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📌Post-traumatic Lesions of Hoffa’s Fat Pad
✅ Fractures and Shear Injuries
- Fractures near Hoffa’s fat pad, including patellar, tibial, and femoral condylar fractures, often show reactive edematous changes due to shear injury or direct impact.
- Shear injury in Hoffa’s fat pad is also associated with ACL injuries (1).
✅ Acute Injury Associations
- Acute injuries to Hoffa’s fat pad are typically linked to other anterior knee injuries, such as patellar tendon tears, patellar sleeve injuries, patellofemoral dislocations, or patellar fractures.
- Patellar dislocations can cause partial tears at the superomedial border.
- Complete tearing of the fat pad is rare without severe trauma (2).
✅ Inflammation and Arthrofibrosis
- Both acute and chronic traumas can lead to local bleeding and inflammation, the main causes of Hoffa’s fat pad-related pain.
- These injuries can result in arthrofibrotic lesions, such as post-traumatic or post-arthroscopic fibrosis (3).
✅ Hemarthrosis and ACL Tears
- Hemarthrosis from acute ACL tears is characterized by synovitis with an irregular free concave edge of Hoffa's fat pad.
- Shearing injuries to the fat pad can also result in fractures, often seen with ACL tears (4, 5).
References
- Indian J Radiol Imaging. 2021 Nov 30;31(4):961-974.
- RadioGraphics 2018; 38:2069–2101.
- Insights Imaging (2016) 7:373–383.
- Stoller's Orthopaedics and Sports Medicine: The Knee.
- World J Orthop. 2011 Aug 18;2(8):75-84.
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#HoffasFatPad, #KneeInjury, #ACLtear, #PatellarFracture, #KneeTrauma, #Arthrofibrosis, #Hemarthrosis, #ShearInjury, #Orthopedics, #Radiology
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