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Rotational mobility of the human back in forward flexion
1Bioengineering Research Group, University of Durham, Science Laboratories, UK.
Journal of Biomedical Engineering
|May 1, 1989
Summary
Human back twisting ability was measured in flexed postures. Increased spinal rotation occurred in flexion, suggesting intervertebral disc vulnerability to torsion during combined movements.
Area of Science:
- Biomechanics
- Spinal Anatomy
- Human Physiology
Background:
- Understanding lumbar spine mobility is crucial for injury prevention.
- Previous research has not fully quantified rotational capacity in flexed postures.
- The intervertebral disc's response to combined loading is not well understood.
Purpose of the Study:
- To measure the human back's twisting ability in flexed postures.
- To investigate lumbar spine mobility using a novel measurement device.
- To assess the potential vulnerability of spinal structures during combined movements.
Main Methods:
- Utilized a new electromagnetic measurement device for precise motion tracking.
- Investigated the mobility of the lumbar spine in 12 healthy male subjects.
- Measured spinal rotation while subjects were in various flexed postures.
Main Results:
- Demonstrated that increased spinal rotation is achievable in flexed postures.
- Quantified the degree of lumbar spine mobility during combined flexion and rotation.
- Observed a correlation between posture and rotational capacity.
Conclusions:
- The human back exhibits enhanced rotational mobility when in a flexed posture.
- This increased rotation suggests potential vulnerability of the intervertebral disc to torsion.
- Combining twisting with sub-maximal sagittal flexion may pose a risk to spinal structures.