Which term describes the forward slipping of an upper vertebral body?

The term that describes the forward slipping of an upper vertebral body is spondylolisthesis. This condition occurs when one vertebra slips forward over the vertebra directly beneath it, which can lead to spinal instability and may cause pain or neurological symptoms depending on the degree of slippage and any resultant compression of spinal structures.

Spondylolisthesis often arises due to degenerative changes in the spine, such as those that may occur with aging, or it may result from a structural defect or fracture in the vertebra itself. Identification of this condition is crucial for treatment planning, which can range from conservative management to surgical intervention, depending on severity and symptomatology.

In contrast, while the other terms—spondylosis, spondylitis, and spondylolysis—refer to different spinal issues, none accurately define the forward displacement characteristic of spondylolisthesis. Spondylosis generally refers to degenerative changes in the spine, spondylitis involves inflammation of the vertebrae, and spondylolysis indicates a defect or fracture in one of the vertebrae, particularly in the pars interarticularis. Each of these conditions presents different clinical considerations and impacts on patient management.