What defect in the pars interarticularis is commonly caused by osteophyte formation?

The defect in the pars interarticularis that is commonly associated with osteophyte formation is known as spondylolysis. This condition involves a defect or fracture in the pars interarticularis, which is a region of the vertebra located between the superior and inferior articular processes. Spondylolysis can lead to instability and is often a result of chronic stress or strain on the spine, which can be exacerbated by the formation of osteophytes—bone spurs that develop in response to degenerative changes in the intervertebral discs and facet joints.

In spondylolysis, the presence of osteophytes indicates underlying degenerative changes that could contribute to the development of the defect in the pars interarticularis. These changes may result from age-related wear and tear on the spine.

While spondylosis, spondylolisthesis, and spondylitis are all conditions that can affect the spine, they represent different pathologies. Spondylosis refers to degenerative changes in the spine, including osteophyte formation, but does not specifically denote a defect in the pars interarticularis. Spondylolisthesis is the slippage of one vertebra over another