Related Experiment Video
Updated: Apr 23, 2026
Lateral-PLIF for Lumbar Spinal Arthrodesis: A Detailed Step-By-Step Surgical Technique
Published on: January 23, 2026
Effect of lordosis angle change after lumbar/lumbosacral fusion on sacrum angular displacement: a finite element
Ningfang Mao1, Jian Shi, Dawei He
1Orthopedic Department of Changhai Hospital, 168 Changhai Road, Shanghai, 200433, People's Republic of China.
Purpose:
To assess and characterize the sacrum angular displacements in response to lumbar lordosis after lumbar/lumbosacral fusion.
Methods:
A finite element model of the lower lumbar spine-pelvis was established and used to simulate the posterior fusion at L3-L5 and L4-S1. The lordosis angle in the fusion segments was set to five different conditions with respect to the intact model: 10° less than intact, 5° less than intact, same as intact, 5° more than intact, and 10° more than intact. Variations of the sacrum angular displacements with lordosis changes were analyzed under loading setting of axial compression, flexion, extension, lateral bending, and axial rotation.
Results:
Compared with the intact lordosis, both increased and decreased lumbar lordosis angles caused the sacrum angular displacements to be increased. The lordosis angle increased by 10° induced the most substantial increase in sacrum angular displacements. In addition, the sacrum angular displacements of the L4-S1 fusion model at different lordosis angles were higher than those of the L3-L5 fusion model.
Conclusion:
The sacrum angular displacements occur as a result of the fusion surgery (L4-S1) and the changes in lumbar lordosis.
More Related Videos
07:44Evaluation of Patients' Posture and Gait Profile After Lumbar Fusion Surgery by Video Rasterstereography and Treadmill Gait Analysis
Published on: March 23, 2019
11:30Multilevel Oblique Lumbar Interbody Fusion in Degenerative Lumbar Disc Disease with Instability
Published on: July 25, 2025