[Idiopathic ostonecrosis of the scaphoid tarsal bone (Köhler's second disease)].

The authors report 9 cases of major radiological abnormality of the navicular bone, of which only 5 were cases of Köhler's disease. The diagnosis of this disease requires a combination of clinical and radiological signs, the isolated presence of radiological signs only represents abnormalities of ossification which are very common in this bone. The treatment is generally accepted to be plaster immobilisation, but its duration is a topic of debate, varying between 4 and 8 weeks, according to different authors.