Published online by Cambridge University Press: 05 February 2014
Introduction
Chronic low-back pain is one of the leading causes of physician office visits and work absenteeism in developed countries. It is estimated that from 49% to 70% of the adult population will suffer at least one episode of low-back pain over their lifetime (Koes et al., 2006).
Although the etiopathogenesis of non-specific low-back pain is unknown, multiple factors may be involved in pain occurrence. Involvement of the muscles directly or indirectly stabilizing the lumbar spine may play a significant role in the occurrence and maintenance of low-back pain syndromes (Porterfield and DeRosa, 1998).
This chapter reviews the pathophysiology, diagnosis and treatment with botulinum neurotoxin (BoNT) of myofascial pain of muscles involved in lumbosciatic conditions (quadratus lumborum, iliopsoas and paravertebral) (Table 29.1). The piriformis muscle is reviewed in the next chapter.
Quadratus lumborum muscle
Dysfunction of the quadratus lumborum muscle is considered the most common cause of low-back pain by many authors (Travell and Simmons, 1983). Its impairment may be severely disabling as it plays an important stabilizing role in the spine, and makes the load of standing body weight intolerable.
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