The success of a spinal fusion is often judged by the amount of relative motion between vertebrae following surgery. Proper fusion is aided by fixation instrumentation as well as bone growth subsequent to surgery. In order to allow for proper fusion it is necessary for instrumentation to properly fix the vertebrae until sufficient bone growth has occurred. In many cases pedicle screws are used to provide posterior support. It is the purpose of posterior instrumentation to increase the rate of fusion [1]. However, due to deterioration in the holding capacity of the posterior instrumentation; the quality of the fixed joint can begin to degrade. If this deterioration is significant enough it requires removal or revision of the fixation instrumentation.

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