Dynamic Knee Laxity Measurement Coupled to MRI in Cases of Suspected Partial Anterior Cruciate Ligament Tear

Study Overview
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Brief Summary
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Anterior cruciate ligament (ACL) tear is frequent, but the diagnosis of partial tears is difficult. Standard MRI may be used but is of limited diagnostic value. The present study aimed to evaluate the diagnostic interest of dynamic knee laxity measurement coupled to MRI for the diagnosis of ACL tear.

Official Title
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Dynamic Knee Laxity Measurement Coupled to MRI in Cases of Suspected Partial Anterior Cruciate Ligament Tear

Conditions
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Anterior Cruciate Ligament Tear

Intervention / Treatment
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* Device: LaxIRM


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: knee injury requiring MRI examination accepting to participate covered by a health care insurance system Exclusion Criteria: MRI contraindication pregnancy patient included in another study potentially affecting the results protected patients

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: laxIRM<br>Patients will have dynamic knee laxity measurement coupled to MRI for the diagnosis of ACL tear | Device: LaxIRM<br>* Dynamic knee laxity measurement coupled to MRI for the diagnosis of ACL tear<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Anterior tibial translation (ATT) measurement | Time Frame : 1 year after the baseline MRI-scan a follow-up MRI is performed if the patient did not had surgery. ATT is calculated as the difference between the distance from the tangent to the condyle to the tangent to the posterior aspect of the tibial plateau in the stress position and in resting conditions. ATT is measured for the medial and the lateral compartment respectively and the final ATT is the average of medial and lateral ATT. | 1 year after the baseline MRI-scan | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Degree of laxity | 1 year after the baseline MRI-scan a follow-up MRI is performed if the patient did not had surgery. Laxity of the torn ligament is defined using a visual scale with the following grading : 0 : No laxity. Grade 1: moderate laxity. Grade 2: severe laxity. | 1 year after the baseline MRI-scan | 
| Femorotibial rotation (FTR) value | 1 year after the baseline MRI-scan a follow-up MRI is performed if the patient did not had surgery. FTR= arc tan ((ATT lateral-ATT medial)/(slice thickness*number of sagittal slices))*180/π | 1 year after the baseline MRI-scan | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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dynamic knee laxity measurement, laxi-MRI, partial anterior cruciate ligament tear