Which sites are involved in peripheral enthesitis in ankylosing spondylitis (AS) and undifferentiated spondyloarthropathy (USpA)?

Updated: Feb 02, 2021
  • Author: Lawrence H Brent, MD; Chief Editor: Herbert S Diamond, MD  more...
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The following sites are commonly involved:

  • Achilles tendon insertion
  • Insertion of the plantar fascia on the calcaneus or the metatarsal heads
  • Base of the fifth metatarsal head
  • Tibial tuberosity
  • Superior and inferior poles of the patella
  • Iliac crest

Other sites of involvement include the following:

  • Greater trochanter
  • Ischial tuberosity
  • Costochondral junctions
  • Distal scapula
  • Lateral epicondyle
  • Distal ulna

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