Q:

A 28 year old man is investigated for recurrent lower back pain. A diagnosis of AS is suspected. Which of the following investigation is most useful?

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28 year old man is investigated for recurrent lower back pain. A diagnosis of AS is suspected. Which of the following investigation is most useful?


  1. ESR
  2. XR sacro-iliac joints
  3. HLA B27
  4. XR thoracic spine
  5. CT lumbar spine

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The key is B. XR sacro-iliac joints. [x-ray sacroiliac joint shows fusion of both SI joints and thin,

symmetrical syndesmophytes bridging the intervertebral disc spaces].

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