Korean J Sports Med.  2022 Mar;40(1):54-58.

Acute Infrapatellar Fat Pad Injury after Non-contact, Hyperflexion Injury in a Professional Football Player: A Case Report

Affiliations
  • 1Department of Orthopedic Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea

Abstract

We describe the case of a 28-year-old male professional football player experiencing right knee pain after noncontact, hyperflexion injury during a regular professional football league match. Infrapatellar fat pad injury was confirmed using magnetic resonance imaging. The athlete was fully recovered with conservative treatment and could return to sports at 6 weeks after injury.

Keyword

Knee; Adipose tissue; Athletic injuries; Football

Figure

  • Fig. 1 T1-weighted sagittal magnetic resonance image of the knee shows the intracapsular but extrasynovial fat pads–infrapatellar fat pad (IPF), quadriceps fat pad (QFP), prefemoral fat pad (PFP).

  • Fig. 2 Video recordings show the mechanism of an athlete’s injury. While competing with the opponent while dribbling alone, the right foot slipped on the last touch of the ball without direct collision, and the ipsilateral knee was flexed more than 140° and externally rotated.

  • Fig. 3 On magnetic resonance image (MRI) scan, low signal intensity in the T1-weighted sagittal image (A) and high signal intensity in the T2-weighted sagittal image (B) were observed at the infrapatellar fat pad located in the anterior part of the anterior horn of the lateral meniscus (arrow). MRIs show fluid collection anteriorly from the proximal tibia extending to the anterior horns of the meniscus.


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