FNP Family Nurse Practitioner Exam Prep

Category - Women's Health Nurse Practitioner

Which of these muscles flexes and externally rotates the hips, and may be a cause of lower back in pain in a patient?

  1. Psoas major
  2. Quadratus lumborum
  3. Flexor digitalis
  4. Vastus medialis
  5. Gluteus maximus
Explanation

Answer: A The psoas major flexes and externally rotates the hip.  It joins with the iliacus muscle to form the iliopsoas. Tension in this muscle is a common cause of lower back pain, as it often compresses the lumbar vertebrae.

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