When we lift a weight from the floor, leaning forward (with a drop of the spine), we make a significant commitment of the posterior spinal muscles that are equal and clearly overcome the resistance represented by the weight of the body bent forward and weight lifted.
It thus produces a very high muscle tension, which in turn becomes a compressive force on the disk-vertebra complex. The structure of the column that has proven to be more sensitive to these compressive forces is the intervertebral disc.
These compressive forces may lead to a healthier disc cracking in the fibers of the fibrous annulus, which migrates into the part of the gelatinous substance that make up the nucleus pulposus. ( Bulgin disc protrusion or disc )
The drawing is clearly seen as the column bends forward to allow the lifting of weight from the floor. (Figure A ).
Figure B is graphically represented the moment of maximum compression on the intervertebral disc that occurs when we are lifting the weight.
C While the figure is clearly seen as the high compression, which occurs when the weight is lifted completely, produce a migration of the nucleus pulposus into the spinal canal, giving rise to ' disc herniation .
The herniated disc can compress the nerve to go out of the bone marrow giving rise to a very specific set of symptoms: the sciatic
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