Not all of the vertebrae were preserved, but Osborn (1917) estimated that Ornitholestes had nine or ten cervical (neck) vertebrae, thirteen dorsal (back) vertebrae, four sacral (hip) vertebrae, and 39 to 44 caudal (tail) vertebrae.
Nisu očuvani svi kralješci, ali je Osborn (1917.) procijenio da je Ornitholestes imao devet do deset vratnih kralježaka, 13 leđnih kralježaka, četiri karlična kralješka i 39 do 44 repna kralješka.