One of the common causes for development of dentofacial deformities and also for relapse following orthognathic surgery involves condylar resorption. Most often the pathological process creating condylar resorption (in either an active or remission state) is present prior to the orthognathic surgery, is unrecognized or untreated, resulting in predictable relapse post surgery. There are several common conditions that cause condylar resorption that can adversely affect orthognathic surgery treatment outcomes. These include: Displaced articular discs; adolescent internal condylar resorption (AICR); reactive arthritis; and connective tissue and autoimmune diseases. Identifying these conditions prior to performing orthognathic surgery and following the appropriate treatment protocol can result in predictably good outcomes. This program will demonstrate the clinical presentation and diagnoses of each of these specific TMJ pathologies; aetiologies and pathological processes; treatment protocols to provide optimal functional and aesthetic results as well as eliminate or reduce pain; and long term treatment outcomes. The significant value of the MRI for TMJ diagnosis and treatment planning will be included. Case presentations will illustrate the various pathologic processes and outcomes following specific treatment protocols.