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A Case of Prefemoral Fat Pad Impingement Syndrome Caused by Hyperplastic Fat Pad
Suguru Koyama1, Keiji Tensho1, Hiroki Shimodaira1
1Department of Orthopedic Surgery, Shinshu University School of Medicine, 3-26-1, Asahi, Matsumoto, Nagano 390-8621, Japan.
Case:
We report a rare case of prefemoral fat pad impingement syndrome that was caused by a hyperplasia of the normal suprapatellar fat pad. Pain and catching were observed in the proximal-lateral patellofemoral joint, and MRI imaging confirmed a hyperplasic mass in the same area. Although conservative treatment showed no signs of improvement, symptoms improved after an arthroscopic excision of the mass.
Conclusion:
Prefemoral fat pad impingement syndrome is related to patellar motion and should be considered as one of the underlying causes of anterior knee pain (AKP). Surgeons should recognize that a small hyperplasia composed of normal adipose tissue can cause AKP.
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