Direct infiltration of botulinum toxin into the pterygoid lateral muscle for repositioning of the disc during arthroscopy of the temporomandibular joint

Anterior disc displacement of the temporomandibular joint (TMJ) without reduction is a condition that is included in stage III of the Wilkes classification, and usually requires surgical treatment.1 Arthroscopy is a minimally-invasive procedure that can reposition the disc and fix it in place.2 However, before this can be done an initial myotomy of the upper belly of the lateral pterygoid muscle is necessary to free the disc,3 and is usually done with electrocautery, radiofrequency, or laser.

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