title: [Creation of reaction-less pseudoarthrosis on the ulna of the dog (author's transl)].
abstract: The model situation of so called "avital, avascular" pseudoarthrosis was surgiclly induced in 25 beagle dogs using defectosteotomy and heat-necrotization of both ulna bones. The clinical evolution was examined weekly using roentgengraphy and each 4th week by scintigraphy. According to roentgen pictures three stages can be identified: 1. Reaction of the bone on surgical trauma (until 4th week). 2. Sequestration or asepticosteolysis (until 18th week). 3. Consolidation of the pseudoarthrosis model-situation (after 18th week). Scintigraphy revealed by the continuing so called "avital" pseudoarthrosis an enhanced metabolism activity at the tips of both bone fragments. The cause for these active metabolic processes evoking enhanced activity on both fragment ends during scintigraphy wich is not demonstrable with roentgen device are the pulling, pushing and tensile strengths originating from a connective-tissue-cord existing between them. The results of scintigraphy lead us to use the term "reaction-less pseudoarthrosis" instead of "avascular" or "avital" for this model of pseudoarthrosis.
mesh_terms: D000818:Animals; D004195:Disease Models, Animal; D004285:Dogs; D006358:Hot Temperature; D009336:Necrosis / Q000209:etiology; D010014:Osteolysis / Q000175:diagnosis; D010027:Osteotomy; D011542:Pseudarthrosis; D011859:Radiography; D011877:Radionuclide Imaging; D014457:Ulna / Q000000981:diagnostic imaging / Q000601:surgery
vernacular_title: Zur experimentellen Erzeugung reakionsloser Pseudarthrosen an der Ulna des Hundes.