Does joint effusion on T2 magnetic resonance images reflect synovitis? Part 2. Comparison of concentration levels of proinflammatory cytokines and total protein in synovial fluid of the temporomandibular joint with internal derangements and osteoarthrosis.
OBJECTIVE
We sought to clarify the nature of joint effusion (JE) on T2-weighted magnetic resonance images of the temporomandibular joint (TMJ) by analysis of the synovial fluid in the superior compartment of patients with internal derangement and osteoarthrosis.


METHODS
One hundred symptomatic TMJs (100 patients) with 65 internal derangements and 35 osteoarthroses were scanned by means of magnetic resonance imaging, and, the synovial fluid was sampled on the same day. The amount of JE was evaluated on a scale of 0 to 3. Grades 0 and 1 indicated absence of JE or a negligible amount of JE, respectively, and grades 2 and 3 indicated the presence of JE. Correlation was evaluated among the amount of JE and the concentrations of the total protein and interleukin-1beta(IL-1beta), IL-6, IL-8, and tumor necrosis factor-alpha in the synovial fluid.


RESULTS
Magnetic resonance imaging revealed the absence of JE in 40 joints (grade 0, 17 joints; grade 1, 23 joints) and the presence of JE in 60 joints (grade 2, 31 joints; grade 3, 29 joints). The joints with JE had, on average, significantly higher concentrations of total protein (1,675 microg vs 714 microg; P = .0001) and IL-6 (42.9 pg vs 10.6 pg; P = .009) than did the joints without JE. Furthermore, there were significant correlations between the JE grade and the concentrations of the total protein (P = .0001), IL-6 (P = .001), and IL-8 (P = .004). The detection ratio of cytokines among the presence-absence groups of JE showed a significant difference in tumor necrosis factor-alpha (68.3% vs 47.5%; P = .037) and IL-6 (86.7% vs 67.5%; P = .012). Conclusions. JE may contain the released products when there is pronounced synovitis. It is probably composed of high concentrations of total protein with inflammatory cytokines. Furthermore, IL-6 and IL-8 seem to have an important role in the pathogenesis of JE in TMJ disorders.
Segami
Natsuki
N
Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Uchinada, Japan. n-segami@kanazawa-med.ac.jp
Miyamaru
Masahisa
M
Nishimura
Masaaki
M
Suzuki
Toshikazu
T
Kaneyama
Keiseki
K
Murakami
Ken-Ichiro
K
D000293:Adolescent; D000328:Adult; D000368:Aged; D018771:Arthralgia / Q000145:classification; D016009:Chi-Square Distribution; D016207:Cytokines / Q000032:analysis*; D005260:Female; D006801:Humans; D007375:Interleukin-1 / Q000032:analysis; D015850:Interleukin-6 / Q000032:analysis; D016209:Interleukin-8 / Q000032:analysis; D004204:Joint Dislocations / Q000175:diagnosis* / Q000378:metabolism; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008335:Mandibular Condyle / Q000473:pathology; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis* / Q000378:metabolism; D010147:Pain Measurement; D011506:Proteins / Q000032:analysis*; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D018709:Statistics, Nonparametric; D013582:Synovial Fluid / Q000737:chemistry*; D013585:Synovitis / Q000175:diagnosis* / Q000378:metabolism / Q000503:physiopathology; D013704:Temporomandibular Joint / Q000473:pathology*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000378:metabolism / Q000503:physiopathology; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
D016207:Cytokines; D007375:Interleukin-1; D015850:Interleukin-6; D016209:Interleukin-8; D011506:Proteins; D014409:Tumor Necrosis Factor-alpha