The effect of lifting load on the kinematic characteristics of lumbar spinous process in vivo

Abstract

Background There are limited data on the in vivo natural kinematics of the lumbar spinous process. This paper intends to explore the effect of lifting load on the in vivo movement mode of the lumbar spinous process and its biomechanical changes. Methods Ten asymptomatic subjects between the ages of 25 and 39 underwent CT scans of the lumbar spine in the supine position, and 3D models of L3-L5 were constructed. Using a Dual Fluoroscopy Imaging System (DFIS), instantaneous orthogonal fluoroscopic images of each subject's flexion–extension, left–right bending, and left–right rotational movements were taken under different loads (0 kg, 5 kg, 10 kg). The supine CT model was matched, using computer software, to the bony contours of the images from the two orthogonal views, so that the instantaneous 3D vertebral position at each location could be quantified. A Cartesian coordinate system was ultimately constructed at the tip of the spinous process to obtain the 6DOF kinematic data of the spinous process. Results In different postural movements of the trunk, there was no significant difference in the rotation angle and translation range of the lumbar spinous process under different loads (P > 0.05). In flexion to extension motion, spinous processes mainly rotate < 4° along the medial and lateral axes and translate < 4 mm along the craniocaudal direction. In the left–right bending motion, spinous processes mainly rotate < 5° along the anterior and posterior axes, and the translation is mainly coupling < 2 mm. In the rotational motion, the spinous process is mainly coupled motion, the rotation range is less than 3°, and the translation range is less than 2 mm. The distance between spinous processes measured in the supine position was 6.66 ± 2.29 mm at L3/4 and 5.08 ± 1.57 mm at L4/5. Conclusion The in vivo kinematics of the lumbar spinous process will not change significantly with increasing low load. In complex motion, the spinous process is dominated by coupling motion.

A study on the relative motion trajectory of lumbar pedicles under physiological loads in vivo

“…Recently, there have been reports on the in vivo kinematics of the lumbar spine, including the characteristics of intervertebral disc motion and deformation [14], the range of motion of the lumbar small joints [9], and the characteristics of inter spinous process motion [10]. These studies not only led to the study of in vivo kinematics of the lumbar spine but also set the framework for the method by which in vivo kinematics data of the lumbar spine can be obtained under physiological loads to ultimately provide reference data for explaining the occurrence, development, and changes in lumbar degenerative diseases, as well as guiding treatment (especially nonfusion treatment).…”

“…3). Thus, under current physiological load conditions, accurate movement of the lumbar spine is affected at various positions in the human body [8][9][10].…”

Design Strategy for Water/Temperature-Resistant Acrylic-Based Adhesives with Green Recall

“…Some similar small structural designs in biology achieve significant performance improvements, such as the spinous and transverse processes of vertebrates (Figure a). Although there is a lack of systematic conclusions, relevant medical research seems to suggest that they play a crucial role in maintaining the strength and stability of the spine. , Inspired by this, we propose a minimalist strategy, α-methylation, to improve the stability of acrylic-based adhesives in humid and hot environments (Figure b). Here, we adopted the method of copolymerization of methylated methacrylic acid (MAc) and 2-methoxyethyl methacrylate (MEMA).…”