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Lumbar Facet Joint Kinematics and Load Effects During Dynamic Lifting
Suman K Chowdhury1,1, Ryan M Byrne2,1, Yu Zhou1
1Texas A&M University, College Station, USA.
Human Factors
|August 4, 2018
Summary
Lifting heavier loads significantly alters lumbar facet joint motion and orientation in healthy individuals. These biomechanical changes during lifting may contribute to low back pain (LBP).
Area of Science:
- Biomechanics
- Spinal Kinematics
- Occupational Health
Background:
- Low back pain (LBP) is a prevalent issue linked to workplace load handling.
- The specific biomechanics of lumbar facet joints during lifting remain poorly understood.
Purpose of the Study:
- To investigate lumbar facet joint kinematics in vivo during dynamic lifting.
- To determine the impact of varying lifted load magnitudes on these joint movements.
Main Methods:
- Dynamic stereo-radiography captured lumbar motion in 11 healthy participants during a load-lifting task.
- Loads of 4.5 kg, 9.0 kg, and 13.5 kg were tested at multiple trunk flexion angles (0-60°).
- Facet joint orientations were also analyzed.
Main Results:
- Lifted load significantly affected facet joint flexion, lateral bending, and superior-inferior translation.
- The L5-S1 joint exhibited greater lateral bending and twisting due to its orientation.
- Asymmetry in facet joint orientation was noted, particularly at L3-L4 and L5-S1.
Conclusions:
- Lumbar facet joint kinematics are influenced by the weight of lifted loads and facet orientation.
- Altered facet joint motion during demanding functional tasks may be a key, overlooked factor in LBP causation.
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