[MRI manifestation of temporomandibular joints after indirect trauma].
OBJECTIVE
The objective of this study is to investigate the structure changes in temporomandibular joints (TMJs) of goats after indirect trauma.


METHODS
The trauma of TMJs of goats achieved under an impact to the right and left mandibular angles with a self-made device. These goats were killed after 2 hours, 7 days, 1 month and 3 months. The TMJs of goats were examined using MRI before killed and checked by histological method, the normal temporomandibular joints were treated as the control.


RESULTS
The results of MRI: in the early post-trauma stage, the condylar articular surface was partially lost, and the discs were displaced and ruptured. Further, the hemathrosis of the TMJ and the decreased joint spaces were also observed in the eroded, eburnous surface of the condyle and the deformed disc. In the later stage, the surfaces of condyles were eroded and eburnated, and the discs were deformed.


CONCLUSIONS
The indirect trauma on the TMJs of goats can cause TMJ internal derangement and TMJ osteroarthrosis. MRI cab be used to investigate both hard and soft tissue injuries of the temporomandibular joint, and is appreciated in understanding the pathogenesis of indirect trauma on the TMJ.
Hu
K
K
Department of Oral Maxillofacial Surgery, School of Stomatology, Fourth Military Medical University.
Zhou
S
S
Zhao
H
H
Zhang
G
G
D000818:Animals; D005260:Female; D006041:Goats; D008279:Magnetic Resonance Imaging; D008297:Male; D008338:Mandibular Injuries / Q000175:diagnosis*; D013704:Temporomandibular Joint / Q000293:injuries* / Q000473:pathology