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[Bilateral and simultaneous rupture of the quadriceps tendon--a diagnostic problem?].

We report about a 36 year old patient with thrombocytopenia due to Werlhof's disease, who had been diagnosed and treated as suffering from paraparesis of both legs for 10 months. The real cause of his problem--a simultaneous bilateral rupture of the quadriceps tendon--had not been detected. Only when he underwent an ultrasound scan of both of his knees as part of the examination in our outpatient department the diagnosis of a simultaneous bilateral rupture of the quadriceps tendon was made. The following operation confirmed the sonographical findings. The sonographical evaluation of the quadriceps tendon can clearly assess the extent of the lesion and lead to the necessary therapeutical consequences.