TMJ surgeries are not always successful. Many potential pitfalls can occur during any phase of the treatment and can lead to complications, less than desirable results, and short- or long-term failures. Unsatisfactory results can occur for multiple reasons, including misdiagnosis of the original pathologic condition, incorrect selection of surgical technique, technical failures, complications, systemic disease, and unrealistic expectations. This article focuses on the reoperation of the TMJ primarily in cases of internal derangement and discusses TMJ arthrocentesis, arthroscopy, modified condylotomy, and open joint procedures.