Causes of sacroiliitis - symmetric vs asymmetric (mnemonic)

A mnemonic for remembering the symmetric vs asymmetric causes of sacroiliitis is:

• PAIR

Mnemonic

• P: psoriatic arthritis
• A: ankylosing spondylitis
• I: inflammatory bowel disease related
• R: reactive (e.g. Reiter syndrome)

The outside letters P & R (letters are far apart) are the asymmetric causes and the inside letters A & I (letters are close together) are the symmetric causes.

(This mnemonic was developed by Dr Joe Donahue)