A Retrospective Study of Patient Outcomes After Temporomandibular Joint Replacement With Alloplastic Total Joint Prosthesis at Massachusetts General Hospital.

Purpose: Disorders of the temporomandibular joint (TMJ) occur frequently, with a prevalence of 15 to 18%. Total joint replacement (TJR) surgery is indicated for severe joint damage associated with impaired function, pain, or occlusal change for which other treatments have been unsuccessful. The aim of this study was to assess changes in pain and range of motion (ROM), as well as postoperative complications and comorbidities, in patients receiving TJR surgery at Massachusetts General Hospital (MGH).

Patients And Methods: This study is a retrospective review that describes the clinical variables in patients after alloplastic TMJ reconstruction performed at MGH from 2000 to 2015. Clinical variables included primary diagnosis; number of previous surgical procedures; comorbidities; preoperative and postoperative pain; preoperative, intraoperative, and postoperative ROM; and complications.

Results: Data were obtained from 95 patients undergoing a total of 108 surgical procedures, with an average follow-up period of 4.48 ± 3.38 years. The most common primary indications for TJR were ankylosis (44%) and inflammatory disease (23%). The maximum interincisal opening improved by a mean of 7.7 ± 10.27 mm, and pain decreased by a mean of 1.5 ± 3.29 points on a visual analog scale. Transient facial nerve palsy (25%) was the most common postoperative complication; however, long-term complications were rare. The most frequent comorbidities were psychiatric disorders (56%) and gastrointestinal disease (46%). Psychiatric patients had similar preoperative pain scores (6.0 ± 2.90) but significantly higher postoperative pain scores (4.7 ± 2.58) compared with nonpsychiatric patients. Twenty-eight percent of patients had prior failed TMJ implant materials, specifically Proplast-Teflon (Vitek, Houston, TX). These patients were significantly older (50.4 ± 8.26 years) and had smaller preoperative ROM (21.7 ± 8.85 mm) and smaller postoperative ROM (28.3 ± 9.59 mm).

Conclusions: Patients showed a statistically significant (P < .01) increase in ROM and reduction in pain. TJR is an effective treatment option in patients with limited mouth opening or severe pain.