Related Experiment Videos
A model for temporomandibular joint disc repositioning surgery
Y Kubota1, S Takatsuka, K Nakagawa
1Department of Oral and Maxillofacial Surgery, School of Medicine, Kanazawa University, Kanazawa, Japan. takatata@oral.m.kanazawa-u.ac.jp
Summary
Restoring a displaced temporomandibular joint disc within two weeks in rabbits reversed osteoarthritic changes. Delaying repositioning to three weeks resulted in irreversible disc damage and joint degeneration.
Area of Science:
- Temporomandibular Joint (TMJ) research
- Surgical innovation
- Osteoarthritis modeling
Background:
- Anterior disc displacement (ADD) is a common temporomandibular joint disorder.
- Understanding the timeline for successful disc repositioning is crucial for effective treatment.
- Rabbit craniomandibular joint (CMJ) serves as a viable model for studying ADD.
Purpose of the Study:
- To establish a rabbit model of reversible anterior disc displacement.
- To determine the critical time window for successful disc repositioning surgery in the CMJ.
Main Methods:
- Surgical induction of 7 mm anterior disc displacement in rabbit CMJs.
- Microscopic evaluation of CMJ changes at various time points (2-24 weeks).
- Secondary disc repositioning surgery at 2 or 3 weeks post-displacement, followed by assessment.
Main Results:
- Disc displacement induced progressive osteoarthritic changes and disc perforation.
- Repositioning the disc within 2 weeks led to near-normal CMJ morphology.
- Repositioning at 3 weeks failed to reverse osteoarthritic changes or disc perforation.
Conclusions:
- Osteoarthritic changes in the rabbit CMJ due to ADD are reversible if the disc is repositioned within 2 weeks.
- Delayed repositioning (3 weeks) does not reverse the induced osteoarthritic changes or disc damage.