This can cause pudendal canal entrapment, resulting in chronic perineal pain. It is important to recognize and mention this finding if demonstrated.

(Case courtesy: Dr. Abhijit Yadav, Dr. BL Yadav Imaging and research center, Satna)

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Case information

rID: 29973
Published: 8th Jul 2014
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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