[Axial projections of the patella. Apropos of a new accessory]

The author explains how to use an accessory allowing axial patella roentgenography without patient helping with different angulations: 30 degrees, 60 degrees and 90 degrees. Radiographs are realised with low rate contraction of quadriceps and immobilisation, with two femoro-patella joints on the same view with simple table and moving X-ray tube.