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Tibial translation after anterior cruciate ligament rupture. Two radiological tests compared



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Abstract

Anterior tibial translation was measured in both knees using the radiological Lachman test and the lateral monopodal stance tests in 281 patients with unilateral anterior cruciate ligament (ACL) rupture. Measurements of translation in the medial compartment were more useful than those in the lateral compartment. Measurement of anterior tibial translation in the medial compartment using the radiological Lachman test showed ACL rupture in 92% of cases compared with 70% for the lateral monopodal stance test. In normal and in ACL-ruptured knees the monopodal stance test showed that every 10 degrees increase in posterior inclination of the tibial plateau was associated with a 6 mm increase in anterior tibial translation; the radiological Lachman test showed a 3 mm increase for every 10 degrees increase in tibial slope.

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