Most of us have experienced the stiffness and awkwardness of movement when learning a novel task. Essentially, efficiency of movement is the desired outcome of any movement strategy, whereby muscles are considered as a series of slings acting across joints with differing movement functions. Sometimes these are referred to as 'neuromuscular vectors'. The clinician needs to be aware of Newton's third law of 'action-reaction', the effects of inverse dynamics and the desire for symmetrical and appropriately timed force dissipation ('damping' and 'propagation') by supporting musculature. However, when considering low back pain and pelvic girdle dysfunction, the effects of muscular force transduction are becoming more evident as being an important impairment variable. Traditionally, manual therapists have viewed impairment as loss of range of motion and/or perceived stiffness on joint mobilization. However, clinically there appears to be very little non-specific about such problems. It is true that low back pain can have it's etiology in pelvic girdle mal-alignment, and similarly low back pain with neural irritation can lead to inco-ordination of muscles causing pelvic mal-alignment. Consequently, a misconception that any exercise is good exercise was created. Pelvic girdle and low back pain have fallen under the diagnostic umbrella of non-specific low back pain (NSLBP).
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