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Investigation of geometric deformations of the lumbar disc during axial body rotations. BMC Musculoskelet Disord 2022; 23:225. [PMID: 35260128 PMCID: PMC8905741 DOI: 10.1186/s12891-022-05160-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 02/28/2022] [Indexed: 12/03/2022] Open
Abstract
Background Quantitative data on in vivo vertebral disc deformations are critical for enhancing our understanding of spinal pathology and improving the design of surgical materials. This study investigated in vivo lumbar intervertebral disc deformations during axial rotations under different load-bearing conditions. Methods Twelve healthy subjects (7 males and 5 females) between the ages of 25 and 39 were recruited. Using a combination of a dual fluoroscopic imaging system (DFIS) and CT, the images of L3–5 segments scanned by CT were transformed into three-dimensional models, which matched the instantaneous images of the lumbar spine taken by a double fluorescent X-ray system during axial rotations to reproduce motions. Then, the kinematic data of the compression and shear deformations of the lumbar disc and the coupled bending of the vertebral body were obtained. Results Relative to the supine position, the average compression deformation caused by rotation is between + 10% and − 40%, and the shear deformation is between 17 and 50%. Under physiological weightbearing loads, different levels of lumbar discs exhibit similar deformation patterns, and the deformation patterns of left and right rotations are approximately symmetrical. The deformation patterns change significantly under a 10 kg load, with the exception of the L3–4 disc during the right rotation. Conclusion The deformation of the lumbar disc was direction-specific and level-specific during axial rotations and was affected by extra weight. These data can provide new insights into the biomechanics of the lumbar spine and optimize the parameters of artificial lumbar spine devices.
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Fu M, Li Q, Xu Y, Jiang T, Xiong M, Xiao J, Li J, Ouyang J. Variation in spatial distance between the lumbar interlaminar window and intervertebral disc space during flexion-extension. Surg Radiol Anat 2021; 43:1537-1544. [PMID: 34331075 DOI: 10.1007/s00276-021-02809-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2021] [Accepted: 07/26/2021] [Indexed: 11/28/2022]
Abstract
PURPOSE Knowledge of interlaminar space is important for undertaking percutaneous endoscopic discectomy via an interlaminar approach (PED-IL). However, dynamic changes in the lumbar interlaminar space and the spatial relationship between the interlaminar space and intervertebral disc space (IDS) are not clear. The aim of this study was to anatomically clarify the changes in interlaminar space height (ILH) and variation in distance between the two spaces during flexion-extension of the lumbar spine in vitro. METHODS First, we used a validated custom-made loading equipment to obtain neutral, flexion, and extension 3D models of eight lumbar specimens through 3D reconstruction software. Changes in ILH (ILH, IL-yH, IL-zH) and distances between the horizontal plane passing through the lowest edge of the lamina of the superior lumbar vertebrae and the horizontal plane passing through the lowest position of the trailing edge of the same-level IDS (DpLID) at L3/4, L4/5 and L5/S1 were examined on 3D lumbar models. RESULTS We found that ILH was greater at L4/5 than at L3/4 and L5/S1 in the neutral position, but the difference was not significant. In the flexion position, ILH was significantly more than that in neutral and extension positions at L3/4, L4/5, and L5/S1. There were significantly more DpLID changes from neutral to flexion than that from neutral to extension at all levels (L3/4, L4/5, L5/S1). CONCLUSION These findings demonstrated level-specific changes in ILH and DpLID during flexion-extension. The data may provide a better understanding of the spatial relationship between lumbar interlaminar space and IDS, and aid the development of segment-specific treatment for PED-IL.
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Affiliation(s)
- Maoqing Fu
- Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Southern Medical University, Shatai Road, Baiyun District, Guangzhou, 510515, Guangdong, People's Republic of China.,Department of Spine Surgery, The Seventh Affiliated Hospital, Southern Medical University, Nanhai District, Foshan, 528200, Guangdong, China
| | - Qingchu Li
- Department of Orthopedics, The Third Affiliated Hospital, Academy of Orthopedics, Southern Medical University, Tianhe District, Guangzhou, 510630, Guangdong, China
| | - Yafei Xu
- Department of Spine Surgery, The Seventh Affiliated Hospital, Southern Medical University, Nanhai District, Foshan, 528200, Guangdong, China
| | - Tiebin Jiang
- Department of Spine Surgery, The Seventh Affiliated Hospital, Southern Medical University, Nanhai District, Foshan, 528200, Guangdong, China
| | - Minjian Xiong
- Department of Spine Surgery, The Seventh Affiliated Hospital, Southern Medical University, Nanhai District, Foshan, 528200, Guangdong, China
| | - Jujiao Xiao
- Department of Science and Education, The Seventh Affiliated Hospital, Southern Medical University, Nanhai District, Foshan, 528200, Guangdong, China
| | - Jianyi Li
- Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Southern Medical University, Shatai Road, Baiyun District, Guangzhou, 510515, Guangdong, People's Republic of China
| | - Jun Ouyang
- Department of Anatomy, Guangdong Provincial Medical Biomechanical Key Laboratory, Southern Medical University, Shatai Road, Baiyun District, Guangzhou, 510515, Guangdong, People's Republic of China.
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