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'''Rhombus of Michaelis''' (also known as '''Michaelis' rhombus''', '''quadrilateral of Michaelis''' or '''sacral rhombus''') is a kite-shaped area that includes the three lower lumbar vertebrae, the sacrum and that part of the ilium that is posterior to the acetabulum. It is named after the German gynecologist '''[[Gustav Adolf Michaelis]]''' who first described its importance in childbirth.

== Anatomy ==
The Rhombus of Michaelis is a diamond-shaped area on the lower back of a woman. It is bordered by the '''[[lumbar vertebrae]]''' at the top, the '''[[iliac crests]]''' on the sides, and the '''[[sacrum]]''' at the bottom. The '''[[posterior superior iliac spines]]''' form the lateral points of the rhombus.

== Role in Childbirth ==
During the second stage of labor, the Rhombus of Michaelis increases in size which allows the sacrum to move backwards to increase the diameter of the pelvic outlet. This is crucial for the baby's head to pass through. The movement of the sacrum is facilitated by the woman adopting an upright or forward-leaning position during labor.

== Clinical Significance ==
Understanding the role of the Rhombus of Michaelis in childbirth can help healthcare professionals to support women during labor and delivery. It can also be used as a guide for manual therapy techniques in the treatment of lower back pain.

== See Also ==
* '''[[Pelvis]]'''
* '''[[Childbirth]]'''
* '''[[Lumbar vertebrae]]'''
* '''[[Sacrum]]'''

== References ==
<references />

[[Category:Anatomy]]
[[Category:Obstetrics]]
[[Category:Gynecology]]

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Rhombus of Michaelis - Revision history

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