Findings
Coronal T1 (a), PDFS (b), Axial T1 (c) and sagittal T1 MRI images of knee joint reveal serpiginous T1 hypointense, PDFS hyperintense signal in medial and lateral femoral condyles with adjacent marrow edema, predominantly in medial femoral condyle.
Diagnosis
Osteonecrosis of the knee
Summary
Osteonecrosis of the knee (also known as avascular necrosis) is a painful condition that occurs when the blood supply to a section of bone is disrupted. The area most commonly affected is the femoral head, followed by the humeral head and the knee. There seem to be two distinct forms of this condition: the idiopathic, primary or spontaneous osteonecrosis of the knee, which appears in patients without risk factors for osteonecrosis, and secondary osteonecrosis, caused by a number of well‐recognized predisposing factors. Predisposing factors include alcoholism, renal transplantation, connective tissue disorders, thalassemia, leukemia, and systemic steroid administration. Regardless of the cause, if osteonecrosis is not identified and treated early, it can develop into severe osteoarthritis.
Further reads
J. Narváez, J. A. Narváez, J. Rodriguez‐Moreno, D. Roig‐Escofet, Osteonecrosis of the knee: differences among idiopathic and secondary types, Rheumatology, Volume 39, Issue 9, September 2000, Pages 982–989, https://doi.org/10.1093/rheumatology/39.9.982
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