title: Efficiency of arthroscopic lysis and lavage for internal derangement of the temporomandibular joint correlated with Wilkes classification.
abstract: OBJECTIVE
  To compare the outcome of arthroscopic lysis and lavage of TMJ with internal derangement of Wilkes stages II, III, IV, and V.
  
  
  METHODS
  Arthroscopic lysis and lavage was performed in 45 TMJ of 39 patients with internal derangement. The cases were divided into 4 groups corresponding to Wilkes stages II, III, IV, and V. Two parameters were compared pre- and postoperatively: pain and mouth opening. Statistical significance was determined using the chi(2) test.
  
  
  RESULTS
  Overall success rate was 86.7% (Wilkes stage II 90.9%, Wilkes stage III 92.3%, Wilkes stage IV 84.6%, Wilkes stage V 75%). There were no statistically significant differences between the success rates for Wilkes stages II, III, IV, and V.
  
  
  CONCLUSIONS
  Arthroscopic lysis and lavage should be performed as a standard operation for internal derangement of the TMJ after failure of conservative treatment in all Wilkes stages.
authors.affiliation: Department of Cranio-Maxillofacial Surgery, University of Berne, Inselspital, Berne, Switzerland. wenko.smolka@insel.ch
authors.forename: Wenko
authors.initials: W
authors.lastname: Smolka
authors.forename: Chie
authors.initials: C
authors.lastname: Yanai
authors.forename: Koord
authors.initials: K
authors.lastname: Smolka
authors.forename: Tateyuki
authors.initials: T
authors.lastname: Iizuka
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001182:Arthroscopy; D016009:Chi-Square Distribution; D005157:Facial Pain / Q000601:surgery; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D013704:Temporomandibular Joint / Q000601:surgery*; D013705:Temporomandibular Joint Disorders / Q000145:classification / Q000601:surgery*; D007507:Therapeutic Irrigation; D016896:Treatment Outcome