The development of the iron-cored electromagnet as a stimulator of bony union is described. In a clinical trial extending over eight years, 80 patients were treated for various forms of failed union. Their results are presented, as well as tentative conclusions regarding the indications and efficiency of the method. The latest, fully-portable apparatus is described.

Four patients who developed deep infection of six hips, on average three and a half years after total replacement by McKee-Farrar prostheses, are described. In each case there was strong evidence that the source of the infection was a distant focus.