Bilateral varus-valgus knee-stress roentgenograms were made in 208
patients with unilateral single tibial-plateau fracture. Martin's so-called
clear space was used to measure the laxity of the collateral ligaments and
statistical analysis showed no increased laxity in the possibility injured
ligaments. A vacuum phenomenon was produced in 36 per cent and ligament
calcification was noted in 16 per cent of the knees tested.