What defines Grade 1 spondylolisthesis in terms of displacement?

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Grade 1 spondylolisthesis is characterized by a forward displacement of one vertebra over another, specifically quantified as a displacement of up to 25%. This classification is part of a grading system for spondylolisthesis that categorizes the severity of the condition based on the percentage of displacement.

In this system, Grade 1 indicates a mild displacement, making it significant because it is the least severe level of spondylolisthesis. In contrast, higher grades correspond to greater degrees of displacement and often more severe clinical implications. Therefore, the correct definition for Grade 1 reflects a displacement range that is low, which is crucial for evaluating the potential impact on spinal stability and the patient’s symptoms. Understanding this classification helps in diagnosing, managing, and making decisions about treatment for patients with spondylolisthesis.

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