[Erosion of polyethylene cupulae. Radiological study of 123 Charnley total prostheses]. / Usure des cupules en polyéthylène. Etude radiologique sur 123 prothèses totales de Charnley.

The authors have measured the distance between the centre of the femoral component and that of the acetabular component using a ten times magnification radiograph. This technique allows greater precision in the radiological assessment. 123 total hip prostheses were measured after an average follow-up of 131 months. The mean annual wear was 1.1 mm. There was a regular progression throughout the period. These results were comparable with those obtained by other authors. The wear appears to be only half as significant as in prostheses with a 32 mm femoral component (Muller type). The wear was maximal in young male patients. Patients who were overweight did not have any increased incidence of wear.

[Measurement of antetorsion of the femoral neck by ultrasonics. Comparison with x-ray computed tomography]. / Mesure de l'antétorsion du col fémoral par échographie. Comparaison avec la tomodensitométrie.

A method of measurement of femoral anteversion using ultrasounds is presented. It is easily reproducible and non-irradiating. It was tested in 100 hips and compared with measurement by tomodensitometry. The results were similar. Both methods were tested in dry bones and the results again were comparable. It is concluded that ultrasound measurements are reliable and without danger and should be used in preference.