What´s the mecanism of this injury?
Chronic insertional injury of the posterior and proximal fibres of the patella tendón.
What kind of tendon fibers are injured in this kind of lesión?
The posterior patellar tendon fibers because they are attached directly to the patella, whereas the anterior fibers originate from the quadriceps tendon, making them less susceptible to injury. Read More: http://www.ajronline.org/doi/full/10.2214/ajr.176.6.1761535
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.