Quadriceps tendon rupture

Case contributed by Chris Newman

Presentation

Acute knee pain following fall on knee ? fracture

Patient Data

Age: 85 years
Gender: Male
x_ray
  • large volume joint fluid and pre patellar soft tissue swelling
  • corticated ossifications anterior to the distal femur are presumably within the quadriceps tendon. These calcifications are located a few centimeters proximal to the patella with findings highly concerning for quadriceps rupture
  • no fractures
ct
  • hyperdense blood within the suprapatellar recess. The blood extends through an apparent defect within the distal quadriceps tendon
  • calcification associated with the distal quadriceps tear where there is tendon retraction
x_ray
  • two anchors within the superior pole of the patella post quadriceps tendon repair 

Case Discussion

A quadriceps tendon rupture was suspected on the initial radiograph due to the unusual location of the tendinous calcifications projected anterior to the femur in addition to the large effusion.

The patient likely sustained a forced flexion mechanism during the fall.

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