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  • Title: Likelihood ratio methodology to identify predictors of treatment outcome in temporomandibular joint arthralgia patients.
    Author: Emshoff R, Rudisch A.
    Journal: Oral Surg Oral Med Oral Pathol Oral Radiol Endod; 2008 Oct; 106(4):525-33. PubMed ID: 18657453.
    Abstract:
    OBJECTIVES: The purpose of this prospective, cohort study of patients with temporomandibular joint (TMJ) pain was to develop rules to predict treatment outcome related to occlusal stabilization splints. STUDY DESIGN: The study comprised 119 patients with a unilateral Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) axis I diagnosis of arthralgia. Visual analog scale (VAS) pain level of function was assessed before stabilization splint therapy and compared with the respective 2-month and 6-month follow-up findings. Magnetic resonance (MR) images were obtained immediately before treatment to establish the presence or absence of disk displacement, osteoarthrosis, effusion, and bone marrow edema. Treatment outcome (success or failure) was categorized based on changes in the VAS pain level after 6 months. RESULTS: Sixty-five (55%) subjects were categorized as treatment success, 17 (14%) as treatment failures, and 37 (31%) as somewhat improved. After using univariate analyis to determine the association between potential clinical and MR imaging predictor variables and treatment outcome status, preliminary prediction rules were developed for prediction of success (positive LR, 10.8; 95% confidence interval [CI], 0.6-188.1) and failure (negative LR, 0.05; CI, 0.0-0.8). The most important variables were time since pain onset, basic VAS pain level, change in VAS level at 2-month follow-up, and clinical diagnoses of disk displacement with and without reduction. CONCLUSION: Outcome following use of occlusal stabilization splints may be predicted from variables collected from self-report and physical examination. Predictive modeling may provide clinicians with the opportunity to identify "at-risk" patients early and initiate alternative treatment approaches.
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