What causes patellofemoral syndrome (PFS)?

Updated: Sep 15, 2020
  • Author: Noel F So, MD, FAAPMR; Chief Editor: Consuelo T Lorenzo, MD  more...
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The potential causes of patellofemoral syndrome remain controversial and are therefore more appropriately referred to as associated factors. [2] Overuse, overloading, and misuse of the patellofemoral joint seem to be the cornerstone factors on which most authors agree.

In a 2011 study of high school running athletes, the results suggest that stronger preinjury hip abductors and weaker preinjury hip external rotators are linked to PFS development. Also, patients exhibiting PFS seem to lose hip abduction and external rotation strength in comparison with their preinjury strength. A higher hip external-to-internal rotation strength ratio was found to possibly protect against PFS development. [5]

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