The posterior layer of the thoracolumbar fascia is the primary tendinous structure of the lumbar back, formed by the aponeuroses of latissimus dorsi, gluteus maximus, and the erector spinae. It encases the erector spinae and multifidus and acts as a force transducer linking the upper and lower limbs across the posterior trunk. Load transfer through this structure is critical for lumbopelvic stability during lifting and locomotion.
Thoracolumbar fascia dysfunction is implicated in chronic non-specific low back pain. Densification and restricted sliding between fascial layers reduces force transmission and alters motor patterns. Fascial manipulation and deep massage techniques targeting the posterior layer are increasingly evidence-based. Surgical release is occasionally required in post-operative fibrosis.
Disruption of fascial continuity from excessive torsional load, producing diffuse posterior lumbar pain that worsens with trunk rotation and is poorly localised by the patient.
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