A Symptomatic Swollen Ankle in an 8-year-old Male Child – A Rare Case Report of Dysplasia Epiphysealis Hemimelica

INTRODUCTION: Trevor’s disease also known as Dysplasia Epiphysealis Hemimelica is an uncommon epiphyseal affliction of childhood, developmental in nature with unknown etiology. It is an osteochondral lesion arising from the epiphyses and progressively increasing in size until skeletal maturity is reached. Surgical management is not advisable in cases, where there is absence of articular symptoms and mass evolution is present, until there is achievement of skeletal maturity. Pain, joint deformity, and impingement mandate surgical intervention and the result is good in cases, where the mass is juxta articular or extra-articular in location. CASE REPORT: We report such a rare case of an 8-year-old male child who presented to us with a hard swelling over ankle with restricted movement and was promptly treated by us with medial malleolus osteotomy and surgical excision of the tumorous mass with subsequent malleolar screw fixation after establishing a diagnosis of osteochondroma of talus. CONCLUSION: Making a correct diagnosis with imaging and confirmation by histology is necessary, after which careful surgical planning should be carried out in cases, where bony masses are causing pain, ankle mobility hindrance, and impingement with footwear hampering daily activities, this helps prevent recurrence and its further complications.