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The "Honda sign" (H-pattern [1]) is a radiologic sign seen in case of sacral insufficiency fracture in bilateral sacral insufficiency fractures on a radioisotope bone scan. [2] It gets its name because the shape observed resembles the logo of the Honda motor company, resembling the alphabet "H".
In long bones, chronic joint diseases such as rheumatoid arthritis are associated with angular deformity and flexion contraction, increasing the stress on the bone around the joints and, therefore, the risk of insufficiency fracture. Pelvic, sacral, and proximal femoral fractures are of increasing significance especially with the aging of the ...
A sacral fracture is a break in the sacrum bone. The sacrum is the large triangular bone that forms the last part of the vertebral column from the fusion of the five sacral vertebrae. Sacral fractures are relatively uncommon. They tend to be caused by high-energy trauma, for example in road traffic accidents or in falls. [1] They are ...
A bone scan or bone scintigraphy / s ɪ n ˈ t ɪ ɡ r ə f i / is a nuclear medicine imaging technique used to help diagnose and assess different bone diseases. These include cancer of the bone or metastasis, location of bone inflammation and fractures (that may not be visible in traditional X-ray images), and bone infection (osteomyelitis).
Sacral insufficiency fractures are an infrequent but often disabling cause of severe low back pain. At times, the pain can be so severe that it may cause the patients to become bedridden, placing them at risk for complications of immobility such as deep vein thrombosis, pulmonary emboli, muscle atrophy, decubitus ulcers, and bone demineralization.
Each innominate bone (ilium) joins the femur (thigh bone) to form the hip joint; thus the sacroiliac joint moves with walking and movement of the torso. [9] In this joint, hyaline cartilage on the sacral side moves against fibrocartilage on the iliac side. The sacroiliac joint contains numerous ridges and depressions that function in stability.
A pathologic fracture is a bone fracture caused by weakness of the bone structure that leads to decrease mechanical resistance to normal mechanical loads. [1] This process is most commonly due to osteoporosis, but may also be due to other pathologies such as cancer, infection (such as osteomyelitis), inherited bone disorders, or a bone cyst.
The Young–Burgess classification is a system of categorizing pelvic fractures based on the vector of applied force at the time of injury and degree of resulting disruption, allowing judgment on the stability of the pelvic ring and prediction of associated blood loss. [1]