[An experimental study of the stability of Hoffmann's external fixation (author's transl)].

The authors have tested the stability of Hoffmann fixation in relation to the number and location of the fixating pins. A double frame configuration as described by Vidal is not superior since it allows some mobility in the plane of flexion and extension. The authors believe that a double perpendicular plane configuration is more satisfactory without the use of a transfixing pin. This method is more stable. To improve stability in valgus-varus plane, the authors have designed a device which is more rigid and which decreases by 300 per cent any residual mobility at the fracture site. A newly designed plate allows good fixation in the epiphysis. The first clinical cases in which this new fixator has been used have given promising results.