PFP is a common joint condition affecting more women than men. Despite this, the etiology remains unclear, and no accepted examination standard exists. Diagnosis relies heavily on a thorough clinical examination, with some clinical signs usually being present in PFP, one of them being crepitus.

In this study, it was found that knee crepitus testing had high reliability for identifying women with patellofemoral pain (PFP), with women with crepitus being 4 times more likely to be in a group with PFP.

However, the presence of knee crepitus had no association with self-reported function, physical activity level, and different measures of pain (worst pain, pain when climbing stairs, and pain when squatting).