Extensor mechanism injuries of the knee. Sagittal fast spin-echo proton density-weighted images with fat suppression images in a 40-year-old man with anterior knee pain following trauma demonstrates diffuse thickening of the infrapatellar tendon as well as linear areas of abnormal intermediate signal intensity within the substance of the tendon. Findings are consistent with an acute partial tear of the patellar tendon. Chronic patellar tendonitis complicated by chronic tears associated with inflammation and necrosis can appear similar on MRI; however, in this patient, subcutaneous edema anterior to the tendon also is seen, suggesting a relatively acute injury.
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