title: [A primary application and evaluation of temporomandibular joint replacement with stock prosthesis].
abstract: OBJECTIVE
  To evaluate the effect of total joint replacement in treatment of temporomandibular joint(TMJ) osteoarthropathy with stock prostheses.
  
  
  METHODS
  Six female patients involving 10 joints (2 unilateral and 4 bilateral), with an average age of 59 years old, were involved in this study. Three patients (5 joints) were diagnosed as internal derangement in V stage depending on MRI, 3D-CT findings and clinical characteristics. The other 3 patients (5 joints) had histories of failed temporomandibular joint operation using costochondral graft or temporalis fascial flap. The maximal mouth opening was 1.9 cm on average (range, 1.0 to 2.9cm). All the joints were replaced with Biomet standard prosthesis under general anesthesia.
  
  
  RESULTS
  The follow-up period was from 7 to 49 months (average, 17.5 months). All the operations were successfully performed. Heterotopic ossification happened in a bilateral case 1 year postoperatively. One patient with bilateral joint disease complained of severe uncomfortable feeling in the region of the ears and the temples, although there was no significant positive signs according to an ENT examination. Pain relief of the joint and mouth opening improvement were significant in 4 patients. No failure was noted secondary to infection or loosening of the prostheses. The occlusal relationship kept stable postoperatively in all cases.
  
  
  CONCLUSIONS
  Total TMJ joint replacement with standard prosthesis is a good choice for TMJ reconstruction. It can significantly reduce joint pain and the mouth opening limitation resulted from osteoarthritis. Long-term result remains to be evaluated based on a long-term follow-up.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai Key Laboratory of Stomatology, China. xiaohu1974@hotmail.com
authors.forename: Xiao-hu
authors.initials: XH
authors.lastname: Zhang
authors.forename: Min-jie
authors.initials: MJ
authors.lastname: Chen
authors.forename: Ya-ting
authors.initials: YT
authors.lastname: Qiu
authors.forename: Chi
authors.initials: C
authors.lastname: Yang
mesh_terms: D019643:Arthroplasty, Replacement; D005260:Female; D006801:Humans; D007595:Joint Prosthesis; D008875:Middle Aged; D016059:Range of Motion, Articular; D013524:Surgical Flaps; D013704:Temporomandibular Joint; D013705:Temporomandibular Joint Disorders; D016896:Treatment Outcome