Focuses on a prospective study conducted on subjects who were examined with five arthrometers. Subjects included 50 people with normal knees and 50 patients with chronic unilateral disruption of the anterior cruciate ligament. Use of the ME Dmetric KT-1000, the Stryker Knee Laxity Tester, the Acufex Knee Signature System, the Dyonics Dynamic Cruciate Tester and the Genucom Knee Analysis System; Study methods and results.