Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

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Which grade represents a spondylolisthesis with 50-75% slippage?

Grade 1

Grade 2

Grade 3

In the classification of spondylolisthesis, the degree of slippage is categorized into grades based on the percentage of displacement of one vertebra over another. A spondylolisthesis with 50-75% slippage is classified as Grade 2. This grade indicates a moderate level of displacement, where a vertebra has slipped forward over the one beneath it, but it is not completely displaced.

To clarify, Grade 1 is characterized by 0-25% slippage, representing a mild displacement; Grade 2 refers to slippage between 26-50%, which is still considered moderate; Grade 3 indicates 76-100% slippage, marking a severe case that can lead to significant instability; and Grade 4 also refers to 100% slippage but is often considered in discussions of complete dislocation.

Therefore, the correct classification for a spondylolisthesis featuring 50-75% slippage is Grade 2.

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Grade 4

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