Ultrasound-Guided Intra-Articular Infiltration of Hyaluronic Acid, Lidocaine, and Methylprednisolone in Patients with Temporomandibular Disorders (TMD): A Preliminary Pilot Case Series

Background/Objectives: This preliminary pilot case series aims to evaluate the feasibility and temporal evolution of pain and function following an ultrasound-guided infiltration technique with hyaluronic acid and methylprednisolone in a specific patient population with Temporomandibular Disorders (TMD) characterized by MRI-confirmed retrodiscal tissue hyperemia. Given the absence of a control group, this study represents a preliminary exploration of a clinical approach utilizing individualized interocclusal devices during infiltration. Methods: Twenty-eight patients (16 females, 12 males) with TMD and MRI evidence of retrodiscal tissue hyperemia were enrolled in this prospective, uncontrolled study. A unique protocol was employed, utilizing individualized interocclusal devices to optimize joint space access during bilateral ultrasound-guided infiltration of a mixture containing low-molecular-weight hyaluronic acid, lidocaine, and methylprednisolone acetate. Pain intensity (VAS 0–100 mm) and associated symptoms (tinnitus, vertigo, headache, joint clicking) were assessed at baseline and at 30, 60, and 90 days’ follow-up. Results: A statistically significant temporal reduction in pain was observed at all follow-up points (p < 0.001), with the mean VAS score decreasing from 70.5 ± 11.4 mm at baseline to 43.0 ± 11.1 mm at 90 days. Joint clicking disappeared in 80% of patients immediately after treatment. Conclusions: The ultrasound-guided infiltration technique, combined with personalized interocclusal support, demonstrated preliminary feasibility and short-term temporal improvement in pain and joint clicking in this specific patient cohort. Due to the lack of a control group and the multimodal nature of the intervention, these findings should be considered preliminary and do not allow for causal inferences regarding the efficacy of individual components.