Surgical Treatment of Temporomandibular Joint Ankylosis: our experience with 36 cases

Aim: To evaluate and compare outcomes of patients with temporomandibular joint ankylosis (TMJA) treated by gap arthroplasty, costochondral graft, and total alloplastic joint reconstruction. Methodology: A retrospective cohort study reviewed and analyzed data from patients with TMJA from January 1, 2009 to December 31, 2019, at the Maxillofacial and Oral Surgery Department, University of the Witwatersrand. Patients with TMJA were treated either with gap arthroplasty, costochondral graft, or total alloplastic joint reconstruction. Data collected included age, sex, etiology of ankylosis, sides involved, preoperation and postoperation mouth opening (MO), treatment type, complications, and revision surgery. Patients were followed up for at least 18 months after the surgical procedure. Comparison of means across the treatment groups was analyzed using paired t tests or analysis of variance test. A P value of less than 0.05 was considered statistically significant. Results: The study sample comprised of 36 patients bilateral, n=22; unilateral, n=14 (21 male, 15 female). Trauma was the most common etiology (n=27, 75%), followed by chronic infections (n=4, 11.11%) and juvenile arthritis (n=3, 8.3%). A paired t test revealed no statistical significance between treatment modality and postoperative MO and complications over 18 months ( P =0.5316 and P =0.426, respectively). The mean MO increased from 4 to 28 mm. Reankylosis was the most common complication (n=5). Conclusions: All 3 treatment options yield acceptable outcomes in patients with TMJA. Irrespective of surgical technique, early postoperative exercises, active physiotherapy, and follow-up are imperative for successful rehabilitation and prevention of reankylosis.