It is interesting to think about our arborial past-

  1. The sole articular attachment of the upper extremity to the axial spine is the sternoclavicular joint. When swinging by one arm, the sternum and rib age is pulled up, expanding the thoracic A-P diameter, increasing piston size.
  2. The latissimus dorsi connects the pelvis and lower extremities Directly to the upper extremity at the humerous, not the glenoid or coracoid, bypassing the rib cage to transfer hanging weight directly from the lower half of the body to the upper extremity. This is probably one of the most under used functional capacities in modern life.

Query with regard to McKensie’s theory:

If lordosis causes nucleus pulposis to move anterior, why is it that Herniated Nucleus Pulposis associated with lordosis occurs posteriorly?