The approximation and resulting pseudoarthrosis of two or more spinous processes describes __________.

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The approximation and resulting pseudoarthrosis of two or more spinous processes is called Baastrup's phenomenon, also known as "kissing spines." It is commonly seen in the lumbar spine and can lead to spinal degeneration and back pain. Butterfly vertebra, shingling, and Klippel-Feil syndrome are different spinal conditions not related to pseudoarthrosis of spinous processes.

The Approximation and Resulting Pseudoarthrosis of Two or More Spinous