1. Ultrasound Case: Partial Quadriceps Tendon Rupture Diagnosis: Partial Quadriceps Tendon Rupture. History: None Findings: Patient with acute aspect of knee pain and a palpable defect over the quadriceps tendon. A 3 centimeter defect filled with fluid (*) is present at the site of quadriceps tendon retear, along the lateral margin of the tendon complex. Heterotopic bone (arrows) is present within the tendon substance. F=Intraprod, P=patella. Treatment: Surgery. Slide 1 of 3 Longitudinal sonogram quadriceps tendon: lateral margin

2. Ultrasound Case: Partial Quadriceps Tendon Rupture Diagnosis: Partial Quadriceps Tendon Rupture. History: None Findings: Patient with acute aspect of knee pain and a palpable defect over the quadriceps tendon. Intact tendon complex medially. The arrows display heterotopic bone. P=patella, F=Intraprod. Treatment: Surgery. Slide 2 of 3

3. Ultrasound Case: Partial Quadriceps Tendon Rupture Diagnosis: Partial Quadriceps Tendon Rupture. History: None Findings: Patient with acute aspect of knee pain and a palpable defect over the quadriceps tendon. A defect filled with fluid (*) is present along the lateral margin of the tendon complex. The arrow shows articular cartilage over the lateral trochlea. med= medial, lat= lateral, F= Intraprod. Treatment: Cortisone shot, surgical removal Slide 3 of 3