The polyaxial screw is used for connecting vertebraeto rods in spinal surgery. It is essentially a screw whose spherical head is enclosed on a housing, which allows the screw a range of motion along several different axes relative to the housing. The ball joint allows the surgeon some flexibility in placing the screws.
Categories: Medicine stubs| Surgery
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It uses material from the http://en.wikipedia.org/wiki/Polyaxial+screw Wikipedia article Polyaxial screw.