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L3 role

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L3 Muscles

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B) Below L3 :

1. We already spoke about sacral and iliac beams starting from L3 processes.
2. The sacral and lombo-iliac ligaments which moor the L4 and L5 processes to iliac bone and sacrum.These ligaments limit especially the side inflection.

These two elements though significant are insufficient to explain low lumbar kyphosis necessary to the dynamics of the human body. We should integrate the concept of basin retroversion.

PELVIC RETROVERSION : there are two kinds of retroversion but are both characterized by a sacral verticalisation.

I find tempting the terminology of certain sport trainers or certain teachers in deportment.They distinguish the bascule with soft and low buttocks and the bascule with high and hard buttocks.

• Bascule with a soft and low buttocks :
  It is characterized by a total axial rotation around coxo-femoral article, with sacral lowering and total lumbar kyphosis.
  It makes take part the ischio-leg muscles (long head femoral biceps, semimembranous, semi tendinous ) which draw the ischium downwards and often, unfortunately, the right of the abdomen which draws the pubis upwards.

In this precise case the distance sternum-pubis is decreased with for corollary a diaphragmatic blocking and a discomfort for the trunk erection, factor of pubalgies, contractures or muscle strains (abdominal,ischio-leg ).
This adynamic bascule preserves the dynamics of the lower limbs when one prevents rectifying oneself and especially when one avoids serving of abdominals muscles ( skier taking the "egg position"or gardener working hunched back a long time for example ).

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