Ultrasound-guided Versus Arthroscopic Guided PRF Injection for TMJ Disc Displacement.

Inclusion Criteria: * Patients aged 18-60 years. * Clinically and radiographically diagnosed temporomandibular joint disc displacemet with reduction. * Presence of TMJ pain exacerbated by mandibular movement. * Limited mandibular function and/or reduced maximum mouth opening. * Symptoms persisting for at least 3 months. * Failure of conservative treatment (e.g. occlusal splint, physiotherapy, NSAIDs). -Ability to understand the study protocol and provide informed consent. Exclusion Criteria: * Previous TMJ surgery or arthroscopic intervention. * Intra-articular injection in the TMJ within the last 6 months. * Systemic inflammatory or autoimmune joint diseases. * Coagulation disorders or current anticoagulant therapy. * Active local infection at the injection site. * Pregnancy or lactation. * Severe degenerative joint disease (advanced osteoarthritis). * Known allergy or contraindication to ( PRF) preparation.