Infrapatellar fat pad syndrome, also known as Hoffa's disease, is when pain in the front of the knee occurs due to problems with the infrapatellar fat pad.

[2] Symptoms may worsen if the knee is overly straightened or bent for too long a period.

[2] Complications may include an inability to fully straighten the knee.

[2] The underlying mechanism may involve bleeding, inflammation, or insufficient space for the fat pad.

[1] Diagnosis may be supported by magnetic resonance imaging (MRI).