{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T19:59:47Z","timestamp":1790539187654,"version":"4.1.0"},"reference-count":40,"publisher":"BMJ","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Sports Med"],"published-print":{"date-parts":[[2007,7]]},"abstract":"<jats:p><jats:bold>Background:<\/jats:bold>Chronic ankle instability (CAI) is a common orthopaedic entity in sport. Although other risk factors have been studied extensively, little is known about how it is influenced by the osseous joint configuration.<\/jats:p><jats:p><jats:bold>Aim:<\/jats:bold>To study the effect of osseous ankle configuration on CAI.<\/jats:p><jats:p><jats:bold>Design:<\/jats:bold>Case\u2013control study, level III.<\/jats:p><jats:p><jats:bold>Setting:<\/jats:bold>Radiological examination with measurement of lateral<jats:italic>x<\/jats:italic>rays by an independent radiologist using a digital DICOM\/PACS system.<\/jats:p><jats:p><jats:bold>Patients:<\/jats:bold>A group of 52 patients who had had at least three recurrent sprains was compared with an age-matched and sex-matched control group of 52 healthy subjects.<\/jats:p><jats:p><jats:bold>Main outcome measures:<\/jats:bold>The radius of the talar surface, the tibial coverage of the talus (tibiotalar sector) and the height of the talar body were measured.<\/jats:p><jats:p><jats:bold>Results:<\/jats:bold>The talar radius was found to be larger in patients with CAI (21.2 (2.4) mm) than in controls (17.7 (1.9) mm; p&lt;0.001, power &gt;95%). The tibiotalar sector, representing the tibial coverage of the talus, was smaller in patients with CAI (80\u00b0 (5.1\u00b0)) than in controls (88.4\u00b0 (7.2\u00b0); p&lt;0.001, power &gt;95%). No significant difference was observed in the height of the talar body between patients with CAI (28.8 (2.6) mm) and controls (27.5 (4.0) mm; p\u200a=\u200a0.055).<\/jats:p><jats:p><jats:bold>Conclusion:<\/jats:bold>CAI is associated with an unstable osseous joint configuration characterised by a larger radius of the talus and a smaller tibiotalar sector. 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