Excrescent lesion: A diagnosis of lateral talar exostosis in chronically symptomatic sprained ankles

The excrescent lesion is a symptomatic anterolateral exostosis at the inser tion of the anterior talofibular ligament. It is found in patients with chr onic ankle pain after inversion injuries. It is most reliably diagnosed by computed tomography scan, but physical examination and oblique radiographs are suggestive in most cases, A technique for surgical excision and, in som e cases, repair of the anterior talofibular ligament is described. Five patients having a history of inversion sprains of the ankle, without s ignificant symptomatic improvement for a mean of 21 months after the injury , were evaluated. None had significant instability in the ankle or subtalar joints, clinically or with stress radiographs. The diagnosis of excrescent lesion was confirmed with computed tomography scan in all five patients. E ach underwent excision of the exostosis, Removal of the exostosis produced laxity of the anterior talofibular ligament in four of the patients and req uired an additional modified Brostrom procedure to tighten the anterior tal ofibular ligament. Clinical results were evaluated at a mean of 33 months postoperatively, usi ng the Ankle-Hindfoot scale from the American Orthopaedic Foot and Ankle So ciety. The three patients without pending claims for Workers' Compensation or related litigation all had excellent results (mean score, 93 points). Tw o patients with active legal claims had fair and poor results (mean score, 53 points).