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Lumbar lordosis: normal adults.

R M Lin1, I M Jou, C Y Yu

  • 1Department of Orthopedics, College of Medicine, National Cheng Kung University, Tainan, Taiwan, R.O.C.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|March 1, 1992
PubMed
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Lumbar lordotic angle (LLA) is a key measure for spinal health. Normal LLA values range from 20-45 degrees, showing significant increases with age, particularly after 60.

Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • Lumbar curvature assessment is crucial for spinal health evaluation.
  • Understanding normal ranges and age-related changes in lumbar angles is essential for clinical diagnosis.

Purpose of the Study:

  • To investigate lumbar curvatures in a general adult population.
  • To establish normal values for lumbar lordotic angle (LLA), lumbosacral angle (LSA), and sacral inclination angle (SIA).
  • To analyze correlations between these angles and their variations across age and sex.

Main Methods:

  • Radiographic analysis of lumbar curvatures in 149 healthy adults (76 males, 73 females, average age 50).
  • Measurement of LLA, LSA, and SIA, with statistical analysis for correlations and group differences.

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  • Comparison of angles between sexes, age groups, and spinal conditions (spondylotic vs. normal).

    • Main Results:

    • Mean LLA: 33.2±12.1°, LSA: 11.4±4.7°, SIA: 26.4±10°.
    • High correlation found between LLA and SIA (r=0.883, p=0.0001).
    • LLA increased with age, with significant differences noted between younger (<35) and older (>60) adults, and within the 35-60 and >60 age groups (p=0.0056).
    • No significant sex-based differences or differences in spondylotic vs. normal spines were observed for these angles.

    Conclusions:

    • LLA is a reliable parameter for evaluating lumbar lordosis, with normal values typically between 20-45 degrees.
    • Lumbar lordosis naturally increases with age, indicating potential age-related spinal changes.
    • The study provides normative data for lumbar angles, valuable for diagnosing spinal conditions.