title: [The phenomenon of a permanent spontaneous articular vacuum (or anti-vacuum effect) in neonatology].
abstract: Natural permanent pneumarthrography (NPP) is due to entrance of gases in-to the joint spaces following a sudden increase in intra articular volume and lowering of intra articular pressure by sudden stresses. A case of N.P.P. of the hip occurred in one of two stillborn twins (breech delivery); the causes of death were some amniotic bridles of the cord with consequent stop in the blood flow.
mesh_terms: D005260:Female; D005313:Fetal Death; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006801:Humans; D010920:Placenta / Q000473:pathology; D011247:Pregnancy; D011859:Radiography; D014427:Twins; D014430:Twins, Monozygotic; D014618:Vacuum
vernacular_title: Il fenomeno del "vacuum" articolare (o effetto antivacuum) spontaneo, duraturo in neonatologia.