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Revise for your FRCS Trauma & Orthopedic exam with us430+ questions Get the best start possible with hundreds of EMI and SBA practice questions, mapped to the Royal College of Surgeons’ ISB Section 1 curriculum.Revise with quality questions and detailed explanationsDemo QuestionWith respect to ankle fractures, which of the following is correct? 3 mm of talar shift leads to a decrease in tibiotalar contact by 50% A medial clear space > 4 mm is indicative of a deltoid ligament injury Concomitant osteochondral fractures of the talar dome are uncommon Syndesmosis injuries can only occur with a Weber C type fracture of the lateral malleolus The majority of fractures are due to a pronation external rotation injury Key Learning Point Normally the medial clear space (between talus and medial malleolus) should be less than 4 mm and when the medial space is > than 4 mm, then lateral shift of talus is present. Explanation The majority of fractures occur due to a supination- external rotation injury. Syndesmosis injuries can occur with low as well as high fibula fractures. Osteochondral defects can occur in up to 40% of ankle fractures in some series. Normally the medial clear space (between talus and medial malleolus) should be less than 4 mm and when the medial space is > than 4 mm, then lateral shift of talus is present. 1mm of talar shift decreases tibiotalar contact by 50%.
