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Tag Archive

Below you'll find a list of all posts that have been tagged as “psoas”

Psoas Major crosses the hip and spinal joints

Psoas Major Function: References

This blog post contains the cited research references for the eleven-part blog post series on Psoas Major Function that is found on Learnmuscles.com.

footnotesiliopsoaspsoaspsoas majorreferences
Psoas major crosses the hip, sacroiliac, and spinal joints

Psoas Major Function: Summary of Psoas Major Function

Looking at the psoas major from a biomechanical perspective might be the key to understanding this elusive and controversial muscle.

biomechanicsfunctioniliopsoaskinesiologypsoaspsoas majorresearch
Psoas major is part of the deep front line myofascial meridian

Psoas Major Function: Psoas Major and Fascial Pulls

The psoas major’s has extensive fascial connections. The psoas major is part of the deep front line myofascial meridian (anatomy train).

anatomy trainsdeep front lineiliopsoasmyofascial meridianpsoaspsoas majorTom Myers
Psoas major crosses the hip, sacroiliac, and spinal joints

Psoas Major Function: Psoas Major and the Sacroiliac Joint

The psoas major crosses the hip and spinal joints. However, it is often overlooked that the psoas major also crosses the sacroiliac joint.

iliopsoaspsoaspsoas majorSacroiliac JointSI jointSIJstabilization
Tight musculature compresses joints

Psoas Major Function: Stabilization of the Spine by the Psoas Major

A healthy joint is both mobile and stable. However, some sources are concerned about the psoas major’s compression/stabilization effect upon the spine.

compressiondisc jointsfacet jointsiliopsoaspsoaspsoas majorSpinestabilization
Psoas major can flex and extend the lumbar spine

Psoas Major Function: Spinal Joint Actions – Sagittal Plane

The psoas major’s sagittal plane lumbar spine joint action is by far its most controversial function. The term “psoas paradox” describes this controversy.

anterior tiltaxisaxis of motionhyperlordosisHypolordosisiliopsoasLordosislordoticlumbar lordosislumbar spinemechanical axisPelvic tiltPosterior tiltpsoaspsoas majorsit upspinal extensionspinal flexionSpine
Psoas major laterally flexes the spine

Psoas Major Function: Spinal Joint Actions – Frontal and Transverse Planes

The frontal plane spinal action of the psoas major is fairly clear; it crosses the spinal joints laterally, so it lateral flexes the spine to that side.

axisaxis of motionClosed-chainCoronal planeFrontal planeHip JointHorizontal planeiliopsoaslever armleveragelordotic curvemechanical axismoment armOpen-chainpsoaspsoas majorSpineTransverse plane
Psoas major laterally rotates the hip joint

Psoas Major Function: Hip Joint Actions – Transverse Plane

The function of the psoas major has been claimed to be both medial rotation and lateral rotation. However, most sources agree that it is a lateral rotator.

Contralateral rotationexternal rotationfemoral rotationfemurHip Jointiliopsoaslateral rotationPelvic rotationpsoaspsoas majorrotation
Psoas major abducts the hip joint

Psoas Major Function: Hip Joint Actions – Frontal Plane

If the psoas major frontal plane open-chain action is abduction of the thigh at the hip joint, the closed-chain action is depression of the pelvis.

abductionAdductionbiomechanicsCoronal planeFrontal planeHip JointIliacusiliopsoaskinesiologypsoaspsoas major
Psoas Major is primarily a flexor of the hip joint

Psoas Major Function: Hip Joint Actions – Sagittal Plane

Note: This is the third blog post article in a series of 11 articles on Psoas Major Function. See below for the other articles in this series on psoas major function. The hip joint is a triaxial joint that allows …

Read More
anterior tiltbiomechanicsHip flexionHip Jointilacusiliopsoaskinesiologylever armleveragemoment armpelvispsoaspsoas majorSagittal planethigh flexion
Psoas Major crosses the hip and spinal joints

Psoas Major Function: Biomechanics of the Psoas Major

The psoas major is first and foremost, a muscle of the hip joint; however it is more complicated because it also crosses the spinal joints.

biomechanicsHip Jointkinesiologypsoaspsoas majorSpine
psoas major flexes the hip joint

Psoas Major Function: Introduction & Muscle Biomechanics

The Psoas Major may hold the distinction of being the most important as well as the most misunderstood muscle in the human body.

biomechanicsconcentric contractioneccentric contractionHip JointIliacusisometric contractionJoint actionkinesiologyMechanicsmuscle functionpsoaspsoas majorSpine
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