The intra-articular injection is considered the first line of minimally invasive treatment in temporomandibular joint with internal derangement (TMJ-ID) patients who do not respond to conservative treatment. The single-needle technique arthrocentesis has emerged to add reliability, convenience, ease the performance of the procedure, and eliminate the need for multiple punctures the Aim of this study is to assess clinical applicability and therapeutic outcomes of computer guided single needle arthrocentesis with platelet rich plasma using Shepard's cannula, in comparison with conventional free-hand technique, in the management of disc displacement with reduction of the TMJ.