Actually, there are several laximeters for measuring anterior tibial translational in case of anterior cruciate ligament rupture. The most commonly used are telos, KT-1000, GnrB and Rolimeter. Results of these instrumented tests, which expressed in differential (millimeters values), have a bad correlation between them and so are not comparable in current literature. The aim of this study was to compare results of these tests and establish a ratio (pathologic knee laxity/ healthy knee laxity) to reduce differences between each instrumented test.

Inclusion Criteria:

• Obtaining a written informed consent of the patient,
• Affiliated with a Medicare (or rightful beneficiary),
• Disponibility of the patient,
• Patients ≥ 18 ans,
• Anterior cruciate ligament rupture concerned only one knee of the patient.

Exclusion Criteria:

• Patient is in the exclusion period for another study,
• Patient is under judicial protection, guardianship, or curators,
• Eligible patients who are refused to sign consent,
• It is impossible to give clear informations to the patient,
• Pregnant women,
• Nursing mother,
• Patient which has been already operate of the other knee,
• Patient present ligament lesions associated.