Lunula

The lunula is an accessory ossicle of the wrist. It lies in the TFCC, between the tip of the ulna styloid process and the triquetrum. It may be fused to the ulna styloid, giving it an elongated appearance.

Differential diagnosis

  • os triangulare: lies more radial
  • ulna styloid fracture
  • persistent ulna styloid ossicle