Anatomical and biomechanical study of the lumbar interspinous ligament

Joe Iwanaga; Emily Simonds; Emre Yilmaz; Maia Schumacher; Mayank Patel; R Tubbs

doi:10.4103/ajns.AJNS_87_19

Asian Journal of Neurosurgery, Table of Contents

CC BY-NC-ND 4.0 · Asian J Neurosurg 2019; 14(04): 1203-1206
DOI: 10.4103/ajns.AJNS_87_19

Original Article

Anatomical and biomechanical study of the lumbar interspinous ligament

Authors

Joe Iwanaga

¹Seattle Science Foundation, Seattle, WA, USA

²Department of Anatomy, Division of Gross and Clinical Anatomy, Kurume University School of Medicine, Kurume, Japan
Emily Simonds

¹Seattle Science Foundation, Seattle, WA, USA
Emre Yilmaz

¹Seattle Science Foundation, Seattle, WA, USA

³Department of Trauma Surgery, BG University Hospital Bergmannsheil, Ruhr University Bochum, Bochum, Germany
Maia Schumacher

¹Seattle Science Foundation, Seattle, WA, USA
Mayank Patel

¹Seattle Science Foundation, Seattle, WA, USA
R Tubbs

¹Seattle Science Foundation, Seattle, WA, USA

⁴Department of Anatomical Sciences, St. George's University, St. George's, Grenada

Abstract

Objective: The lumbar interspinous ligaments (ISLs) are thin and short fibers connecting adjacent spinous processes. However, their morphology is variably described and their biomechanics are not well understood. Therefore, the purpose of this study was to assess the anatomy and biomechanics of the lumbar ISL. Materials and Methods: Five fresh frozen cadaveric specimens were dissected posteriorly to reveal and study the lumbar ISL. Measurements of the ligaments included the anterior vertical height (length A), the posterior vertical height (length P), and the length (length H) at each lumbar level. Next, 17 lumbar vertebral levels from 6 cadaveric specimens were used for tensile strength testing. The ISLs were subjected to vertically controlled increasing manual tension. The force necessary to disrupt the ISL was recorded. Results: All the ISLs ran horizontally in an anterior–posterior direction with a slight curve. The average of length A, length P, and length H on the right sides was 9.82, 9.57, and 20.12 mm, respectively. The average of length A, length P, and length H on the left sides was 11.56, 12.01, and 21.42 mm, respectively. The mean tensile strength of the ISL was 162.33 (N) at L1/2, 85.67 (N) at L2/3, and 79 (N) at L3/4. There was a significant difference in the tensile force between L1/2 and L2/3 and L1/2 and L3/4 (P < 0.05). The ligaments became weaker with a descent along the lumbar levels. Conclusion: The results of this study might help surgeons understand pathology/trauma of the lumbar vertebral region.

Key-words:

Biomechanics - cadaver - lumbar interspinous ligaments - spine - tensile strength

Full Text

References

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