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[Magnetic resonance tomography--a possibility for non-invasive meniscus diagnosis. 1. Experimentally produced
Abstract:
Meniscus tears were experimentally produced by surgery in 5 pigs. They were identified via MR tomography with the selected routine sequence (SE: TR 1600, TE 22/80 msec, SD 3 mm) independent of position, orientation and severity. The best imaging was obtained between the 2nd and 8th weeks after the operation in the sagittal plane. Subsequently the contrast and with it simultaneously the delineation between intact fibrous cartilage and rupture cleft decreased; this could be observed in sequences weighted according to proton density and T2 in different degrees of intensity. Parallel to this a trial to induce degeneration in the meniscus tissue resulted 8 weeks after the operation in central, signal-intensive zones in the menisci. No success was achieved in trying to improve imaging of the pathological changes by means of intraarticular injections of Gd-DTPA; this was tried out at various points of time. Besides enabling the imaging of lesions of the fibrous cartilage as a matter of principle, MR tomography can also give limited information on the age of a meniscus tear.
Insights
Magnetic resonance (MR) tomography effectively images experimentally induced meniscus tears in pigs. Optimal imaging occurs weeks post-surgery, with limited ability to determine tear age.
Area of Science:
- Orthopedics
- Radiology
- Veterinary Medicine
Background:
- Meniscus tears are common knee injuries requiring accurate diagnosis.
- Magnetic resonance (MR) tomography is a key imaging modality for musculoskeletal conditions.
Purpose of the Study:
- To evaluate the efficacy of MR tomography for detecting experimentally induced meniscus tears in pigs.
- To determine the optimal imaging parameters and timing for visualizing meniscus tears.
- To assess the potential of MR tomography in characterizing tear age and degeneration.
Main Methods:
- Experimental induction of meniscus tears in 5 pigs via surgery.
- Utilized a specific MR tomography sequence (SE: TR 1600, TE 22/80 msec, SD 3 mm) for imaging.
- Evaluated imaging quality at various time points post-operation and assessed the impact of induced degeneration and contrast agents.
Main Results:
- MR tomography successfully identified experimentally induced meniscus tears regardless of position, orientation, or severity.
- Optimal imaging visualization was achieved between 2 and 8 weeks post-surgery, particularly in the sagittal plane.
- Image contrast and delineation of tears decreased over time, especially in proton density and T2-weighted sequences.
- Induced degeneration resulted in signal-intensive zones within menisci by 8 weeks post-operation.
- Intraarticular Gd-DTPA injections did not improve the imaging of pathological changes.
Conclusions:
- MR tomography is a valuable tool for diagnosing meniscus tears in a porcine model.
- The timing of imaging is crucial for optimal visualization, with a window between 2 and 8 weeks post-injury.
- MR tomography offers limited potential for assessing the age of meniscus tears and associated degenerative changes.