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Localisation and injection of the sinus tarsi can be challenging, particularly for the less experienced musculoskeletal sonographer/practitioner. The inferior extensor retinaculum arises from the sinus tarsi in the form of three roots (medial, intermediate and lateral) which are collectively termed the frondiform ligament. This is readily identified on ultrasound and can be used as a reference point to aid the safe delivery of injectate material into the sinus tarsi. This article describes the technique and its anatomical basis.

A 4-year-old girl with no past medical history presented with a non-traumatic and non-tender firm lump on the dorsum of her right ring finger (Fig. 1). Follow-up imaging over the subsequent 3 months demonstrated an increase in size of the lesion (Fig. 2).The diagnosis can be found at doi: https://doi

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