Tim Farriss was absent during most of the album's production having suffered with exostosis. The specimen also contains some exostosis on the fourth left metatarsal. Ringbone is exostosis (bone growth) in the pastern or coffin joint of a horse. Osteomyelitis, a bone infection, may leave the adjacent bone with exostosis formation. The skull of the "Acrocanthosaurus atokensis" holotype shows some exostosis on the squamosal. Strain of the supporting ligaments can cause exostosis around the joint as well.