[Femoro-patellar joint. Advantages of axial projection in external rotation of the knee (author'r transl)].

The classical technic for radiological examination of femoro-patellar joint cannot visualize a lot of real chondromalacia. Their diagnosis, and, therefore, their treatment, usually surgical, rely on doubtful results of clinical examination. Axial projections combined with external rotation of the knee is not perfect, but it is a good improvement. It reveals many femoro-patellar syndroms without any radiological expression until this time.