Cobalt Rod

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A Hard, Lustrous, Silvery, and Brittle Metal

Similar to Iron and Nickel in Physical Properties
Cobalt is an essential element in a variety of high-performance alloys, magnets and magnetic materials. Its ferromagnetic properties are important in gas turbine aircraft engines and other places where high-temperature strength is needed.

A Radioactive, X-ray Isotope and Potential Health Hazard

The most common radioactive of cobalt is cobalt-60 (Co-60). It decays by gamma radiation and can increase the risk of cancer from exposure to the resulting ionization of the liver, kidneys or bones. It occurs as a byproduct of nuclear reactor operations, and is also used as a source of medical and industrial radiation.

A Safe and Reliable Material for Adolescent Idiopathic Scoliosis Surgery

Recent advances in adolescent idiopathic scoliosis surgery have led to the use of CoCr rods. These implants have demonstrated significant frontal correction rates in all-screw constructs. However, the effect of rod material on posteromedial translation in AIS has not been investigated.

To determine the effects of rod deformation on reduction force, roll formed pre-contoured and manually contoured 5.5 mm and 6.0 mm Co-Cr rods were reduced to a rigid, thoracolumbar spinal deformity model fixed with pedicle screws. Corrective force was measured with a load cell attached to the apical screw.

Roll-formed pre-contoured rods showed significantly greater plastic deformation when compared with manually contoured rods of the same diameter. Moreover, the rods required significantly less load for rod reduction than did manually contoured rods. These findings indicate that post-manufacturing, roll-formed pre-contouring of larger diameter Co-Cr may impair the rods mechanical properties. This finding should be emphasized when choosing rod material for adolescent idiopathic spinal deformity treatment.