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Media Gallery

Avascular necrosis in the femoral head resulting from corticosteroid therapy.
Avascular necrosis of the shoulder showing subchondral radiolucent lines (crescent sign).
Avascular necrosis of both femoral heads. This T1-weighted image shows decreased signal intensity in both femoral heads.
MRI of the distal femur and proximal tibia. This T2-weighted image shows increased signal intensity in the marrow.

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Staging of Avascular Necrosis

Staging of Avascular Necrosis

Stage	Clinical and Laboratory Findings
Stage 0	Patient is asymptomatic. Radiography findings are normal. Histology findings demonstrate osteonecrosis.
Stage I	Patient may or may not be symptomatic. Radiography and CT scan findings are unremarkable. AVN is considered likely based on MRI and bone scan results (may be subclassified by extent of involvement [see below]). Histology findings are abnormal.
Stage II	Patient is symptomatic. Plain radiography findings are abnormal and include osteopenia, osteosclerosis, or cysts. Subchondral radiolucency is absent. MRI findings are diagnostic.
Stage III	Patient is symptomatic. Radiographic findings include subchondral lucency (crescent sign) and subchondral collapse. Shape of the femoral head is generally preserved on radiographs and CT scans. Subclassification depends on the extent of crescent, as follows: Stage IIIa: Crescent is less than 15% of the articular surface. Stage IIIb: Crescent is 15-30% of the articular surface. Stage IIIc: Crescent is more than 30% of the articular surface.
Stage IV	Flattening or collapse of femoral head is present. Joint space may be irregular. CT scanning is more sensitive than radiography. Subclassification depends on the extent of collapsed surface, as follows: Stage IVa: Less than 15% of surface is collapsed. Stage IVb: Approximately 15-30% of surface is collapsed. Stage IVc: More than 30% of surface is collapsed.
Stage V	Radiography findings include narrowing of the joint space, osteoarthritis with sclerosis of acetabulum, and marginal osteophytes.
Stage VI	Findings include extensive destruction of the femoral head and joint.

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Author

Sunny B Patel, MD Chief Fellow, Department of Rheumatology, LSU Health Sciences Center

Sunny B Patel, MD is a member of the following medical societies: American College of Physicians, American College of Rheumatology, Louisiana State Medical Society

Disclosure: Nothing to disclose.

Specialty Editor Board

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Lawrence H Brent, MD Associate Professor of Medicine, Sidney Kimmel Medical College of Thomas Jefferson University; Chair, Program Director, Department of Medicine, Division of Rheumatology, Albert Einstein Medical Center

Lawrence H Brent, MD is a member of the following medical societies: American Association for the Advancement of Science, American Association of Immunologists, American College of Physicians, American College of Rheumatology

Disclosure: Stock ownership for: Johnson & Johnson.

Chief Editor

Herbert S Diamond, MD Visiting Professor of Medicine, Division of Rheumatology, State University of New York Downstate Medical Center; Chairman Emeritus, Department of Internal Medicine, Western Pennsylvania Hospital

Herbert S Diamond, MD is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, American College of Rheumatology, American Medical Association, Phi Beta Kappa

Disclosure: Nothing to disclose.

Additional Contributors

Bryan L Martin, DO Associate Dean for Graduate Medical Education, Designated Institutional Official, Associate Medical Director, Director, Allergy Immunology Program, Professor of Medicine and Pediatrics, Ohio State University College of Medicine

Bryan L Martin, DO is a member of the following medical societies: American Academy of Allergy Asthma and Immunology, American College of Allergy, Asthma and Immunology, American College of Osteopathic Internists, American College of Physicians, American Medical Association, American Osteopathic Association

Disclosure: Nothing to disclose.

Richa Dhawan, MD, CCD Associate Professor, Director of Osteoporosis Clinic, Center of Excellence for Arthritis and Rheumatology, Louisiana State University Health Science Center at Shreveport

Richa Dhawan, MD, CCD is a member of the following medical societies: American College of Physicians-American Society of Internal Medicine, American College of Rheumatology, American Association of Physicians of Indian Origin

Disclosure: Nothing to disclose.

Jeanne K Tofferi, MD, MPH, FACP Assistant Chief, Department of Rheumatology, Walter Reed Army Medical Center

Jeanne K Tofferi, MD, MPH, FACP is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians

Disclosure: Nothing to disclose.

Acknowledgements

William Gilliland, MD, MPHE, FACP, FACR Staff Rheumatologist, Walter Reed Army Medical Center; Professor of Medicine, Assistant Dean of Curriculum, Uniformed Services University of the Health Sciences

Disclosure: Nothing to disclose.

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