Objective: This article presents the use of dermis fat grafts from the thigh as an alternative site for treating TMJ ankylosis. It highlights the advantages of using grafts from the lateral thigh compared to other harvesting sites. Materials and Methods: Ten patients with TMJ ankylosis underwent surgical release and received dermis-fat grafts from the lateral thigh. Patients were monitored for at least 6 months. Evaluation criteria included maximum inter-incisal opening (MIO), pain during physiotherapy, scar perception at the donor site, complications, and ankylosis recurrence. Results: All 10 patients had unilateral TMJ ankylosis. The initial mean inter-incisal opening was 5.0 mm, significantly improving to 35.7 mm after surgery. No re-ankylosis occurred during the one-year follow-up. Post-operative was associated with reduced pain, and patients showed improved compliance (as reflected by mean VAS score: 4). Two patients had hypertrophic scars, managed with steroid injections. Donor site scars on the lateral thigh were inconspicuous due to clothing, with no impact on daily life. Conclusion: Utilizing dermis-fat grafts from the lateral thigh in TMJ ankylosis surgery yields comparable mouth-opening outcomes to other graft sites. Additional benefits include greater fat quantity for better cushioning, minimal scar visibility, and improved patient acceptance.