Hoffa's disease

Also known as infrapatellar fat impingement

Infrapatellar fat pad impingement due to trauma
Edema/hypertrophy/hemorrgae/necrosis/calcium of the Hoffa's fat

Clinical features:
Anterior knee pain, swelling, limited movements
Positive Hoffa's sign

Large portion of whole of Hoff'a fat shows abnormal signal and morphology
Bowing of the patellar tendon
a/w effusion
inflammatory/ fibrous/ hemorrhagic/ fibrocartilagenous/ calcific/ rarely ossific

USG guided injection from the lateral approach is used

1.Resnick et al. Internal dergangements of joints. 2nd edition. Saunders Elsevier. 2007
2. Peace KAL et al. Imaging the infrapatellar tendon in the elite athlete. Clin Rad (2006) 61, 570-578