The effect of scoliotic deformity on spine kinematics in adolescents

Galvis, Sarah; Burton, Douglas C.; Barnds, Brandon; Anderson, John T.; Schwend, Richard M.; Price, Nigel; Wilson, Sara E.; Friis, Elizabeth A.

doi:10.1186/s13013-016-0103-x

Cited by 8 publications

(4 citation statements)

References 16 publications

(14 reference statements)

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“…However, the major limitation of the study is that we cannot account for the possibility that spinal curves themselves could reduce the overall length of spine or mechanical impair spinal flexibility, which both may affect the ability to palm the floor. While previous studies have shown the spine is more flexible in mild scoliosis [24], spines with larger curve angle and apical vertebral rotation show less flexibility, at least on supine brending films[25]. It remains unknown whether the reduced flexibility of severe curves is itself present prior to curve progression are is a secondary consequence of mechanical changes due to the scoliosis.…”

Section: Discussionmentioning

confidence: 99%

Lack of joint hypermobility increases the risk of surgery in adolescent idiopathic scoliosis

Haller¹,

Zabriskie²,

Spehar³

et al. 2018

Journal of Pediatric Orthopaedics B

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Generalized joint hypermobility (GJH) is a risk factor for developing adolescent idiopathic scoliosis (AIS); however, it is not known whether joint hypermobility influences the risk of progression to surgery. Beighton joint hypermobility scores were assessed in 570 female AIS patients. Multivariate analysis was carried out to determine whether Beighton hypermobility scores were predictors of surgical intervention. In this female AIS cohort, 24.7% (141/570) had GJH (Beighton score ≥4). Multivariate analysis showed that GJH did not influence the risk of surgery, although having no joint hypermobility (Beighton score=0) increased risk (odds ratio: 1.89; P=0.003). Females who had no hypermobility (score=0) had significantly larger curves than individuals who scored at least one point on the Beighton scale [50° (interquartile range: 26) vs. 42° (interquartile range: 24), P=0.001]. Evaluation of specific measures of joint hypermobility indicated that females who could not touch their palms to the floor were 2.1-fold more likely to have surgery than patients who could perform this task (P=0.001). None of the other features measured on the Beighton score correlated with surgical risk. The lack of joint hypermobility increases the odds of surgery in females with AIS. Specifically, inability to touch the palms to the floor is an indicator of progression to surgery.

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Section: Discussionmentioning

confidence: 99%

Lack of joint hypermobility increases the risk of surgery in adolescent idiopathic scoliosis

Haller¹,

Zabriskie²,

Spehar³

et al. 2018

Journal of Pediatric Orthopaedics B

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“…The results of both approaches reflected deviations from the straight posture with increased curvature values, but the radius of curvature approach (k o ) was more heavily influenced by segment length. Additionally, the vector approach (k b ) is more like outcome measures already used in clinical applications, such as joint rotations and spine curvature [21][22][23]. Therefore, the vector approach was deemed more appropriate in translation to clinical devices.…”

Section: Kinematic Discussionmentioning

confidence: 99%

3D octopus kinematics of complex postures: Translation to long, thin, soft devices and their potential for clinical use

Weidig,

Bush,

Jimenez

et al. 2024

PLoS ONE

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Intro/Background Octopuses are capable of complex arm movements. Unfortunately, experimental barriers and lack of a robust analysis method made it difficult to quantify the three-dimensional (3D) kinematics of soft, flexible bodies, such as the octopus arm. This information is not only crucial for understanding the posture of the animal’s arm but also for the development of similarly designed soft, flexible devices. Obj/Goal The primary goal of this work was to create a method to comprehensively quantify complex, 3D postures of octopus (Octopus Bimaculoides) arms in a manner that is conducive and translatable to octopus arm-inspired devices for health monitoring and rehabilitation. Methods In this study, 3D underwater motion capture was used to collect kinematic data on both live octopuses and disembodied arms that still had neural activity. A new method was developed to define how arm curvature and regional segments were oriented relative to each other in 3D. This included identification of the bend within a segment along with the computation of the relative orientation between segments, thus permitting the complete quantification of complex arm motions. Results By comparing vector-based and radius of curvature-based approaches to magnitude of curvature, it was clear that the vector-based approach was less dependent on the length of a segment and that its reported ranges of motion were translatable for outcome measures associated with clinical use. The new approach for the relative orientation of each segment of the octopus arm resulted in the capability of describing the octopus arm in many unique postures, such as straight, simple bending, and complex bending as it utilized the three rotational angles. Outcome/Impact This method and its application to octopus arms will yield new information that can be used to better communicate and track not only octopus arm movements but in the development of complex, segmented, soft-bodied devices that can be used in health monitoring and rehabilitation.

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“…For instance, LBP accounts for ~40% of lost workdays with an estimated direct healthcare expenditure of $50–90 billion annually in the US (Guo et al, 1999 ; Yang et al, 2016 ). Many spinal disorders, including idiopathic back pain, degenerative disc disease, lumbar spinal stenosis, vertebral fractures (traumatic or osteoporotic), spine deformity, and muscle imbalance (e.g., myopathy, muscle dystrophy), can alter the kinematics and posture of the trunk (Al-Eisa et al, 2006 ; Briggs et al, 2007 ; Mahaudens et al, 2009 ; Galvis et al, 2016 ; Kuwahara et al, 2016 ; Schmid et al, 2016 ; Basques et al, 2017 ; Christe et al, 2017 ; Chun et al, 2017 ; Crawford et al, 2018 ; Igawa et al, 2018 ). Therefore, objective measurements of trunk kinematics and posture are useful in evaluating the functional impacts of spinal disorders and the development of novel clinical treatments.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Kinematic Constraints on Model Performance During Inverse Kinematics Analysis of the Thoracolumbar Spine

Alemi

Burkhart

Lynch

et al. 2021

Front. Bioeng. Biotechnol.

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Motion analysis is increasingly applied to spine musculoskeletal models using kinematic constraints to estimate individual intervertebral joint movements, which cannot be directly measured from the skin surface markers. Traditionally, kinematic constraints have allowed a single spinal degree of freedom (DOF) in each direction, and there has been little examination of how different kinematic constraints affect evaluations of spine motion. Thus, the objective of this study was to evaluate the performance of different kinematic constraints for inverse kinematics analysis. We collected motion analysis marker data in seven healthy participants (4F, 3M, aged 27–67) during flexion–extension, lateral bending, and axial rotation tasks. Inverse kinematics analyses were performed on subject-specific models with 17 thoracolumbar joints allowing 51 rotational DOF (51DOF) and corresponding models including seven sets of kinematic constraints that limited spine motion from 3 to 9DOF. Outcomes included: (1) root mean square (RMS) error of spine markers (measured vs. model); (2) lag-one autocorrelation coefficients to assess smoothness of angular motions; (3) maximum range of motion (ROM) of intervertebral joints in three directions of motion (FE, LB, AR) to assess whether they are physiologically reasonable; and (4) segmental spine angles in static ROM trials. We found that RMS error of spine markers was higher with constraints than without (p < 0.0001) but did not notably improve kinematic constraints above 6DOF. Compared to segmental angles calculated directly from spine markers, models with kinematic constraints had moderate to good intraclass correlation coefficients (ICCs) for flexion–extension and lateral bending, though weak to moderate ICCs for axial rotation. Adding more DOF to kinematic constraints did not improve performance in matching segmental angles. Kinematic constraints with 4–6DOF produced similar levels of smoothness across all tasks and generally improved smoothness compared to 9DOF or unconstrained (51DOF) models. Our results also revealed that the maximum joint ROMs predicted using 4–6DOF constraints were largely within physiologically acceptable ranges throughout the spine and in all directions of motions. We conclude that a kinematic constraint with 5DOF can produce smooth spine motions with physiologically reasonable joint ROMs and relatively low marker error.

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The effect of scoliotic deformity on spine kinematics in adolescents

Cited by 8 publications

References 16 publications

Lack of joint hypermobility increases the risk of surgery in adolescent idiopathic scoliosis

Lack of joint hypermobility increases the risk of surgery in adolescent idiopathic scoliosis

3D octopus kinematics of complex postures: Translation to long, thin, soft devices and their potential for clinical use

The Influence of Kinematic Constraints on Model Performance During Inverse Kinematics Analysis of the Thoracolumbar Spine

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