THE “PENDULUM LAW” - HOW TO EXPLAIN THE COLUMN SHAPE BASED ON COMMON ANOMALIES? PART II

ABSTRACT In Part I, the author defines an organizational law of the body schema: the “pendulum law”, describing an ideal biomechanical structure of the spine. Thus, he shows how the common variations and anomalies, whether isolated or associated, modify the standard biomechanical scheme. The variations of isolated “curl/roll up” of the sacrum. Anomalies of the lumbosacral joint in the sagittal (LSS) and/or rotational (LSR) plan. Anomalies of stabilization of the capsule of the hip joint and the sacro-diaphyseal angle. Specific anomalies with grade 1 spondylolysis (SL). Segmental anomalies of the vertebral discs in flexion (Rx). Associated anomalies (SL + Rx + ASL= Rx). The interest of studying the impact on the vertical construction of the vertebral column, according to the “ideal” scheme is to establish the physiological limits of this gravitational law, to identify the anomalies, to classify schemes and types, and the biomechanical degenerative consequences.