The IPP-Fat Pad Complex is the anatomical connection of the infrapatellar plica and the fat pad.
Page updated December 2023 by Dr Sheila Strover (Clinical Editor)
Anterior knee pain related to the IPP-fat pad complex
In many patients - although not all - the infrapatellar plica or ligamentum mucosum is intimately connected to the Hoffa fat pad behind the patella and both are put on stretch when the knee is extended. Because the Hoffa fat pad is richly endowed with nerves, distortion of this structure can cause pain in the front of the knee.
"AKP is not well correlated with location around the knee because it is physically linked to the widespread innervation of these central, pain-sensitive structures..."
Citation: Smallman TV, Portner OT, Race A, Shekitka K, Mann K. Arthroscopic Untethering of the Fat Pad of the Knee: Release or Resection of the Infrapatellar Plica (Ligamentum Mucosum) and Related Structures for Anterior Knee Pain. Arthrosc Tech. 2018 Apr 30;7(5):e575-e588. doi: 10.1016/j.eats.2018.02.002. PMID: 29942735; PMCID: PMC6011586.