1
|
Alemi MM, Burkhart KA, Lynch AC, Allaire BT, Mousavi SJ, Zhang C, Bouxsein ML, Anderson DE. The Influence of Kinematic Constraints on Model Performance During Inverse Kinematics Analysis of the Thoracolumbar Spine. Front Bioeng Biotechnol 2021; 9:688041. [PMID: 34395398 PMCID: PMC8358679 DOI: 10.3389/fbioe.2021.688041] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 06/28/2021] [Indexed: 11/18/2022] Open
Abstract
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.
Collapse
Affiliation(s)
- Mohammad Mehdi Alemi
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.,Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States
| | - Katelyn A Burkhart
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.,Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States
| | - Andrew C Lynch
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Brett T Allaire
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States
| | - Seyed Javad Mousavi
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.,Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States
| | - Chaofei Zhang
- Department of Automotive Engineering, Tsinghua University, Beijing, China
| | - Mary L Bouxsein
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.,Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States
| | - Dennis E Anderson
- Center for Advanced Orthopaedic Studies, Beth Israel Deaconess Medical Center, Boston, MA, United States.,Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA, United States
| |
Collapse
|
2
|
Breen A, Mellor F, Morris A, Breen A. An in vivo study exploring correlations between early-to-moderate disc degeneration and flexion mobility in the lumbar spine. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2020; 29:2619-2627. [PMID: 32651632 DOI: 10.1007/s00586-020-06526-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 06/14/2020] [Accepted: 07/01/2020] [Indexed: 10/23/2022]
Abstract
PURPOSE Early disc degeneration (DD) has been thought to be associated with loss of spine stability. However, before this can be understood in relation to back pain, it is necessary to know the relationship between DD and intervertebral motion in people without pain. This study aimed to find out if early-to-moderate DD is associated with intervertebral motion in people without back pain. METHODS Ten pain-free adults, aged 51-71, received recumbent and weight bearing MRI scans and quantitative fluoroscopy (QF) screenings during recumbent and upright lumbar flexion. Forty individual level and 10 composite (L2-S1) radiographic and MRI DD gradings were recorded and correlated with intervertebral flexion ROM, translation, laxity and motion sharing inequality and variability for both positions. RESULTS Kinematic values were similar to previous control studies. DD was evidenced up to moderate levels by both radiographic and MRI grading. Disc height loss correlated slightly, but negatively with flexion during weight bearing flexion (R = - 0.356, p = 0.0.025). Composite MRI DD and T2 signal loss evidenced similar relationships (R = - 0.305, R = - 0.267) but did not reach statistical significance (p = 0.056, p = 0.096). No significant relationships between any other kinematic variables and DD were found. CONCLUSION This study found only small, indefinite associations between early-to-moderate DD and intervertebral motion in healthy controls. Motion sharing in the absence of pain was also not related to early DD, consistent with previous control studies. Further research is needed to investigate these relationships in patients.
Collapse
Affiliation(s)
- Alan Breen
- Faculty of Science and Technology, Bournemouth University, Poole, BH12 5BB, UK.
| | - Fiona Mellor
- Centre for Biomechanics Research, AECC University College, Parkwood Campus, Bournemouth, BH5 2DF, UK
| | - Andrew Morris
- Centre for Biomechanics Research, AECC University College, Parkwood Campus, Bournemouth, BH5 2DF, UK
| | - Alexander Breen
- Centre for Biomechanics Research, AECC University College, Parkwood Campus, Bournemouth, BH5 2DF, UK
| |
Collapse
|
3
|
Chang SW, Bohl MA, Kelly BP, Wade C. The segmental distribution of cervical range of motion: A comparison of ACDF versus TDR-C. J Clin Neurosci 2018; 57:185-193. [DOI: 10.1016/j.jocn.2018.08.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 08/14/2018] [Accepted: 08/21/2018] [Indexed: 11/16/2022]
|