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Avascular necrosis; Other names: Osteonecrosis, [1] bone infarction, [2] aseptic necrosis, [1] ischemic bone necrosis [1] Femoral head showing a flap of cartilage due to avascular necrosis (osteochondritis dissecans). Specimen removed during total hip replacement surgery. Specialty: Orthopedics: Symptoms: Joint pain, decreased ability to move ...
Necrotic bone and inflammation histology slide. The current etiology or origin of this disease is unknown. Some studies theorized that bone remodeling is maintained in a microenvironment in the FH meaning that there is a greater local component to changes to the femoral head than the normal systemic way that bone remodeling is handled throughout the body.
The medial circumflex femoral artery is the principal source of blood supply to the femoral head. LCP disease is a vascular restrictive condition of idiopathic nature. Symptoms like femoral head disfigurement, flattening, and collapse occur typically between ages four and ten, mostly male children of Caucasian descent.
Two forms of femoral dysplasia are coxa vara, in which the femur head grows at too narrow an angle to the shaft, and coxa valga, in which the angle is too wide. A rare type, the "Beukes familial hip dysplasia" is found among Afrikaners that are members of the Beukes family. The femur head is flat and irregular.
On the AP view Klein’s line, tangent to the lateral aspect of the femoral neck, does not intersect the femoral head indicating that it is displaced. SCFE may compromise the blood supply to the femoral head and cause avascular necrosis, mainly when there is instability between the fragments. [1]
Borderline: 69° to 82° in men, 51° to 56° in women; Pathological: ≥83° in men and ≥57° in women; Femoral head-neck offset Measured in cross-lateral view. Offset of the femoral head with regard to most prominent aspect of the femora neck >10 mm Offset percentage Femoral head-neck offset related to femoral head diameter >0.18
Protrusio acetabuli is an uncommon defect of the acetabulum, the socket that receives the femoral head to make the hip joint. The hip bone of the pelvic bone/girdle is composed of three bones, the ilium, the ischium and the pubis. In protrusio deformity, there is medial displacement of the femoral head in that the medial aspect of the femoral ...
In radiology, the crescent sign is a finding on conventional radiographs that is associated with avascular necrosis. [1] [2] [3] It usually occurs later in the disease, in stage III of the four-stage Ficat classification system. [1] It appears as a curved subchondral radiolucent line that is often found on the proximal femoral or humeral head. [1]