Kohler's disease is an uncommon bone disorder in which the navicular bone of the foot for the time being loses its blood supply (avascular necrosis). It is caused when the navicular bone temporarily loses its blood supply.Avascular Necrosis
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Hip fracture is among the most common injuries necessitating hospital admission. A hip fracture is a fracture in the proximal end of the femur (the long bone running through the thigh), near the hip joint. Proximal femoral fractures include a broad group of common fractures of the femoral head and neck typically occurring in osteoporotic females. Proximal femoral fracture is a common injury in elderly people with a current mortality at six months in females of 16% and in males of 43%.
Avascular necrosis is a disease resulting from the temporary or permanent loss of the blood supply to the bones. Without blood, the bone tissue dies and causes the bone to collapse. If the process involves the bones near a joint, it often leads to collapse of the joint surface.
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There are many theories about what causes avascular necrosis. Proposed risk factors include alcoholism, excessive steroid use, post trauma, caisson disease (decompression sickness), vascular compression, hypertension, vasculitis, arterial embolism and thrombosis, damage from radiation, bisphosphonates (particularly the mandible), sickle cell ...Page 1 of 11










