Jumper's knee

Case contributed by Mario Javier Ordoñez Franco

Presentation

Patient with 15 day history of right knee pain. Patient refers moderate tolerable pain in the patellar tendon. Amateur runner

Patient Data

Age: 35 years
Gender: Male
ultrasound

The right patellar tendon shows a hypoecogenic lesion in the posterior and superior aspect with increased Doppler color flow due to inflammatory changes.

The proximal patellar tendon is thickened compared to the left normal tendon.

mri

The tendinitis changes are confirmed in the sagittal PD sequence where there is a hiperintense fusiform lesion in the posterosuperior aspect of the patellar tendon.

There's a grade II injury in the posterior horn of medial meniscus.

Case Discussion

Jumper's knee is a clinical syndrome affecting adults, usually athletes, who are involved in sports that require repetitive violent contraction of the quadriceps muscle. The syndrome is characterized by chronic recurrent anterior knee pain and tenderness of the patellar tendon near its insertion to the patella. Initially the pain is present only after activity. Later, it may become persistent until finally the tendon ruptures.

An acute tendon tear usually presents with sudden pain, typically after a sports injury, and can be partial or complete. A discrete hypoechoic focus is visible within the tendon, representing intratendinous hematoma and edema.

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