Quadratus lumborum

Functional Anatomy and Biomechanics

Published in Emeric Arus, Biomechanics of Human Motion, 2017

Musculus quadratus lumborum represents the area of the posterior abdominal wall minus the posterior muscles of the pelvis. This muscle has more fiber segments at the distal insertion. Insertion: The origin is on the dorsal part of the iliac crest and is distally inserted on the 12th rib (medial part) and continues with four distal insertions on the transverse processes of the lumbar vertebrae 1–4. Action: It is a lateral flexor of the trunk and helps to extend the lumbar vertebral column. Bilaterally, it gives a strong stability to the trunk. Posterior muscles of the pelvis are represented by Figure 3.16b.

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites

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Journal Information

Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019

Riza Bayoglu, Ogulcan Guldeniz, Nico Verdonschot, Bart Koopman, Jasper Homminga

Grand OSI corresponding to each muscle is shown as stacked columns in Figure 2. Similar to the changes in disc forces, relatively higher values were found for certain muscles (quadratus lumborum, intercostales interni, intercostales externi, longissimus thoracis, and iliocostalis lumborum) located in the rib cage and lumbar regions. For all other muscle groups, cumulative OSI was below 10%.

Quadratus lumborum

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Functional Anatomy and Biomechanics

Sensitivity of muscle and intervertebral disc force computations to variations in muscle attachment sites