The back normally moves into extension and side bending when walking. Usually, the movement is automatically controlled close to zone 1 and zone 2.
With pain and/or reduced movement control, the degree of movement may increase to one or both sides.
Increased movement with lack of control may provide an ongoing source of irritation if the movement reaches and extends into areas of impairment.
eg. a weak and painful hip may make it difficult to control a level pelvis.
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With a significant impairment into extension, walking may become painful.