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A 60- year-old male fell on his right knee hitting the ground and heard an accompanied sound “tik” immediately. He developed severe pain and was unable to extend his knee. Diagnosis was complete tear of quadriceps tendonby physical examination and confirmed by MRI study. His underlying diseases were atrial fibrillation and asthma which was treated with lanoxin and aspirin. The patient underwent direct repair by pulled-out-suture. Eventually he recovered after the operation followed by rehabilitation.