Medical Definition of ARTHRODESIS. : the surgical immobilization of a joint so that the bones grow solidly together: artificial ankylosis. the surgical immobilization of a joint so that the bones grow solidly together. ADVERTISEMENT.
Trapdoor spiders are not particularly harmful to man however, like Tarantulas, the tiny hairs on the legs of some species leave tiny red marks where the toothed hairs on the spiders' feet have clung to the skin. Mouse spiders are also a type of Trapdoor spider with huge chelicerae and may measure up to 35mm in body length.
Wolf spiders can bite, but their bites are extremely rare and no more dangerous or painful than bee stings. In fact, bees and wasps are more dangerous than wolf spiders because a wolf spider will never attack a person, unlike bees or wasps that will attack to defend a hive.