Aims and objective: The present study was done to evaluate the efficacy of interpositional arthroplasty with temporalis muscle and fascia (myofascia) flap in preventing the re-ankylosis, to evaluate the growth of mandible, and to assess Al-Kayat and Bramley’s incision for its versatility in allowing muscle transfer and excellent exposure of the joint. Materials and Methods: Fifteen patients with ankylosis were treated with interpositional arthroplasty with temporalis myofascia flap. Maximum Interincisal Opening (MIO) was measured at different periods, i.e. preoperative, intraoperative, immediate post operative, 1 month post-operative, 6 month post-operative, 1 year post-operative. Pain was measured using Visual analogue scales in closed mouth position (spontaneously) & on mouth opening. Six cephalometric points were taken for evaluating the mandibular growth. Results: A statistically significant difference of 30.73 mm (p<0.001) was obtained between pre-operative and post-operative interincisal opening after a period of one year follow up. The pain score at different periods of time revealed that the pain incidence significantly reduced to almost zero post-operatively (p<0.5 for closed mouth, p<0.01 for open mouth).