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KMID : 1103720180790040208
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Journal of the Korean Society of Radiology
2018 Volume.79 No. 4 p.208 ~ p.217
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Magnetic Resonance-Based Grading of Psoas and Paraspinal Muscle Edema: Is It Helpful in Diagnosing Lumbar Transverse Process Fractures?
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Jeong Hyun-Seok
Jin Wook
Park Yong-Sung
Yun Seong-Jong
Park So-Young
Park Ji-Seon
Ryu Kyung-Nam
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Abstract
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Purpose: To determine the reliability of edema grading of the psoas and paraspinal muscles on axial T2-weighted magnetic resonance (MR) image (T2WI) for the detection of lumbar transverse process (TP) fractures.
Materials and Methods: A retrospective review of lumbar spine MR images of 56 patients (mean age = 56.1 years, age range = 17?87 years, male:female = 28:28) was conducted by 2 radiologists. Based on the axial T2WI at the disc level, the paraspinal muscles were classified into 4 compartments and muscle edema (increased signal intensity on axial T2WI) grading performed for each quadrant.
Results: A total of 486 TPs (with fracture: 24, without fracture: 462) of 56 patients were evaluated. Muscle edema grade showed moderate correlation with the presence of TP fracture (ρ = 0.466). When the total score of muscle edema was 2.50, the receiver operating characteristic curve showed a sensitivity of 72.7% and a specificity of 90.7%. A higher edema grade had a significantly higher probability of concomitant TP fracture [any sided (total): odds ratio = 1.704 (95% confidence interval = 1.410?2.060)].
Conclusion: Edema grading of the psoas and paraspinal muscles on axial T2WI of lumbar spine can be helpful in the detection of TP fracture.
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KEYWORD
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Muscle, Edema, Lumbar Vertebrae, Magnetic Resonance Imaging, Spinal Fractures
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