Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

For unilateral sacral extension, how does the spring test typically present?

1. Always negative

2. Always positive

3. Sometimes negative

4. Sometimes positive

The correct answer is: Always negative

In the context of a unilateral sacral extension, the spring test, which assesses the mobility of the sacrum, typically presents as negative. This is because unilateral sacral extension often results in a restriction of normal motion. During the spring test, a physician applies a gentle force to the sacrum; if the sacrum is restricted and does not spring back, this indicates that the sacrum is not moving freely, which correlates with a negative test result. When the sacrum is extended on one side, it can create a sense of firmness and reduced mobility in that direction. Therefore, the negative finding during the spring test is suggestive of a dysfunction rather than normal movement, aligning with the characteristics of unilateral sacral extension. Understanding how this test correlates with sacral motion is essential for diagnosing sacral dysfunction in osteopathic practice.