Changes in the global spine alignment in the sitting position in an automobile

Nishida, Norihiro; Izumiyama, Tomohiro; Asahi, Ryusuke; Iwanaga, Hideyuki; Yamagata, Hiroki; Mihara, Atsushi; Nakashima, Daisuke; Imajo, Yasuaki; Suzuki, Hitomi; Funaba, Masahiro; Sugimoto, Shigeru; Fukushima, Masanobu; Sakai, Takashi

doi:10.1016/j.spinee.2019.11.016

Cited by 22 publications

(24 citation statements)

References 22 publications

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“…In a previous study, for asymptomatic subjects, it was demonstrated that age significantly affected the change in LL when the position was changed from standing to sitting. With increased age, the reduction in LL was smaller [11,17]. In this study, we also found that with increased age, ΔLL and ΔURL were both smaller after lumbar fusion.…”

Section: Discussionsupporting

confidence: 71%

Differences in standing and sitting spinopelvic sagittal alignment for patients with posterior lumbar fusion: important considerations for the changes of unfused adjacent segments lordosis

Sun

Zhou

Wang

et al. 2020

BMC Musculoskelet Disord

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Objective This study aimed to describe the changes in spinopelvic sagittal alignment in the sitting position after posterior lumbar fusion, and to identify the factors influencing unfused adjacent segment lordosis. Methods Consecutive patients with lumbar degenerative disease who underwent posterior lumbar interbody fusion between December 2010 and April 2012 were recruited. Lateral full spine radiographs were obtained in the standing, erect sitting, and natural sitting positions. Spinopelvic parameters were measured preoperatively and at the final follow-up. Results The data of 63 patients were analyzed in this study. The average age was 61.6 ± 11.0 years. When changing from standing to sitting at the final follow-up, all spinopelvic sagittal parameters with the exceptions of pelvic incidence and thoracic kyphosis were significantly altered. The most noticeable changes occurred in the natural sitting position, with the spine slumped toward achieving a C-shaped sagittal profile. Multiple linear regression analysis revealed that when changing to a natural sitting position, age and fusion levels reflected the changes in lumbar lordosis (ΔLL), age and lumbosacral fusion reflected the changes in upper residual lordosis (ΔURL). Conclusion The most noticeable changes in spinopelvic sagittal alignment occurred in the natural sitting position after lumbar fusion. Age, fusion levels, and lumbosacral fusion significantly influenced the differences in LL and URL between the standing and natural sitting position. These characteristics should be fully considered when planning spinal realignment surgery and investigating the etiological factors of junctional complications.

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Section: Discussionsupporting

confidence: 71%

Differences in standing and sitting spinopelvic sagittal alignment for patients with posterior lumbar fusion: important considerations for the changes of unfused adjacent segments lordosis

Sun

Zhou

Wang

et al. 2020

BMC Musculoskelet Disord

View full text Add to dashboard Cite

show abstract

“…In a previous study, for asymptomatic subjects, it was demonstrated that age signi cantly affected the change in LL when the position was changed from standing to sitting. With increased age, the reduction in LL was smaller 11,17 . In this study, we also found that with increased age, ΔLL and ΔURL were both smaller after lumbar fusion.…”

Section: Discussionmentioning

confidence: 94%

Differences in Standing and Sitting Spinopelvic Sagittal Alignment for Patients with Posterior Lumbar Fusion: Important Considerations for the Changes of Unfused Adjacent Segments Lordosis

Sun

Zhou

Wang

et al. 2020

Preprint

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Objective: This study aimed to describe the changes in spinopelvic sagittal alignment in the sitting position after posterior lumbar fusion, and to identify the factors influencing unfused adjacent segment lordosis.Methods: Consecutive patients with lumbar degenerative disease who underwent posterior lumbar interbody fusion between December 2010 and April 2012 were recruited. Lateral full spine radiographs were obtained in the standing, erect sitting, and natural sitting positions. Spinopelvic parameters were measured preoperatively and at the final follow-up. Results: The data of 63 patients were analyzed in this study. The average age was 61.6±11.0 years. When changing from standing to sitting at the final follow-up, all spinopelvic sagittal parameters with the exceptions of pelvic incidence and thoracic kyphosis were significantly altered. The most noticeable changes occurred in the natural sitting position, with the spine slumped toward achieving a C-shaped sagittal profile. Multiple linear regression analysis revealed that when changing to a natural sitting position, age and fusion levels reflected the changes in lumbar lordosis (ΔLL), age and lumbosacral fusion reflected the changes in upper residual lordosis (ΔURL). Conclusion: The most noticeable changes in spinopelvic sagittal alignment occurred in the natural sitting position after lumbar fusion. Age, fusion levels, and lumbosacral fusion significantly influenced the differences in LL and URL between the standing and natural sitting position. These characteristics should be fully considered when planning spinal realignment surgery and investigating the etiological factors of junctional complications.

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“…Lee et al reported that lumbar spine lordosis and pelvic tilt were decreased when study participants were sitting [ 14 ]. Nishida et al reported that body alignment changes with the car seat [ 17 ]. However, there were no reports examining the effects of lumbar spine or pelvic alignment in the analysis of car accidents.…”

Section: Discussionmentioning

confidence: 99%

“…To make the analysis more thorough, we considered the possibility that the occupant's seating alignment was also involved. As a basis for this hypothesis, it is well known that changing from a standing to a sitting position causes changes in lumbar and pelvic alignment [10][11][12][13][14][15][16][17]. Individual differences in skeletal and seated alignment may explain why simulations do not fully replicate accidents.…”

Section: Introductionmentioning

confidence: 99%

Analysis of individual differences in pelvic and spine alignment in seated posture and impact on the seatbelt kinematics using human body model

et al. 2021

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Analysis using human body models has been performed to reduce the impact of accidents; however, no analysis has shown a relationship between lumbar and pelvic/spine angle and seat belts in reducing human damage from accidents. Lumbar and pelvic/spine angles were measured in 75 individuals and the measurements were used to create three different angles for the Total Human Model for Safety model. In the present study, we focused on lumber lordosis (LL) and pelvic angle (PA). A normal distribution and histogram were used for analysis of PA (01, 10, and 50). The Total Human Model for Safety, including LL and PA, was corrected using finite element software. Simulations were conducted under the conditions of the Japan New Car Assessment Programme (JNCAP) 56 kph full lap frontal impact. Using the results of the FEM, the amount of lap-belt cranial sliding-up, anterior movement of the pelvis, posterior tilt of the pelvis, head injury criterion (HIC), second cervical vertebrae (C2) compressive load, C2 moment, chest deflectiou (upper, middle, and lower), left and right femur load, and shoulder belt force were measured. The lap-belt cranial sliding-up was 1.91 and 2.37 for PA10 and PA01, respectively, compared to PA50; the anterior movement of the pelvis was 1.08 and 1.12 for PA10 and PA01, respectively; and the posterior tilt of the pelvis was 1.1 and 1.18 for PA10 and PA01, respectively. HIC was 1.13 for PA10 and 1.58 for PA01; there was no difference in C2 compressive load by PA, but C2 moment increased to 1.59 for PA10 and 2.72 for PA01. It was found that as LL increases and the PA decreases, the seat belt becomes likely to catch the iliac bone, making it harder to cause injury. This study could help to reconsider the safe seat and seatbelt position in the future.

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Changes in the global spine alignment in the sitting position in an automobile

Cited by 22 publications

References 22 publications

Differences in standing and sitting spinopelvic sagittal alignment for patients with posterior lumbar fusion: important considerations for the changes of unfused adjacent segments lordosis

Differences in standing and sitting spinopelvic sagittal alignment for patients with posterior lumbar fusion: important considerations for the changes of unfused adjacent segments lordosis

Differences in Standing and Sitting Spinopelvic Sagittal Alignment for Patients with Posterior Lumbar Fusion: Important Considerations for the Changes of Unfused Adjacent Segments Lordosis

Analysis of individual differences in pelvic and spine alignment in seated posture and impact on the seatbelt kinematics using human body model

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