Rib Flare
Definition
A postural position where the lower ribs protrude anteriorly and the rib cage sits in external rotation. Visible as prominent lower ribs when lying supine or standing in profile. Indicates loss of the zone of apposition and a wide infrasternal angle. One of the most common and impactful findings in biomechanical assessment.
Clinical Significance
Rib flare is a visible indicator of extension-dominant posture. It compresses the posterior lumbar spine, limits diaphragmatic function, stretches the anterior abdominal wall (reducing core stability), and positions the scapulae in protraction. The correction of rib flare through exhale-based exercises and abdominal wall re-engagement is often the single most effective intervention in the early phase of structural correction.
How AKMI Assesses This
AKMI identifies rib flare through visual assessment in supine, standing, and overhead reaching positions. The infrasternal angle is measured. The ability to voluntarily depress the ribs (exhale fully and maintain rib cage position) is tested. Bilateral comparison determines if flare is symmetric (PEC-like) or asymmetric (AIC-like).
Get your respiratory assessed
A biomechanical assessment measures rib flare and its relationship to the rest of your structural chain. 18 tests, objective data, personalized programming.