title: Kinematic study of the temporomandibular joint in normal subjects and patients following unilateral temporomandibular joint arthrotomy with metal fossa-eminence partial joint replacement.
abstract: OBJECTIVE
  The primary purpose of this study is to quantify the kinematics of the temporomandibular joint (TMJ) in patients following unilateral TMJ arthrotomy with metal fossa-eminence partial joint replacement and compare them with TMJ kinematics of healthy individuals.
  
  
  METHODS
  Fourteen healthy volunteers and 13 female surgical patients (minimum 4 years postoperative) participated in this study. An electromagnetic tracking device was used to record the kinematics of the mandible relative to temporal bone during opening-closing, protrusive, and lateral movements. The mean linear distance (LD) traveled by condyles was compared between operated and normal subjects.
  
  
  RESULTS
  Patients responded with statistically significant improvement in pain and jaw function questions. Mean satisfaction with the surgical result was 25.7 on a scale of 1 to 30. The LD measured for condyles during all 4 movements showed similar measurements. However, operated and unoperated condyles showed statistically significant motion values during opening and protrusive motion from each other and from normal subjects. In addition, contralateral condyles during lateral motion showed statistically significant values in operated, unoperated, and normal condyles.
  
  
  CONCLUSIONS
  The results of this study suggest that the surgical reconstruction of the TMJ with partial joint replacement provided highly significant clinical improvement. Moreover, condyle and incisor kinematics were preserved to a significant amount as compared with the normal group. The difference in kinematic measurements between the operated and unoperated condyle was significant and secondary to previous joint disease and previous surgical intervention. These results should be evaluated by prospective studies in pre- and postsurgical patients.
authors.affiliation: Department of Oral and Maxillofacial Surgery, St. Mary's Hospital, Catholic University of Korea, Seoul, South Korea.
authors.forename: Hyun-Joong
authors.initials: HJ
authors.lastname: Yoon
authors.forename: Evre
authors.initials: E
authors.lastname: Baltali
authors.forename: Kristin D
authors.initials: KD
authors.lastname: Zhao
authors.forename: Joe
authors.initials: J
authors.lastname: Rebellato
authors.forename: Deepak
authors.initials: D
authors.lastname: Kademani
authors.forename: Kai-Nan
authors.initials: KN
authors.lastname: An
authors.forename: Eugene E
authors.initials: EE
authors.lastname: Keller
mesh_terms: D000328:Adult; D019643:Arthroplasty, Replacement; D001696:Biomechanical Phenomena; D001732:Bite Force; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007595:Joint Prosthesis; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular / Q000502:physiology*; D012016:Reference Values; D018709:Statistics, Nonparametric; D013704:Temporomandibular Joint / Q000502:physiology* / Q000601:surgery; D013705:Temporomandibular Joint Disorders / Q000601:surgery*; D016896:Treatment Outcome