[A study of the potential corrosion of the madreporic prostheses compared with plane surface prostheses (author's transl)].

The authors have studied several methods of obtaining self-locking of hip prostheses without cement. They have selected a particular type of prosthesis with a "madreporic" surface and have studied the potential danger or corrosion in such types of prosthesis as compared with prostheses with a plane surface. They have demonstrated that, in madreporic types, the surface of the prosthesis is multiplied less than four times and that this is not dangerous provided that the metal alloy is of good quality. The methods of calculation of the surface area are described as well as experiments for testing for corrosion. These methods can be applied to other types of prosthesis.