AI Article Synopsis
- - This study explored the relationship between MRI findings and actual tissue degeneration in the anterior cruciate ligament (ACL) of patients with knee osteoarthritis (OA), aiming to create a new grading system based on MRI results matching histological analysis.
- - Researchers analyzed 106 ACL specimens from patients who had knee surgery, calculating the signal intensity of the ACL compared to muscle on MRI to assess degeneration.
- - The findings showed a strong correlation between MRI signal intensity ratios and the degree of collagen degeneration, leading to a new grading system that classifies ACL degeneration into three levels, potentially improving diagnosis and treatment of knee OA.
Article Abstract
Background: This study aimed to investigate association between magnetic resonance imaging (MRI) and histological findings of degenerated anterior cruciate ligament (ACL) in knee osteoarthritis (OA), and based on this result, to develop a new ACL degeneration grading system by MRI that corresponds to histological findings of degenerated ACL.
Hypothesis: MRI signal intensity of the ACL could correspond to histological findings of collagen degeneration.
Patients And Methods: A collection of 106 ACL specimens from 85 patients who underwent primary total knee arthroplasty was investigated for signal intensity of the ACL and muscle on axial Fat-saturated proton density-weighted MRI and MRI signal intensity ratio (ACL/muscle) was calculated. The correlation between ACL histological degeneration and MRI ACL/muscle signal intensity ratio was analyzed. The ACL was stratified into 3 grades based on signal intensity relative to muscle intensity (grade 1, low; grade 2, iso; and grade 3, high), and the extent to ACL degeneration in each MRI ACL degeneration grade was evaluated.
Results: Collagen degeneration (53.5±24.0%) and myxoid change (25.2±18.8%) in degenerated ACL significantly correlated with MRI signal intensity ratio of the ACL/muscle (r=0.62, p<0.0001; r=0.67, p<0.0001). ACL were assigned to grade 1 (n=22 [20.8%]), grade 2 (n=56 [52.8%]), and grade 3 (n=28 [26.4%]). ACL collagen degeneration was 34.8±18.4% in grade 1, 49.3±21.7% in grade 2, and 76.6±12.0% in grade 3. ACL myxoid change was 10.0±11.3% in grade 1, 21.3±14.1% in grade 2, and 45.0±15.3% in grade 3.
Discussion: The ACL/muscle signal intensity ratio on MRI correlated with the extent to ACL myxoid degeneration. The new MRI ACL degeneration grade is helpful to estimate the extent to ACL myxoid degeneration in knee OA.
Level Of Evidence: III; retrospective cohort study.
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| http://dx.doi.org/10.1016/j.otsr.2023.103740 | DOI Listing |
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