Abstract
Purpose: Healthy subjects performed lumbar flexion and were assessed by video fluoroscopy to measure the in vivo kinematics of the lower lumbar motion segments. Methods: Fifteen healthy subjects (8 male, 7 female, 28 ± 10 years) performed lumbar flexion and extension back to neutral while their vertebrae were imaged. The sagittal plane vertebral margins of L3-S1 were identified. Lumbar angle, segmental margin strains, axial displacements, anterior-posterior (A-P) translations, and segmental rotations over the course of flexion were measured. Results: L4-L5 had the largest posterior margin Green strain (65 %). Each segment displayed more axial displacement than A-P translation. Peak vertebral angulation occurred at approximately 75 % of peak flexion during the extension phase. Conclusion: L4-L5 exhibited the largest anterior and posterior margin strains (29 and 65 %, respectively). Strains in the disc during in vivo lumbar flexion are due to both angular rotation and linear translation.
Original language | English (US) |
---|---|
Pages (from-to) | 754-761 |
Number of pages | 8 |
Journal | European Spine Journal |
Volume | 23 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2014 |
Keywords
- Biomechanics
- Intervertebral disc
- Lumbar spine
- Motion segment
- Spine kinematics