A 20-year-old patient complains about inability to move with his lower jaw, speech difficulty and problems during eating. He associates his condition with a trauma he got when biting on apple. Examination revealed half-open mouth, open bite due to the solitary contacts of distal tubercles of the last molars, salivation, indistinct speech. Articular heads of mandible can be felt anterior to both tragi. What is the most likely diagnosis?