Objective: Chronic ankle instability (CAI) is a frequent sport orthopaedic entity. Although other risk factors have been studied extensively, little is known how it is influenced by the osseous joint configuration.
Design: Case control study, Level III.
Setting: Radiological examination with measurement of lateral X-rays by one independent radiologist using a digital DICOM/PACS system.
Patients: A group of 52 patients who suffered from at least three recurrent sprains was compared with a gender- and sex-matched control group of 52 healthy subjects.
Main outcome measurements: The radius of the talar surface, the tibial coverage of the talus (tibio- talar sector) and the height of talar body were measured.
Results: The talar radius was found to be larger in patients with CAI (21.2 ±2.4mm) than in patients of the control group (17.7 ±1.9mm; P<0.0001, Power >95%). The tibio-talar sector, representing the tibial coverage of the talus, was smaller in patients with CAI (80° ±5.1°) than in patients of the control group (88.4° ±7.2°; P<0.0001, Power >95%). There was no significant difference in the height of the talar body between patients with CAI (28.8 ±2.6mm) and healthy subjects (27.5 ±4.0mm; P=0.055).
Conclusion: CAI is associated with an unstable osseous joint configuration characterized by a larger radius of the talus and a smaller tibio-talar sector. There is evidence that a higher talus might also play a certain role, particularly in females.
Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.