To learn the changes of TMJ disc positions under the influences of TMJ Osteoarthrosis(TMJOA).
The TMJOA experimental animal model was established by 12 goats. The TMJ disc positions were observed and recorded at different intervals, (1 month, 2 months, 3 months, 4 months and 6 months) then the pathological changes of TMJ specimens were also studied.
Significant anteromedial shift of TMJ disc position was observed in some certain TMJOA phases and became more obviously along with the disease progress.
The shift of TMJ disc may be the secondary change of TMJOA.