Assessment of concentric needle technique for the management of temporomandibular joint internal derangement in comparsion with the double needle technique. Materials and methods: This study was conducted on twenty patients with clinical and radiological diagnosis of TMJ internal derangement(anterior disc displacement with reduction).The patients in the study divided into two equal groups.Magnetic resonance imaging (MRI) was performed in both groups preopeartively.Control group included ten patients that were subjected to conventional double needle arthrocentesis,The study group included ten patients that were subjected to arthrocentesis by concentric needle cannula technique. Patient's follow up will be preoperatively and postoperatively following the procedure.