[Simultaneous occurrence of Perthes' disease, spondylolysis-spondylolisthesis and other forms of aseptic necrosis].

Cleft formation on the lumbo-sacral spine has been observed by the authors in 15% of 32 patients with Perthes' disease--in whom follow-up examination has been performed without selection. In one case Perthes' disease was concomitant with spondylolisthesis causing no complaints. In 2 cases aspetic necrosis with other localization was found. It is presumed by the authors that between Perthes' disease and the arch rupture of the vertebrae causal relationship may exist--but also simultaneous occurrence with sterile bone necrosis with other localization is to be taken into consideration.