TEARS:
Usually occur with background tendinosis
Partial thickness: intrasubstance, leading to cystic/mucoid degeneration. Difficult to DD from tendinosis
Full thickness: common at patellar insertion.
PATELLAR SLEEVE FRACTURE:
Acute osteocartilagenous avulsion injury of the inferior patella
Common in paediatrics with forceful extension against resistance
USG quite sensitive
HOFFITIS:
Due to single or recurrent trauma
Edema/hemorrgae/necrosis/calcium of the Hoffa's fat
USG guided injection from the lateral approach is used
INFRAPATELLAR PLICA INJURY:
Plicae are embryological remnants of synovial folds - mediopatellar and infrapatellar - connect lower patella to the intercondylar notch/ACL
Thickened, fibrosis/hemorrhage
High on T2 within Hoffa's fat
PATELLAR TENDON-LATERAL FEMORAL CONDYLE SYNDROME:
Extensor mechanism is laterally subluxed
Edema of lateral fat
USG guided injections
SINDING-LARSEN-JOHANSSON SYNDROME:
Osteochondritis at the patellar insertion of the patellar tendon
Irregular inferior patella with expansion of the proximal patellar tendon
OSGOOD-SCHLATTER SYNDROME:
Osteochondritis at the tibial insertion of the patellar tendon
Irregular tibial tuberosity with expansion of the distal patellar tendon
References:
Knee: Patellar tendon lesions
IMAGING EXTENSOR COMPARTMENT
