The psoas assists in stabilizing which part of the spine?

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The psoas major has its origins on the lumbar vertebrae (and lower thoracic) and travels to the femur, crossing the lumbar spine as it does. Because of these proximal attachments, when the psoas contracts it can exert stabilizing forces directly on the lumbar segments, helping to maintain neutral alignment and control motion at L1–L5 during activities like standing, bending, or lifting. Its role as a hip flexor goes alongside this stabilizing influence, but the key point is that the lumbar spine receives the direct stabilizing effect from the psoas due to its lumbar attachments. It does not primarily stabilize the cervical or thoracic regions, nor the sacral region, whose stability hinges on different muscles and ligaments. So, the psoas assists in stabilizing the lumbar spine.