PEC Pattern
Definition
The Posterior Exterior Chain pattern represents a bilateral extension pattern where both sides of the body are in a position of overextension. Both pelves are anteriorly tilted, both rib cages are flared, and the individual cannot access flexion or internal rotation on either side. It is the most restricted and compensated of the structural patterns.
Clinical Significance
The PEC pattern is the most challenging structural presentation because the individual has lost the ability to access normal movement variability. They are locked into extension. This creates bilateral restrictions, bilateral pain patterns, and an inability to achieve positions of flexion (like a deep squat or full cervical flexion). It often develops from years of unaddressed Left AIC/Right BC compensation.
How AKMI Assesses This
AKMI identifies the PEC pattern through bilateral assessment showing restriction in both hip internal rotation, both shoulder internal rotation, bilateral rib flare, and loss of thoracic flexion. The pattern is confirmed when the individual cannot achieve repositioning on either side through standard interventions.
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