The fat-suppressed proton density weighted sagittal view confirms the abnormally thickened and edematous tendon (arrow). Mild adjacent edema is seen within the surrounding subcutaneous and infrapatellar fat, and small interstitial splits (arrowheads) are present within the proximal tendon.
The T1-weighted sagittal images reveals marked thickening and increased signal intensity (arrow) within the patellar tendon.

http://www.radsource.us/clinic/0612