When applying mechanical traction for a herniated disc in the lumbar spine, what is the preferred patient position?

The preferred patient position when applying mechanical traction for a herniated disc in the lumbar spine is supine with both knees flexed. This position helps to create a more favorable environment for the reduction of disc herniation and alleviation of symptoms.

When the patient is supine with knees flexed, the lumbar lordosis is reduced, and this position decompresses lumbar structures, alleviating pressure on the disc and nerve roots. Flexion can also help create more space within the intervertebral foramen, allowing for better disc movement and possibly facilitating resorption of herniated material.

Prone positions, such as lying flat with no pillow or with a pillow under the abdomen, can further contribute to increased lumbar lordosis and may not effectively relieve pressure off the disc area. They may also exacerbate symptoms for individuals with a herniated disc because the anterior pelvic tilt that occurs in these positions can put additional stress on the lumbar spine. Thus, positioning the patient supine with the knees flexed is typically most effective for providing traction benefits in this scenario.