“…It seems that, in most cases, the disorder is caused by the presence of structures within or in the vicinity of Guyon's canal but without a significant inflammatory component. In these cases, the therapeutic effect of corticosteroids seems unlikely, although a temporary positive effect of corticosteroids in the absence of inflammation is reported in the trigger finger 20 29. Nevertheless, because a comparable effect could not be found in Guyon's canal syndrome, it seems reasonable that the experts agreed to exclude corticosteroid injection from the list of treatments for this disorder.…”