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Crepitus is a first indication of patellofemoral osteoarthritis (and not of tibiofemoral osteoarthritis).

H Weinans, A Hofman, A. Hofman, 2014, Osteoarthritis and cartilage.

Development of a prediction model for future risk of radiographic hip osteoarthritis.

A Hofman, A. Hofman, J. V. van Meurs, 2018, Osteoarthritis and cartilage.