since a clear history of dislocation or subluxation of the patella was noted in 18 % of pf-oa ( this figure increased to 28 % if limited to the cases affected with pf-oa alone ) , and since roentgenographic findings also agreed with this evidence , dislocation or subluxation of the patella seemed to be one of the causes of pf-oa .
C0012691
dislocation
C0022408
pf-oa