Psoas Muscle
Psoas Muscle - Related Videos
06:02
Posterior Approach for Debridement of the Psoas Abscess
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2020
This is a cadaveric study investigating the landmarks for the posterior approach for irrigation and debridement of the psoas abscess. The interval between the transverse processes (TP) was used to access the substance of the psoas muscle.
14:02
Ex Vivo Assessment of Contractility, Fatigability and Alternans in Isolated Skeletal Muscles
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Cited by 53 •
2012
We describe a method to directly measure muscle force, muscle power, contractile kinetics and fatigability of isolated skeletal muscles in an in vitro system using field stimulation. Valuable information on Ca2+ handling properties and contractile machinery of the muscle can be obtained using different stimulating protocols.
14:36
Evaluation of Muscle Function of the Extensor Digitorum Longus Muscle Ex vivo and Tibialis Anterior Muscle In situ in Mice
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Cited by 75 •
2013
Changes in limb muscle contractile and passive mechanical properties are important biomarkers for muscle diseases. This manuscript describes physiological assays to measure these properties in the murine extensor digitorum longus and tibialis anterior muscles.
05:30
Surgical Approach and Complications of Stand-alone Lateral Trans-Psoas Interbody Fusion
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2025
Interbody fusion of the lumbar spine can be achieved surgically using different techniques. Minimally invasive techniques, including lateral interbody fusion, have been developed within recent decades to reduce rates of complications and allow for quicker patient recovery. We provide insight into stand-alone lateral trans-psoas interbody fusion, highlighting potential complications and pitfalls.
03:26
Measuring Compound Muscle Action Potentials in Mouse Forelimb Muscles In Vivo
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2025
This video demonstrates an in vivo technique for measuring compound muscle action potential (CMAP) in mice. It outlines the steps for setting up electrodes, stimulating forelimb neurons that innervate muscle fibers, and recording muscle responses. The technique assesses neuronal demyelination and functional neuron loss.
FAQs
The psoas contributes to movement and stability through coordinated actions rather than hip motion alone. When it contracts, it flexes the hip and assists external rotation, while also helping stabilize the lumbar spine. That combination allows the muscle to support activities such as walking and lifting, where the trunk and lower limb must work together.
Its relationship with the iliacus is clinically important because the two muscles function together as the iliopsoas. Considering this combined action helps explain why assessment may address both hip movement and lumbar control rather than treating these as unrelated functions. The partnership is especially relevant when examining movement patterns that include hip flexion, trunk stability, or both.
Shortening, weakness, or tenderness can influence function in different ways. Reduced flexibility may contribute to movement restrictions, whereas impaired strength may affect the ability to perform tasks requiring hip motion or trunk control. Tenderness provides another clinical finding. Together, these features can help relate psoas involvement to low back pain, hip disorders, muscle imbalance, or functional limitations.
The psoas is relevant in both walking and lifting because these activities require more than isolated hip motion. Its contraction supports hip flexion while contributing to lumbar stability, linking lower-limb movement with trunk control. Examining it across such functional demands can help clinicians consider whether symptoms or limitations relate to coordination, strength, flexibility, or tenderness.
A medical evaluation can combine physical examination with imaging when clinically appropriate. Examination may focus on psoas strength, flexibility, and tenderness, while imaging can contribute to identifying strain or shortening. The results are interpreted in relation to low back pain, hip disorders, muscle imbalance, and functional limitations, rather than as an isolated measurement.
Targeted assessment is most relevant when a patient has low back pain, a hip disorder, suspected muscle imbalance, or a functional limitation in movement. It can also be useful when clinicians need to examine possible strain or shortening. Linking findings to the person's movement problem helps guide whether mobility training, therapeutic exercise, or movement-focused care is appropriate.
Treatment planning may combine therapeutic exercise, mobility training, and movement-focused care. The emphasis depends on what assessment identifies, such as reduced flexibility, weakness, tenderness, strain, or shortening. Rather than focusing only on the muscle, this approach aims to address how psoas function relates to hip movement, posture, lumbar stability, and the person's functional limitations.