"T1: usually the initial specific findings are areas of low signal intensity representing oedema, which can be bordered by a hyperintense line that represents blood products"
"T2: may show a second hyperintense inner line between normal marrow and ischaemic marrow; this appearance is highly specific for osteonecrosis of the hip and is known as the "double-line sign""
"See also "
"Typically it affects the superior articular surface (between 10-2 o'clock) and begins in the most anterior part of the hip."
"Several staging systems for osteonecrosis of the hip exist. The earliest and most commonly used is the Ficat and Arlet classification (1980) which includes x-ray, MRI and bone scan appearances. The Steinberg classification (1995) is similar but quantifies the involvement of the femoral head. The Mitchell classification (1987) is commonly utilised for MRI images. The ARCO classification (2019) encompasses both x-ray and MRI 10."
"ARCO classification"
"Pitt pit"
Expected headings
"Staging"
"See also "
"Idiopathic osteonecrosis of the femoral head epiphysis in children (Perthes disease) is typically considered separately; thus the remainder of the article pertains to osteonecrosis in the skeletally mature population."
"T2: may show a second hyperintense inner line between normal marrow and ischaemic marrow; this appearance is highly specific for osteonecrosis of the hip and is known as the "double-line sign""
"Several staging systems for osteonecrosis of the hip exist. The earliest and most commonly used is the Ficat and Arlet classification (1980) which includes x-ray, MRI and bone scan appearances. The Steinberg classification (1995) is similar but quantifies the involvement of the femoral head. The Mitchell classification (1987) is commonly utilised for MRI images. The ARCO classification (2019) encompasses both x-ray and MRI 10."
"Several staging systems for osteonecrosis of the hip exist. The earliest and most commonly used is the Ficat and Arlet classification (1980) which includes x-ray, MRI and bone scan appearances. The Steinberg classification (1995) is similar but quantifies the involvement of the femoral head. The Mitchell classification (1987) is commonly utilised for MRI images. The ARCO classification (2019) encompasses both x-ray and MRI 10."