|perthes disease hip radiology||0.85||0.3||5968||91|
In Perthes, x-rays will show changes to the appearance and the shape of the femoral head. Based on the changes, the stage of the disease can be determined. Magnetic resonance imaging (MRI) using gadolinium contrast can assess the blood flow to the femoral head and provide more detailed information about how much of the femoral head is affected.What are the radiographs of Legg Calve Perthes disease?
Radiographs of both hips showing flattening and fragmentation of the right proximal femoral epiphysis, affecting mainly its lateral two-thirds, with evident metaphyseal reaction. There is partial extrusion of the right femoral head and remodeling of the acetabular cavity, which is widened and shallow.How is the prognosis of Perthes disease determined?
Prognosis is also influenced by the percentage of femoral head involvement and degree of primary deformity of the femoral head and the secondary osteoarthritic changes that ensue. Children with over 50% of femoral head necrosis at time of diagnosis should be considered for operative management 14 .What causes the femoral head to collapse in Perthes disease?
The specific cause of osteonecrosis in Perthes disease is unclear. Osteonecrosis generally occurs secondary to abnormal or damaged blood supply to the femoral epiphysis, leading to fragmentation, bone loss, and eventual structural collapse of the femoral head.