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  2. Chandler's disease - Wikipedia

    en.wikipedia.org/wiki/Chandler's_disease

    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.

  3. Crescent sign - Wikipedia

    en.wikipedia.org/wiki/Crescent_sign

    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]

  4. Avascular necrosis - Wikipedia

    en.wikipedia.org/wiki/Avascular_necrosis

    Other techniques, such as metal-on-metal resurfacing, may not be suitable in all cases of avascular necrosis; its suitability depends on how much damage has occurred to the femoral head. [23] Bisphosphonates, which reduce the rate of bone breakdown, may prevent collapse (specifically of the hip) due to AVN. [24]

  5. Dysbaric osteonecrosis - Wikipedia

    en.wikipedia.org/wiki/Dysbaric_osteonecrosis

    Stage 3 - Dead bone with repair and with collapse Stage 4 - Secondary degenerative arthritis In a study of bone lesions in 281 compressed air workers done by Walder in 1969, [ clarification needed ] 29% of the lesions were in the humeral head (shoulder), 16% in the femoral head (hip), 40% in the lower end of the femur (lower thigh at the knee ...

  6. Femoroacetabular impingement - Wikipedia

    en.wikipedia.org/wiki/Femoroacetabular_impingement

    Three types of FAI are recognized (see title image). The first involves an excess of bone along the upper surface of the femoral head, known as a cam deformity (abbreviation for camshaft, which the shape of the femoral head and neck resembles). The second is due to an excess of growth of the upper lip of the acetabular cup and is known as a ...

  7. Legg–Calvé–Perthes disease - Wikipedia

    en.wikipedia.org/wiki/Legg–Calvé–Perthes...

    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.

  8. Radiographic classification of osteoarthritis - Wikipedia

    en.wikipedia.org/wiki/Radiographic...

    In the temporomandibular joint, subchondral sclerosis of the mandibular condyle has been described as an early change, condylar flattening as a feature of progressive osteoarthritis, and narrowing of the temporomandibular joint space as a late stage change. [14] A joint space of between 1.5 and 4 mm is regarded as normal. [15] Ankle osteoarthritis.

  9. Hip pain - Wikipedia

    en.wikipedia.org/wiki/Hip_pain

    Staging according to Ficat classification ranges between normal appearance (stage I), slight increased density in the femoral head (stage II), subchondral collapse of the femoral head with or without “crescent” sign (stage III), and advanced collapse with secondary osteoarthritis (stage IV).