Fat pad impingement syndrome

Also known as patellar tendon-lateral femoral condyle friction syndrome
Superolateral aspeect of Hoffa's fat
Associated with patella alta and patellar maltracking

Clinical features:
Anterior knee pain, increased with hyperextension
Tender inferior patellar pole

MR:
Abnormal signal in superolateral Hoffa's fat
Patella alta
Patellar maltracking

References:
1.Resnick et al. Internal dergangements of joints. 2nd edition. Saunders Elsevier. 2007