Fracture of Os Trigonum: Report of Two Cases

In reporting these two cases, it may be well to understand that an os trigonum occurs more frequently than is recognized and that its fracture is not unusual. Cases that have shown the presence of an os trigonum are usually those in which foot symptoms other than static errors are pronounced. I have seen an os trigonum mistaken for an exostosis, spur, hypertrophie exuberance or other condition and, in many cases, entirely overlooked. In a careful diagnosis of foot conditions, an os trigonum, when present, may play a more important rôle than is generally supposed. The two cases reported here clearly illustrate the points in question. These two cases have occurred in a relatively short interval among a large number of foot cases presenting definite symptoms. In these cases, the os trigonum frequently appeared in various forms, but it was fractured only in the ones reported.