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OVER 98% PASS RATE FOR THE NCS, OCS, AND PCS EXAMS › forums › PCS Advantage › Normal ER in infants

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    • February 10, 2022 at 11:43 am #483823
      Heidi Lee
      Participant

      could you help clarify normal ER in infants? In your MSK developmental study guide, it states ~100 degree range, but in Campbell’s p.106, it talks about ER being 30 degrees due to cumulative effects of anteversion & antetorsion? Thanks!

    • February 11, 2022 at 8:05 am #483903
      Jessica Lewis
      Participant

      If you were to assess the full passive range of motion of a neonate’s hips, the external rotation would be 90 degree or greater. The resting posture of the hip within the joint is ~30 degrees of external rotation due to anteversion (60 degrees) being greater than antetorsion (30 degrees) at birth. The 100 degrees of external rotation is related to PROM of the hip joint and the 30 degrees of external rotation is related to the position of the head of the femur in the acetabulum.

    • February 12, 2022 at 4:31 pm #484065
      Heidi Lee
      Participant

      Ok, thank you so much. This makes sense!

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