What does it mean when the physiological lumbar lordosis becomes straightened?

Loss of the lumbar spine’s physiological lordosis—also termed straightening of the lumbar curvature—is a common radiographic finding associated with various lumbar spinal disorders. Patients are generally advised to undergo physical therapy and traction, or to combine traction with acupuncture and tuina (Chinese therapeutic massage), which tends to yield relatively rapid clinical improvement. Concurrently, patients should avoid prolonged sitting, minimize forward bending, and refrain from lifting heavy objects. But what exactly causes loss of the lumbar spine’s physiological lordosis? The following section addresses this question.

What Causes Loss of the Lumbar Spine’s Physiological Lordosis?

1. Poor Posture

Loss of the lumbar spine’s physiological lordosis is most commonly attributable to long-term improper posture. Initially, this may manifest only as postural deviations—such as slouching or kyphosis—and localized excessive mechanical loading. Over time, such biomechanical stress leads to chronic soft-tissue injury, resulting in conditions like lumbar myofascial strain and chronic low back pain. This condition is therefore also referred to as “postural low back pain.” Loss of lumbar lordosis represents a further progression of this cumulative process. Accordingly, postural correction is paramount—the foundation and prerequisite for effective rehabilitative exercise.

2. Lumbar Muscular Injury

The lumbar musculature plays a critical role in maintaining spinal stability. Injury to these muscles can exert abnormal traction on the lumbar vertebrae, compromising structural stability and thereby contributing to loss of lumbar lordosis. Thus, individuals engaged in occupations requiring prolonged static postures should regularly change positions and incorporate targeted strengthening exercises—effective strategies for preventing loss of lumbar lordosis. Moreover, in daily life, one should endeavor to avoid external trauma to the lumbar musculature.

3. Lumbar Spinal Pathology

With degenerative changes in the lumbar vertebrae and intervertebral discs, the compressive load borne by the discs decreases. When the annulus fibrosus ruptures and the nucleus pulposus herniates, corresponding alterations in lumbar spinal anatomy occur—including pathological narrowing of the anterior disc space relative to the posterior space—ultimately leading to loss of lumbar lordosis. Therefore, timely medical evaluation and treatment are strongly recommended to prevent disease progression.

The above outlines the primary causes of loss of the lumbar spine’s physiological lordosis. We hope this information proves helpful to you!