TMJ arthrography
Dental Procedures
≈ ¥300-800
(≈ $40-110)
30 min
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Description
Estimated cost for TMJ arthrography at general public hospitals in China is about ¥210-640, and at Grade 3A hospitals about ¥300-800, varying by hospital tier and region.
Main Uses
TMJ arthrography is primarily used to evaluate internal derangements of the temporomandibular joint—especially disc displacement (with or without reduction), perforations, adhesions, and capsular abnormalities. It is indicated when MRI is contraindicated or unavailable, or when dynamic functional assessment (e.g., during jaw opening/closing under fluoroscopy) is required. Common clinical scenarios include persistent TMJ pain, crepitus, locking, limited mouth opening, or failed conservative management where precise anatomical and functional joint pathology must be delineated prior to surgical planning (e.g., arthroscopy or disc repositioning).
Normal Range
No quantitative 'normal range' values exist for temporomandibular joint (TMJ) arthrography, as it is an imaging-based diagnostic procedure—not a laboratory test measuring numerical biomarkers. Normal findings include: smooth, continuous contrast-filled joint capsule; uniform contrast distribution in the superior and inferior joint spaces; no evidence of contrast leakage, filling defects, or abnormal communication between compartments; normal disc position (anterior band over condyle in closed mouth, intermediate zone over condyle in open mouth); no contrast extravasation into surrounding soft tissues or pterygoid muscles.
Low Values - Possible Causes
Low contrast filling or poor visualization is not quantified but may result from: 1) Inadequate contrast injection volume or technique (e.g., needle misplacement), 2) Severe joint fibrosis or adhesions limiting contrast spread, 3) Acute inflammatory swelling compressing joint space and impeding contrast entry, 4) Prior surgical intervention (e.g., disc repair or eminectomy) altering anatomy and contrast dynamics, 5) Technical failure (e.g., contrast reflux, catheter occlusion, or premature needle withdrawal).
High Values - Possible Causes
Excessive or abnormal contrast distribution—though not measured numerically—may indicate: 1) Perforation or tear of the articular disc allowing contrast to cross between superior and inferior joint compartments, 2) Capsular laxity or rupture leading to contrast extravasation into pericapsular tissues (e.g., lateral pterygoid muscle or parapharyngeal space), 3) Chronic degenerative joint disease with capsular attenuation and abnormal contrast seepage, 4) Post-traumatic joint disruption (e.g., condylar fracture with capsular breach), 5) Iatrogenic complications such as inadvertent intra-arterial injection (rare but serious, causing vascular blush or neurologic symptoms).