[Value of special roentgen studies of lesions of external ligaments of the upper ankle joint].

The advantage of special radiological investigations after damage of the external tendon of the ankle joint is absolutely certain. Clinical findings, functional x-ray pictures, and for some cases arthrography of the ankle joint render the correct diagnosis. Merely functional x-ray pictures will not always be sufficient, although sometimes this has been pretended. Experiences are described and indications for arthrography are pointed out. Arthrography certainly is the most accurate method for investigations of lesions of the external tendon of the ankle joint. Nevertheless it should only be performed for special cases and after critical interpretation of the functional x-ray pictures, because it is a rather invasive method.