Evaluation of patellar cartilage in cadavers with a low-field-strength extremity-only magnet: Comparison of MR imaging sequences, with macroscopic findings as the standard

被引:23
作者
Ahn, JM
Kwak, SM
Kang, HS
Muhle, C
Pedowitz, PA
Frank, LR
Trudell, D
Haghighi, P
Resnick, D
机构
[1] Vet Affairs Med Ctr, Dept Radiol, San Diego, CA 92161 USA
[2] Vet Affairs Med Ctr, Dept Orthoped Surg, San Diego, CA 92161 USA
[3] Vet Affairs Med Ctr, Dept Pathol, San Diego, CA 92161 USA
[4] Seoul Natl Univ Hosp, Dept Radiol, Seoul 110744, South Korea
关键词
cartilage; knee; MR; magnetic resonance (MR); comparative studies; patella;
D O I
10.1148/radiology.208.1.9646793
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
PURPOSE: To assess a low-field-strength extremity-only magnet-in the evaluation patellar cartilage abnormalities. MATERIALS AND METHODS: Four regions in each of 10 patellae from cadavers were examined in the transaxial plane with a 0.2-T extremity-only magnet and the following sequences: T1-weighted spin echo, proton density- and T2-weighted turbo spin echo, short inversion time inversion recovery, and two- and three-dimensional gradient echo with and without magnetization transfer contrast subtraction. Lesions depicted with MR imaging and seen in anatomic sections of the patellae were classified according to a modified standardized arthroscopic grading system. MR imaging and pathologic correlation was then analyzed. RESULTS: On the basis of macroscopic findings, 14 of 40-cartilage regions were found to be intact, grade 2A lesions were present in eight regions, grade 2B lesions in eight, and grade 3 lesions in 10. For the various MR-imaging techniques, sensitivity was 25%-62% for grade 2A lesions, 50%-75% for grade 2B lesions, and 60%-90% for grade 3 lesions. Specificity was 81%-97% for grades 2A and 2B lesions, and 80%-97% for grade 3 lesions. Accuracy was 75%-82% for grade 2A lesions, 75%-92% for grade 2B lesions, and 80%-92% for grade 3 lesions. CONCLUSION: High-grade cartilaginous lesions can be evaluated reliably with low-field-strength MR imaging by using a combination of imaging sequences.
引用
收藏
页码:57 / 62
页数:6
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