[The dangers of Trauner's operation]

The technique described by Trauner for using retro-condylar cartilaginous implants is outlined, and the complications observed indicated. External or inferior luxation of the implant leads to recurrence of the deformity, whereas no inconvenience is caused by the opening of the joint. These pitfalls led to the use of a modified technique in which the cartilaginous implant is introduced into the supra-meniscal cavity of the temporo-mandibular joint.