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Magnetic resonance imaging and histopathology in femoral head necrosis
Y Takatori1, M Kamogawa, T Kokubo
1Department of Orthopedics, Faculty of Medicine, University of Tokyo, Japan.
Abstract:
We correlated preoperative magnetic resonance (MR) images and histopathology of eight femoral heads from patients with osteonecrosis. The signal intensity of the MR image was low in the area where fibrovascular tissue, disintegrated fibrovascular tissue, or amorphous necrotic material occupied the medullary space. On the other hand, the necrotic marrow without revascularization showed high signal intensity. Osteonecrosis can be detected by MR imaging as soon as a certain amount of bone marrow is replaced by fibrovascular tissue.
Insights
Magnetic resonance (MR) imaging detects osteonecrosis by identifying signal intensity changes in femoral heads. This technique reveals early-stage bone marrow replacement by fibrovascular tissue, aiding diagnosis.
Area of Science:
- Orthopedics
- Radiology
- Pathology
Background:
- Osteonecrosis involves bone death, often affecting the femoral head.
- Accurate early diagnosis is crucial for effective treatment and joint preservation.
Purpose of the Study:
- To correlate magnetic resonance (MR) imaging findings with histopathology in osteonecrosis of the femoral head.
- To determine the utility of MR imaging in detecting early-stage osteonecrosis.
Main Methods:
- Preoperative MR images of eight femoral heads were obtained from patients diagnosed with osteonecrosis.
- Histopathological analysis of the corresponding femoral head tissues was performed.
- Correlation between MR imaging signal intensity and histological findings was established.
Main Results:
- Low signal intensity on MR images corresponded to medullary spaces occupied by fibrovascular tissue, disintegrated fibrovascular tissue, or necrotic material.
- High signal intensity was observed in necrotic bone marrow lacking revascularization.
- MR imaging detected osteonecrosis when bone marrow replacement by fibrovascular tissue reached a certain threshold.
Conclusions:
- MR imaging is a valuable tool for detecting osteonecrosis of the femoral head.
- Specific signal intensity patterns on MR images correlate with distinct histopathological features of osteonecrosis.
- Early detection of osteonecrosis is feasible with MR imaging, facilitating timely intervention.