National Board of Chiropractic Examiners (NBCE) Practice Test

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Prepare for the National Board of Chiropractic Examiners test with flashcards and multiple choice questions. Each question includes hints and explanations to help you excel on your exam day!

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Spasm of which muscles may cause elevation of ipsilateral PSIS?

Quadratus lumborum
Rectus abdominis
Latissimus dorsi
Erector spinae

The correct answer is: Quadratus lumborum

The correct answer is based on the anatomical and functional relationships of the quadratus lumborum muscle. The quadratus lumborum is a key muscle in the lower back that assists in lateral flexion of the trunk and provides stability to the pelvis. When there is a spasm in this muscle, it can lead to an elevation of the ipsilateral (same side) posterior superior iliac spine (PSIS). This elevation occurs because the quadratus lumborum attaches to the iliac crest and the lower ribs. When this muscle spasms, it can pull upward on the iliac crest on the side of the spasm, causing the PSIS to rise, which may be clinically observed during an examination. Understanding the related mechanics of muscle function is crucial for recognizing how muscle spasms can lead to postural imbalances or compensations within the pelvis and spine, which is common in chiropractic assessments and interventions.