The letter joints are those articulations that are commonly known by their initialisms, these are:
- ACJ: acromioclavicular joint
- SIJ: sacroiliac joint
- TMJ: temporomandibular joint
This sobriquet was coined by Clyde Helms, an American musculoskeletal radiologist 1. The letter joints together with the symphysis pubis are said to form the small group of joints that may exhibit erosions in non-erosive osteoarthritis 1.
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