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Half Kneeling Hip Flexor

Screens hip flexor length and true hip extension range of motion from a half-kneeling position. Excessive lumbar extension during the test reveals compensation — a common driver of lower back pain.

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Criteria to Pass

  • The center of the hip moves in front of the knee
  • The shoulders, or shoulders and hips, remain behind the knee
  • No excessive lumbar extension — the movement must come from hip extension, not from arching the low back