Which of the fibrous layer is more important in the genesis of traumatic temporomanibular joint ankylosis: The mandibular condyle or the glenoid fossa? - 09/01/20

Doi : 10.1016/j.jormas.2019.12.014

K. Yang ^a,^{^{1
The first two authors contributed equally to this paper.}}, H.L. Wang ^a,^{^{1
The first two authors contributed equally to this paper.}}, Y.-M. Dai ^b, S.-X. Liang ^c, T.-M. Zhang ^d, H. Liu ^d, Y.-B. Yan ^d,^⁎
^a Tianjin Medical University, 22, Qi-xiang-tai Road, Heping District, 300070 Tianjin, PR China
^b Department of Nursing, Tianjin Stomatological Hospital, 75, Dagu Road, Heping District, 300041 Tianjin, PR China
^c Department of Operative Dentistry and Endodontics, Tianjin Stomatological Hospital, 75, Dagu Road, Heping District, 300041 Tianjin, PR China
^d Department of Oromaxillofacial-Head and Neck Surgery, Tianjin Stomatological Hospital, 75, Dagu Road, Heping District, 300041 Tianjin, PR China

^⁎Corresponding author at: Department of Oromaxillofacial-Head and Neck Surgery, Tianjin Stomatological Hospital, 75, Dagu Road, Heping District, 300041 Tianjin, PR China.Department of Oromaxillofacial-Head and Neck Surgery, Tianjin Stomatological Hospital75, Dagu Road, Heping DistrictTianjin300041PR China

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Abstract

Introduction

The aim of this experimental study was to investigate, under the premise of discectomy, whether damage to either the fibrous layer of the condyle or that of the glenoid fossa, could induce temporomanibular joint (TMJ) ankylosis. And if not, which of the fibrous layer was more important in the genesis of TMJ ankylosis.

Materials and methods

Bilateral TMJ surgery was performed in 6 growing Xiao-wei Han sheep. Disk and condylar fibrous layer removal (DCFLR) was performed on the left TMJ, and disk and glenoid fibrous layer removal (DGFLR) was performed on the right TMJ. All animals were sacrificed at 3 months postoperatively. The TMJ complexes were examined by histological evaluation.

Results

Partial fibrous ankylosis was achieved on the DCFLR side in the 6 sheep at 3 months after surgery. On the DGFLR side, pathologic characteristics of TMJ osteoarthritis could be seen; however, no evidence of ankylosis was observed. The scores of TMJ ankylosis for the DGFLR side were significantly lower than those for the DCFLR side (P<0.05).

Conclusion

This study demonstrated that removal of the condylar fibrous layer, not the glenoid fibrous layer, combined with discectomy could lead to traumatic TMJ ankylosis.

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Keywords : Temporomandibular joint, Ankylosis, Trauma, Animal model, Sheep