HEALING OF A FRACTURE IN CORTICAL BONE With AO

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HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION The fracture site is stress protected and indeed the bone hardly knows it has been fractured. The Association for Osteosynthesis (AO) / Association for the Study of Internal Fixation (ASIF) system of fracture treatment achieves such reduction and fixation.

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION Under these circumstances, there is no stimulus for the production of either external callus from the periosteum or internal callus from the endosteum. Consequently, the fracture healing occurs directly between the cortex of one fracture fragment and the cortex of the other fracture fragment.

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION This process is referred to by the AO/ASIF surgeons as primary bone healing As opposed to the secondary bone healing involving external and internal fracture callus. In the areas of precise contact (that are under compression), osteoclastic “cutter heads” cross the microscopic fracture site and are followed by new bridging osteons.

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION Even when there is a tiny gap, the healing is direct by the formation of new osteons that become oriented through haversian remodelling to the axis of the bone. As long as the metallic device remains in place, the bone underlying the plate continues to be stress protected, because the normal stresses bypass the bone through the plate.

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION : 

HEALING OF A FRACTURE IN CORTICAL BONE WITH RIGID INTERNAL FIXATION The bone in this region tends to develop disuse osteoporosis, which is sometimes referred to as “stress-relief osteoporosis”. For this reason, when the fracture has united , the plate ad screws may have to be removed to allow reversal of this osteoporosis. During the ensuing few months, the healed bone must be protected from excessive stress until it regains its normal strength.

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