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Transient osteoporosis of the hip: MR imaging
1Department of Diagnostic Radiology, University Hospital of Leiden, The Netherlands.
Abstract:
Three patients with transient osteoporosis of the hip underwent magnetic resonance (MR) imaging. MR images showed decreased signal intensity of bone marrow in the femur on T1-weighted images and increased signal intensity relative to the intensity of normal bone marrow on T2-weighted images. Joint effusions were seen on MR images of all patients on T2-weighted images. The findings on MR images concurred with histologic findings, such as increased bone turnover and mild inflammatory reaction, in one patient. The clinical symptoms and abnormalities on MR images regressed completely within 6-10 months. Familiarity with the distinct features of transient osteoporosis on MR images may be important in the differential diagnosis of adults with hip pain.
Insights
Transient osteoporosis of the hip shows distinct bone marrow changes on magnetic resonance (MR) imaging. These MR imaging findings correlate with histologic results and resolve within months, aiding hip pain diagnosis.
Area of Science:
- Radiology
- Orthopedics
- Bone Diseases
Background:
- Transient osteoporosis of the hip is a condition causing temporary bone weakness.
- Magnetic resonance (MR) imaging is a key diagnostic tool for musculoskeletal conditions.
Purpose of the Study:
- To describe the characteristic MR imaging findings in transient osteoporosis of the hip.
- To correlate MR imaging findings with clinical and histologic data.
- To assess the natural history of transient osteoporosis of the hip on MR imaging.
Main Methods:
- Retrospective analysis of MR imaging in three patients diagnosed with transient osteoporosis of the hip.
- Detailed evaluation of bone marrow signal intensity on T1- and T2-weighted images.
- Correlation with available histologic findings and clinical follow-up.
Main Results:
- MR imaging revealed decreased bone marrow signal intensity on T1-weighted images and increased signal intensity on T2-weighted images in the affected femur.
- Joint effusions were consistently observed on T2-weighted images.
- Findings correlated with increased bone turnover and mild inflammation in one patient, with complete resolution of symptoms and imaging abnormalities within 6-10 months.
Conclusions:
- Distinct MR imaging features are characteristic of transient osteoporosis of the hip.
- MR imaging findings are consistent with the underlying pathophysiology of increased bone turnover.
- Recognition of these MR imaging patterns is crucial for differential diagnosis in adults presenting with hip pain.