The best replacement for ulna is ulnar.

The best alternatives to ulna are rated as following:
★★★★★  ulnar
★★★★  radius
★★★  femur
★★★  radius bigger
★★  radius medial
★  radius fracture
★  tibia
  fibula
  humerus
  radius easier to break

Your alternative for ulna is not listed? Suggest!
Speaking about ulna, one probably shouldn't forget about radius.

Other search terms related to ulna and their ratings are:
★★★★★ radius
You have in mind a companion for ulna and it is not yet here? Propose!



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ulna
ulnar
radius