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Defining "Normal" Static and Dynamic Spinopelvic Characteristics: A Cross-Sectional Study.

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Spinopelvic characteristics change with age, affecting lumbar and hip flexion. As people age, the lumbar spine's contribution to movement decreases, increasing the hip's relative role.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Gerontology

Background:

  • Spinopelvic characteristics are crucial for hip biomechanics.
  • Understanding "normal" spinopelvic parameters across demographics is limited.
  • Age, sex, and BMI are potential factors influencing these characteristics.

Purpose of the Study:

  • To investigate age, sex, and BMI effects on static and dynamic spinopelvic characteristics.
  • To quantify changes in lumbar flexion, hip flexion, and pelvic tilt.
  • To determine the hip user index in well-functioning volunteers.

Main Methods:

  • Cross-sectional cohort study of 112 asymptomatic volunteers.
  • Lateral spinopelvic radiography in standing and deep-seated positions.
  • Calculation of lumbar flexion (∆LL), hip flexion (∆PFA), pelvic tilt (ΔPT), and hip user index.

Main Results:

  • Lumbar flexion decreased by 4.5°/decade and hip flexion by 3.6°/decade with age.
  • Younger age, low standing PFA, and high standing LL predicted greater lumbar flexion.
  • Men showed a trend towards less hip flexion and a lower hip user index compared to women.
  • Body Mass Index (BMI) showed weak correlations with lumbar and hip flexion.

Conclusions:

  • Spinopelvic characteristics are dependent on age, sex, and BMI.
  • Aging leads to greater lumbar spine changes than hip changes, increasing the hip's relative contribution to movement.
  • Men exhibit greater pelvic tilt changes due to reduced hip flexion compared to women.
  • BMI has a minimal influence on spinopelvic parameters.