[Magnetic resonance imaging of the knee. Preliminary study of non-neoplastic osteoarticular pathology]
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R Pinto1, V Monteleone, L Romano
1II Servizio di Radiologia, Ospedale A. Cardarelli, Napoli.
Abstract:
Magnetic Resonance Imaging (MRI) has been applied to musculoskeletal pathoanatomy and has proved to be useful in the detection and characterization of knee pathology. Thirty-two acutely injured knees and 8 normal knees were examined. The images were obtained in the Diagnostic Centre RMRC of Naples on a 0.5 T superconductive magnet system, using a surface coil and a spin-echo pulse sequence (SE 600/28 ms). The examined limb was immobilized and bent at 8-10 degrees, extrarotated for the examination of the anterior cruciate ligament (ACL) only. Images were obtained on a 256 x 256 matrix and had a 2 or 4-mm thickness. MRI clearly showed all the anatomical structures. The anterior and posterior cruciate ligaments (ACL and PCL) and the patellar ligament were shown by sagittal SE images through the intercondylar notch; the tibial and fibular collateral ligaments (TCL and FCL) were evaluated on coronal SE images; the articular capsula and menisci on axial transverse SE images. Objective criteria for ACL and PCL tears were: lack of continuity of the signal and change in signal intensity; in meniscal pathology, menisci with small linear regions of increased signal or with grossly truncated shape were interpreted as tears. Preliminary results of this study indicate that MRI together with clinical evaluation may be an useful non-invasive procedure in the assessment of acute injuries of the knee.
Insights
Magnetic Resonance Imaging (MRI) is effective for diagnosing knee injuries. This study shows MRI accurately detects tears in ligaments and menisci, aiding in the assessment of acute knee pathology.
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging
Background:
- Musculoskeletal pathoanatomy assessment.
- Knee pathology detection and characterization.
- Established utility of MRI in musculoskeletal imaging.
Purpose of the Study:
- Evaluate the efficacy of MRI in diagnosing acute knee injuries.
- Characterize knee pathology using MRI.
- Assess the role of MRI in conjunction with clinical evaluation.
Main Methods:
- Utilized a 0.5 T superconductive magnet system with a surface coil and spin-echo pulse sequence.
- Examined 32 acutely injured knees and 8 normal knees.
- Acquired images with 256x256 matrix and 2-4 mm thickness, employing specific imaging planes for different structures.
Main Results:
- MRI clearly visualized all anatomical structures, including anterior and posterior cruciate ligaments (ACL/PCL), patellar ligament, collateral ligaments, menisci, and articular capsule.
- Objective criteria for ligament tears included signal discontinuity and intensity changes.
- Meniscal tears were identified by increased signal regions or truncated shapes.
Conclusions:
- Preliminary findings suggest MRI is a useful non-invasive tool for assessing acute knee injuries.
- Combined MRI and clinical evaluation enhance diagnostic accuracy for knee pathology.
- MRI demonstrates significant potential in the non-invasive assessment of acute knee trauma.