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Accuracy and limitations of diagnostic methods for avascular necrosis of the hip
1University Hospital, Department of Medical Imaging, Crete, Greece. akarantanas@gmail.com
Insights
Magnetic resonance imaging (MRI) offers significant advantages over X-rays for diagnosing femoral head avascular necrosis (FHAVN), aiding in early detection and treatment planning. Current advanced MRI techniques do not yet provide additional clinical benefits for FHAVN assessment.
Area of Science:
- Orthopedics
- Radiology
- Medical Imaging
Background:
- Femoral head avascular necrosis (FHAVN) is bone cell death due to lack of blood supply, leading to joint collapse and arthritis.
- This condition commonly affects young males and necessitates accurate classification systems for effective management.
Purpose of the Study:
- To review current data on the diagnostic accuracy of X-rays and MRI for FHAVN.
- To evaluate the role of imaging in monitoring and postoperative assessment of FHAVN.
Main Methods:
- Comparison of diagnostic capabilities of radiography and MRI in FHAVN.
- Review of literature on imaging modalities for FHAVN classification and evaluation.
Main Results:
- MRI is crucial for early, pre-radiographic detection of FHAVN.
- MRI assesses lesion size and location before articular surface collapse.
- X-rays and MRI are key imaging methods in current FHAVN classification systems.
Conclusions:
- MRI can enhance FHAVN staging, identify occult collapse, and aid in prognosis and treatment evaluation.
- Advanced MRI techniques like diffusion-weighted and perfusion imaging currently lack proven clinical utility for FHAVN.
Introduction:
Femoral head avascular necrosis (FHAVN) is the result of irreversible anoxia of the subchondral bone. The death of bone cells can cause articular collapse and pain, and in turn usually leads to degenerative arthritis. FHAVN is a common disorder, affecting mainly young male adults. Reliability, accuracy and prognostic value of any classification system are important in evaluation and treatment of FHAVN.
Areas Covered:
Although in the past, scintigraphy and CT and more recently PET have been used for diagnosing AVN, currently the most important imaging methods included in the most widely used classification systems, consist of radiographs and magnetic resonance imaging (MRI). The latter is used in major classification systems for early detection (pre-radiographic stage) of FHAVN and for assessing lesion size and location before collapse of the articular surface occurs. The purpose of this review is to present the current data regarding the accuracy of the X-rays and MRI in diagnosing, monitoring and postoperative evaluation of FHAVN.
Expert Opinion:
The author's opinion is that MRI may contribute to improve staging, investigate radiologically occult collapse, depict other causes of disability and pain, assess prognosis and evaluate treatment. Newer MRI techniques, such as diffusion-weighted imaging and perfusion imaging, have not yet provided additional and clinically useful information.
