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. 2023 Jul 10;24(1):561.
doi: 10.1186/s12891-023-06698-y.

Influence of weight-bearing on the 3D movement of lumbar facet joints in the sitting position

Ye Han #  1 , Xiaodong Wang #  1 , Jianzhong Wang  1 , Shaosong Sun  1 , Xi Xia  2 , Jing Wang  3 , Jun Miao  4
Affiliations

Influence of weight-bearing on the 3D movement of lumbar facet joints in the sitting position

Ye Han et al. BMC Musculoskelet Disord. .

Abstract

Objective: To analyze the motion characteristics of lumbar facet joints and to observe the effect of weight-bearing on lumbar facet joints in the sitting position.

Methods: Ten normal subjects (5 males and 5 females) were recruited and scanned by CT, and their lumbar 3D models were reconstructed by software. The images of flexion and extension of lumbar facet joints in the sitting position were collected without weight-bearing and weight-bearing 10 kg, and the 2D model was constructed by software. The 2D-3D model was matched to restore the flexion and extension motion changes of the subjects' lumbar spine in the sitting position. Coordinates were established in the middle of the vertebral body and copied to the facet joints. Measure and record the lumbar facet joint movement distance through coordinate system. The relevant data of facet joints were collected.

Results: In the L3/4 segment, after weight loading, the displacement of the left facet joint in the X axis became larger, while that in the Y axis and Z axis decreased. The displacement of the right facet joint in the X axis and Y axis increased, and the Z axis displacement decreased. The rotation angle of the bilateral facet joints also decreased. In the L4/5 segment, after loading, the displacements of the X, Y, and Z axis displacements of both sides increase, while the rotation angles of α and β increase, while the rotation angle of γ decreases. In the L5/S1 segment, the displacements of the X, Y, and Z axes on the left side decrease. The displacement of the X and Y axes on the right side decreases, while the displacement on the Z axis increases. The rotation angles of α and γ increase, and the rotation angle of the β axis decreases.

Conclusion: When sitting, the flexion and extension distance and rotational displacement of lumbar facet joints are not affected by weight-bearing. In addition, there is asymmetry in the movement of the left and right facet joints, and weight bearing has no effect on the asymmetry of the motion.

Keywords: Lumbar facet joints; Lumbar, DFIS; Sitting; Weight-bearing.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
Lumbar vertebra model reconstructed by Mimics 19.0
Fig. 2
Fig. 2
Dual fluoroscopic imaging system: The DFIS system was composed of two mobile X-ray machines placed perpendicular to each other
Fig. 3
Fig. 3
Participant subject sits in a height-adjustable seat and performs maximal flexion and extension movements with wear-bearing 10 kg. (a) Neutral position (b) Flexion (c) Extension
Fig. 4
Fig. 4
Established coordinate system, which establishes coordinates at facet, spinous process and other positions
Fig. 5
Fig. 5
Spine vertebral bodies were adjusted in Rhinoceros software to match the 2D background and 3D model to restore vertebral body position in various postures
See this image and copyright information in PMC

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