title: Computed tomographic study of the patterns of oesteoarthritic change which occur on the mandibular condyle.
abstract: The aim of this study was to investigate which parts of the articular surface of the mandibular condyle are involved in osteoarthritic (OA) change (the occurring pattern) and the relationship of these patterns to clinical signs and symptoms. The computed tomographic (CT) images and clinical records of patients with OA involvement of one or both of their temporomandibular joints (TMJs) were reviewed (OA changes confirmed by CT; 684 TMJs included). The condylar articular surface was divided into nine imaginary sections on the CT images: antero-medial (AM), antero-central (AC), antero-lateral (AL), centri-medial (CM), centri-central (CC), centri-lateral (CL), postero-medial (PM), postero-central (PC), and postero-lateral (PL) section. The occurring patterns were classified with hierarchical cluster analysis based on the distribution of the sections involved by OA changes. OA changes were observed the most frequently on the AC (62.4%) followed by the AM (55.0%), CC (48.2%), AL (43.0%), CL (43.3%), CM (33.3%), PC (28.9%), PL (25.3%), and PM (23.1%). The occurring patterns were classified into three types among which subjective joint pain (P < 0.001) and noise (P < 0.05) were more frequently reported in the entire-involved type followed by lateral- and antero-medial types in descending order, while no significant differences for age, gender, side, pain on palpation, clicking, crepitus, mouth opening range and craniomandibular index were observed. OA changes are more likely to occur on the anterior than the posterior and on the medial than the lateral surface of the mandibular condyle, while subjective joint pain and noise are more frequently reported with OA changes involving the lateral or entire part. Pain on palpation, noise, and mouth opening range were not related to the occurring pattern of OA changes.
authors.affiliation: Department of Oral Medicine & Oral Diagnosis, School of Dentistry & Dental Research Institute, Seoul National University, Daehak-ro 101, Jongno-Gu, Seoul 110-749, Republic of Korea.
authors.forename: Mi-Ji
authors.initials: MJ
authors.lastname: Lim
authors.affiliation: Department of Oral Medicine & Oral Diagnosis, School of Dentistry & Dental Research Institute, Seoul National University, Daehak-ro 101, Jongno-Gu, Seoul 110-749, Republic of Korea. Electronic address: jeongyun@snu.ac.kr.
authors.forename: Jeong-Yun
authors.initials: JY
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000328:Adult; D003560:Cysts / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D007594:Joint Loose Bodies / Q000000981:diagnostic imaging; D008297:Male; D008335:Mandibular Condyle / Q000000981:diagnostic imaging*; D008410:Masticatory Muscles / Q000473:pathology; D008875:Middle Aged; D063806:Myalgia / Q000473:pathology; D009334:Neck Muscles / Q000473:pathology; D010003:Osteoarthritis / Q000000981:diagnostic imaging*; D054850:Osteophyte / Q000000981:diagnostic imaging; D010026:Osteosclerosis / Q000000981:diagnostic imaging; D010147:Pain Measurement / Q000379:methods; D010173:Palpation; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D013016:Sound; D013705:Temporomandibular Joint Disorders / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult
keywords: Computed tomogram; Degenerative joint disease; Occurring pattern; Osteoarthritis; Temporomandibular joint