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.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
151
Dynamic knee laxity measurement coupled to MRI for the diagnosis of ACL tear
Hospices Civils de Lyon - Hôpital Edouard Herriot Pavillon B Radiologie
Lyon, France
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.
Time frame: 1 year after the baseline MRI-scan
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.
Time frame: 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
Time frame: 1 year after the baseline MRI-scan
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