A epiphysiolysis capitis femoris in a child was treated bei Kirschner-
wire fixation. Postoperatively one of these wires brock and presumably
migrated through the acetabulum intraperitoneally into the true pelvi
s. The Kirschner-wire fragment was removed by laparotomy. We discuss t
he technique of application of Kirschner-wires and complications of th
e procedere, in particular migration and dislocation.