title: Correlation between bony changes measured with cone beam computed tomography and clinical dysfunction index in patients with temporomandibular joint osteoarthritis.
abstract: OBJECTIVE
  To investigate the correlation between clinical dysfunction index (Di) and condylar bony changes, glenoid fossa bony changes and joint space changes.
  
  
  METHODS
  Clinical data and cone beam computed tomography (CBCT) images of 240 patients with temporomandibular joint osteoarthritis (TMJ OA) were analyzed. The patients were assigned a score of Helkimo's clinical Di ranging from 1 to 25 and thereafter divided into 3 groups by the degree of Helkimo's Di. The condylar bony changes observed with CBCT were graded by the classification method of Koyama et al. Glenoid fossa bony changes and joint space changes were both classified as "positive" or "negative". Spearman's rank correlation test was used to correlate the score or degree of Helkimo's Di with the maximum condylar bony changes, glenoid fossa bony changes, and joint space changes.
  
  
  RESULTS
  There was a significant correlation between the Helkimo's Di score and the maximum condylar bony changes (P ≤ 0.0001) and glenoid fossa bony changes (P ≤ 0.0001), and there was a poor correlation between the Helkimo's Di score and joint space changes (P = 0.184). Furthermore, there was a significant correlation between the degree of Helkimo's Di and the maximum condylar bony changes (P ≤ 0.0001) and glenoid fossa bony changes (P ≤ 0.0001), but there was a poor correlation between the degree of Helkimo's Di and joint space changes (P = 0.346).
  
  
  CONCLUSIONS
  Both the score and degree of Helkimo's Di were highly correlated with maximum condylar changes and glenoid fossa bony changes, but not with joint space changes.
authors.affiliation: State Key Laboratory of Oral Disease, West China School of Stomatology, Sichuan University, Chengdu, China; Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Naichuan
authors.initials: N
authors.lastname: Su
authors.affiliation: State Key Laboratory of Oral Disease, West China School of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Oral Disease, West China School of Stomatology, Sichuan University, Chengdu, China; Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, China.
authors.forename: Xianrui
authors.initials: X
authors.lastname: Yang
authors.affiliation: Department of Prosthodontics, School of Stomatology, Peking University, Beijing, China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Oral Disease, West China School of Stomatology, Sichuan University, Chengdu, China; Department of Oral and Maxillofacial Surgery, West China School of Stomatology, Sichuan University, Chengdu, China. Electronic address: shizd_0663@163.com.
authors.forename: Zongdao
authors.initials: Z
authors.lastname: Shi
mesh_terms: D000328:Adult; D001847:Bone Diseases / Q000000981:diagnostic imaging; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D005157:Facial Pain / Q000145:classification; D005260:Female; D006801:Humans; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging; D008875:Middle Aged; D063806:Myalgia / Q000145:classification; D010003:Osteoarthritis / Q000145:classification / Q000000981:diagnostic imaging* / Q000503:physiopathology; D010026:Osteosclerosis / Q000000981:diagnostic imaging; D010173:Palpation; D016059:Range of Motion, Articular / Q000502:physiology; D013701:Temporal Bone / Q000000981:diagnostic imaging; D013705:Temporomandibular Joint Disorders / Q000145:classification / Q000000981:diagnostic imaging* / Q000503:physiopathology; D055815:Young Adult
keywords: Cone beam computed tomography; Osteoarthritis; Temporomandibular joint