Today, in the event of a knee sprain with suspected cruciate ligament damage, magnetic resonance imaging (MRI) is generally prescribed to confirm or refute the diagnosis and assess its severity. Once the MRI has been performed, the patient's care is organized by the doctor of his or her choice, depending on the diagnosis.

Previous studies have shown that Automated Dynamic Laximetry (ADL) performs identically to MRI in helping to diagnose a knee sprain as a complementary examination and in assessing its severity. Performing LDA at the start of the patient's care pathway, i.e. immediately after the emergency room visit for a suspected severe sprain, could bring significant benefits by shortening the diagnostic confirmation time and consequently the immobilization period, and by reducing the cost of care compared with the conventional MRI-based care pathway. The new LDA-based care pathway would enable MRI to be reserved for very specific cases, such as the scheduling of surgery for suspected meniscus or osteochondral lesions, as currently recommended by the HAS.

Inclusion Criteria:

• Patient admitted to an emergency department participating in the study
• Age ≥ 18 years
• Consulted following knee trauma and whose clinical examination leads to the suspicion of a partial or complete ACL lesion without bone fracture (supporting radiograph).
• Signed consent to participate in the study
• Affiliated to a social security scheme

Exclusion Criteria:

• Contraindication to MRI (pacemaker fitted before 2010) or LDA;
• Indication for emergency or semi-emergency trauma surgery (within 3 weeks: suspected unstable meniscal lesion, fracture, etc.).
• Impossible follow-up or patient's refusal of follow-up in the investigating center's sports medicine department;
• Poor understanding of the French language
• Pregnant (known or suspected pregnancy), breast-feeding or parturient woman;
• Person deprived of liberty by judicial or administrative decision;
• Person under compulsory psychiatric care;
• Person subject to a legal protection measure
• Person unable to give consent

Data will be shared upon reasonable request. Only de-identified data will be shared. Any data collected during the study may be shared. The protocol will be shared initially. Other documents may be shared at a later date upon request (e.g., the CRF to allow a collaborator to select the data they wish to access). The recipients of the data will be researchers. The data will be available for any purpose deemed relevant by the study investigator, based on a protocol provided by the requester, after verification of the obtaining of regulatory approvals, including the favorable opinion of an ethics committee.

The data will be shared after signing a negotiated data transfer agreement ( data access agreement), for the duration specified in the agreement.

The data will be made available via secure transfer (sharing platform approved by the university hospital: BlueFiles or Oodrive).