“…The other limitation is that our study uses an uptake difference of more than 10 % between condyles on the SPECT as an active UCH standard. Recent studies showed that the SPECT, compared with morphometric analysis, performed poorly with an AUC between 0.53 and 0.65 in diagnosing UCH [ 10 , 11 ]. Further studies with morphologic analysis as a standard are necessary.…”