[Measurement of anteroposterior knee stability with Genucom and Stryker equipments. A comparative in vivo study of a normal subject].

One hundred normal individuals were examined with both Stryker and Genucom equipment. The median antero-posterior instabilities were 9.0 mm in the right knee and 8.3 mm in the left knee measured with the Genucom apparatus. The Stryker laxity tester revealed median antero-posterior instabilities of 5.2 and 5.1 mm for the right and left knees, respectively. The variation between the right and left knee was considerable as measured by the Genucom knee-analysis method (p = 0.008) while no significant difference was observed between the right and left knees employing the Stryker laxity tester (p = 0.53). No differences in antero-posterior instability were found between men and women. Correlations were observed between measurements made on the individual participants between the two methods of measurement but direct comparisons can only be undertaken employing a correlation factor.