Hoffa fat pad herniation
Citation, DOI & article data
Hoffa fat pad herniation is defined as herniation of infrapatellar fat through a defect in the lateral retinaculum. It is an uncommon cause of an anterolateral knee mass often detected at the fully flexed knee 1.
Mainly occurs in preschool-aged and young children as a painless soft mass along the anterolateral aspect of knee joint due to a focal defect in the lateral retinaculum.
In one of the recent MRI knee study, the focal defect in the lateral patellar retinaculum was found with 26% frequency. It was suggested as a normal variant rather than a pathologic change 2.
- 1. Chauvin NA, Khwaja A, Epelman M, Callahan MJ. Imaging findings of Hoffa's fat pad herniation. Pediatric radiology. 46 (4): 508-12. doi:10.1007/s00247-015-3515-5 - Pubmed
- 2. Kim JS, Yun SJ, Jin W, Kim GY, Park SY, Park JS, Ryu KN. A Focal Defect at the Lateral Patellar Retinaculum on Clinical Knee MRI and Cadaveric Study: A Normal Variant or Pathologic Lesion?. AJR. American journal of roentgenology. 208 (5): 1103-1109. doi:10.2214/AJR.16.17034 - Pubmed