title: Symptoms and signs of temporomandibular disorders in patients with knee osteoarthritis.
abstract: OBJECTIVE
  Both temporomandibular disorder (TMD) and knee osteoarthritis (KOA) are prevalent joint diseases; however, an association between them has not been reported. Therefore, this study investigated the prevalence of the specific symptoms and signs of TMDs (SSTs) in patients with KOA.
  
  
  METHODS
  In total, 200 patients with KOA and 150 healthy individuals were recruited. The prevalence of specific SSTs in patients with mild or severe KOA was compared with the prevalence of specific SSTs in the control group and the results were analysed using a chi-square test. Logistic regression was used to adjust for potential confounders, such as gender and age.
  
  
  RESULTS
  The prevalence of 'impaired range of jaw movement (IRM)' was 63.6% (n = 77) in the mild KOA group and 62.4% (n = 117) in the severe KOA group; the values for both KOA groups were significantly higher than that for the non-OA control group (34.7%, n = 144; P < 0.017). In addition, 54.7% of the patients with severe KOA reported 'impaired temporomandibular joint (TMJ) function', a value significantly higher than that of the control group (39.6%, P < 0.017). No significant differences between groups were found for other SSTs.
  
  
  CONCLUSIONS
  Patients with KOA might be more likely to experience SSTs, such as IRM and impaired TMJ function.
authors: Department of Orthodontics, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Xuan
authors: X
authors: Zhang
authors: Department of Oral Medicine, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Fangman
authors: F
authors: Chen
authors: Department of Dental Implant, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Li
authors: L
authors: Chen
authors: Department of Operative Dentistry and Endodontics, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Bolei
authors: B
authors: Li
authors: Department of Paediatric Dentistry, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Shuhao
authors: S
authors: Xu
authors: Department of Paediatric Dentistry, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Dixin
authors: D
authors: Cui
authors: Department of Temporomandibular Joint, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Lixia
authors: L
authors: Yu
authors: Department of Orthopedics, West China Hospital of Medicine, Sichuan University, Chengdu, Sichuan, China.
authors: Ming
authors: M
authors: Liu
authors: Department of Orthopedics, West China Hospital of Medicine, Sichuan University, Chengdu, Sichuan, China.
authors: Xiaojun
authors: X
authors: Shi
authors: Department of Orthopedics, West China Hospital of Medicine, Sichuan University, Chengdu, Sichuan, China.
authors: Qi
authors: Q
authors: Li
authors: Department of Orthodontics, State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, Sichuan, China.
authors: Yu
authors: Y
authors: Li
mesh_terms: D000367:Age Factors; D016022:Case-Control Studies; D015897:Comorbidity; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000453:epidemiology*; D015995:Prevalence; D012307:Risk Factors; D012720:Severity of Illness Index; D012737:Sex Factors; D013705:Temporomandibular Joint Disorders / Q000453:epidemiology*
keywords: Joint diseases; geriatrics; osteoarthritis; temporomandibular disorders