MRI-based distal femur cortical thickness analysis for osteoporosis detection
1Department of Radiology, Umraniye Training and Research Hospital, University of Health Sciences, Istanbul 34764, Turkey.
The British Journal of Radiology
|June 26, 2025
Summary
Routine knee MRI can detect osteoporosis by measuring femur cortex thickness. This offers a fast, opportunistic screening method for early diagnosis and management of bone density loss.
Area of Science:
- Radiology
- Orthopedics
- Bone Metabolism
Background:
- Osteoporosis diagnosis typically relies on bone mineral density (BMD) scans like DXA.
- There is a need for opportunistic and accessible methods for osteoporosis screening.
Purpose of the Study:
- To evaluate distal femur cortex thickness on knee MRI as a diagnostic tool for osteoporosis.
- To determine if these MRI measurements correlate with BMD and can facilitate early osteoporosis detection.
Main Methods:
- Retrospective study including 74 patients with knee MRI and DXA scans.
- Measurements included average cortical bone thickness (CBTavg), DFCI-1, and DFCI-2 from knee MRIs.
- Radiologist blinded to DXA scores performed measurements; statistical analysis used Mann-Whitney U and ROC analysis.
Main Results:
- Significant differences in CBTavg, DFCI-1, and DFCI-2 were observed between normal BMD and osteopenia/osteoporosis groups (P < 0.01).
- Receiver operating characteristic (ROC) analysis demonstrated high diagnostic accuracy: AUC 0.92 for CBTavg, 0.90 for DFCI-1, and 0.91 for DFCI-2.
- Optimal cut-off values were established for each measurement to differentiate bone density status.
Conclusions:
- Distal femur cortex thickness on routine knee MRI is an effective method for diagnosing osteopenia/osteoporosis.
- This approach provides a simple, rapid, and practical means for opportunistic osteoporosis screening.
- The findings support early intervention and improved management strategies for bone density loss.
