Flexion-extension rhythm in the lumbosacral spine

Ruey Mo Lin, Chih Yin Yu, Zeu Jen Chang, Fong Chin Su

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Study Design and Objectives. This study was conducted to depict the qualitative and quantitative changes of intervertebral rotation and translation from L1-L2 to L5-51 during flexion, standing, and extension using dynamic lumbosacral radiographs. Methods, A radiopaque ruler was placed on the back of each subject for the normalization of translational value. Eighty-nine- volunteers were examined, Results. From extension to flexion, all of the intervertebral rotations approached 0˚ from the lordotic position; the translations changed from slightly retrolisthetic to zero displacement. Using L3-L4 as a baseline for calculating the intervertebral differences in flexion, air of the rotational differences were less than 1.5˚ except at L5-S1, which remained 5. The mean translational differences was less than 0.5 mm, except at L5-S1, where it remained 1.5 mm. Conclusion. The amount of total flexibility was level-dependent and its frequency distribution is important. Qualitative values changes front extension to flexion and quantitative values of intervertebral differences in flexion help define the normal flexibility more accurately.

Original languageEnglish
Pages (from-to)2204-2209
Number of pages6
Issue number19
Publication statusPublished - 1994 Oct

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Clinical Neurology


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