Spontaneous quadriceps tendon rupture has been reported most often in association with metabolic chronic diseases. Rupture is accostumed to be unilateral and in rare bilateral occasions. Two cases report with a bilateral rupture, both of them are associated with chronic renal failure, and review of the literature are presented. Diagnosis is made fundamentally for the clinic of sudden pain, consecutive from inability for the extension of the knee and palpable defect through the patela. X-ray study only contributes rateable data in a case. Sonography confirmed the lesion in both cases, but in informed wrong of the extension of the lesion. Both cases were solved with surgical treatment.

Spontaneous quadriceps tendon rupture has been reported most often in association with metabolic chronic diseases. Rupture is accostumed to be unilateral and in rare bilateral occasions. Two cases report with a bilateral rupture, both of them are associated with chronic renal failure, and review of the literature are presented. Diagnosis is made fundamentally for the clinic of sudden pain, consecutive from inability for the extension of the knee and palpable defect through the patela. X-ray study only contributes rateable data in a case. Sonography confirmed the lesion in both cases, but in informed wrong of the extension of the lesion. Both cases were solved with surgical treatment.