Post-traumatic sinus tarsi syndrome. An anatomical and radiological study.

Four cases of sinus tarsi syndrome are presented. They were studied by means of arthrography of the posterior subtalar joint and histological examination of sinus tarsi soft tissue. The obliteration of synovial recesses on posterior subtalar joint arthrography can be explained by synovial hyperplasia and by cicatricial remodelling of ligament tissue.