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3D sequence MRI in the assessment of meniscofemoral and ligament lesions of the knee. MA.Chaabouni,A.Daghfous , A.Ben Othman,L.Rezgui Marhoul. Radiology departement Trauma center, Tunisia. MK9. Magnetic resonance imaging (MRI) is sensitive and specific
Trauma center, Tunisia
in the diagnosis of internal derangements of the knee .
widelyused to evaluate ligaments, tendons, and fibrocartilage
owing to its favorable contrast and signal-to-noise ratio .
imaging time by allowing multiplanar reformations.INTRODUCTION
Our objective is to determinewhether 3D sequences canimprove the diagnostic performance of a routine MR protocol for detectingmeniscal and ligament lesion of the knee.
Retrospectivestudy : 56 patients whohadknee MRI 1,5 Tesla for suspectedmeniscal and/or ligament lesions.
ligament lesions.MATERIALS AND METHODS
well with 2D and 3D sequences.
Fig.1: A 34 -year-oldfemale patient with PCL tear ( ) of the right knee Sagittal images obtainedwith 2D FSE (a) and 3D sequences (b) at 1,5T
Fig.2:A 38-year-old male patient with a complex tear of the medialmeniscusposteriorhorn. ( )Sagittal images obtainedwith2D (a) and 3D sequences (b) at 1,5 T.Axial images obtainedwith 2D (c) and 3D FSE sequences (d) at 1,5T.
Fig.3:A 45-year-old male patient with a longitudinal tear of the medialmeniscusposterior
Sagittal and axial images obtainedwith2D (a,c) and 3D FSE sequences (b,d )at 1,5T.
The tearis not visualised on the axial 2D FSE sequence but wellvisualised on 3D
Fig.4: A 21 -year-oldfemale patient with a seal cove tear of the medialmeniscusposteriorhorn ( )Coronal and sagittal images obtainedwith2D (a,c) and 3D FSE sequences (b,d) at 1,5T.
Fig.5: A 27-year-old male patient with ACL tear of the leftknee.Sagittal images obtainedwith 2D (a) and 3D FSE sequences (b) at 1,5T.
The described 3D isotropicfast SE intermediateweighted MR sequenceenablesthin-section data acquisition without intersection gaps and multiplanar image reformation in standard and nonstandardplanes that may be helpful for the
detection and analysis of complex structures.
Duc et al (28) reported 3D isovoxel true fast Imaging with steady-state precession to have sensitivities, specificities, and accuracies of 80%, 95%, and 90%,respectively, for the diagnosis of ACL tears; 100%, 82% and 90%, respectively, for the diagnosis of MM tears; and 83%, 83%, and 83%, respectively for the diagnosis of LM tears.
subjectively high-quality images with comparable anatomicdetail.
All meniscal and ligament tears was shown equally well with both techniques.
The thinner slice thickness and resultant dimunition in volume-averaging may have been responsible for this observation, especially in the case of small tears.
within the meniscus, it often became more difficult to
determine whether the abnormality communicated with the
meniscal surface, thus differentiating internal degeneration
echo imaging implementations.