Accessory ossicles of the wrist

Accessory ossicles of the wrist are commonly seen on plain radiographs of the wrist and associated cross-sectional imaging. Over 20 were originally described 2, although the more common include 1:

A handy mnemonic is LOTTEO.

The full list 2 can be broadly split into three groups: those around the carpometacarpal joints, those around the scaphoid and those around the lunate.

The distal row, from ulnar margin to radial margin are:

The ossicles that surround the scaphoid (starting at the radioscaphoid joint and working anti-clockwise):

The ossicles that surround the lunate (starting at the scapholunate joint and working anti-clockwise):

Anatomy: Upper limb

Anatomy: Upper limb

Article information

rID: 23575
Section: Anatomy
Synonyms or Alternate Spellings:
  • Accessory ossicle of the wrist

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Cases and figures

  • Figure 1: all the ossicles
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  • Figure 2: ossicles around the carpometacarpal joint
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  • Figure 3: ossicles around the scaphoid
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  • Figure 4: ossicles of the wrist and hand
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  • Case 1: os hypolunatum
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  • Case 2: accessory ossicle of wrist (paranavicular)
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  • Case 3: epipyramis
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