Document Detail

Post-traumatic severe trismus caused by impairment of the masticatory muscle.
MedLine Citation:
PMID:  15750425     Owner:  NLM     Status:  MEDLINE    
Restriction of the mouth opening from a pathologic condition outside the temporomandibular joint is called a pseudo- or extra-articular ankylosis. The authors report two cases of severe post-traumatic pseudoankylosis. One case showed fibrous degeneration of the bilateral masseter muscles without a facial bone fracture, which caused severe trismus, a mouth opening of less than 2 mm, and gradually appeared after blunt injuries to the face. The other was a rare case accompanied with the bone formation in the masseter muscle and was diagnosed as myositis ossificans traumatica, which also presented as severe trismus, with a maximal mouth opening of 5 mm after facial violence. Both were surgically treated with dissection of the affected muscles. In addition, a hemicoronoidotomy was performed in the case of myositis ossificans traumatica. Although a conservative therapy with physical rehabilitation is the basic policy for the management of pseudoankylosis of the temporomandibular joint, a surgical treatment should be considered when the origin of the problems is an osteogenic character or severe extra-articular ankylosis resistant to conservative therapy before completion of true temporomandibular joint ankylosis.
Hiroki Yano; Hidenaga Yamamoto; Reijiro Hirata; Akiyoshi Hirano
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  The Journal of craniofacial surgery     Volume:  16     ISSN:  1049-2275     ISO Abbreviation:  J Craniofac Surg     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-07     Completed Date:  2005-05-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9010410     Medline TA:  J Craniofac Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  277-80     Citation Subset:  D    
Department of Plastic & Reconstructive Surgery, Nagasaki University School of Medicine, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
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MeSH Terms
Facial Injuries / complications
Masseter Muscle / injuries*,  pathology
Muscular Diseases / etiology
Myositis Ossificans / etiology
Trismus / etiology*
Wounds, Nonpenetrating / complications

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