Questions? Call Toll-Free 1-

Contact us today. We're here for you seven days a week.

Contact Us By Phone 1-
Am I a Candidate for Surgery? Learn More
Request an MRI Review Submit Information

Herniated Nucleus Pulposus (HNP) at L4/L5


HNP L4-L5

If you are experiencing lower back pain or the condition known colloquially as sciatica, you may have a L4/L5 herniated nucleus pulposus (HNP) – or, more simply, a herniated disc between the fourth and fifth vertebrae in your lumbar spine. Also known as a ruptured or prolapsed disc, a disc herniation is a common type of degenerative spine condition that can sometimes be caused by an injury but is usually traced to the regular wear and tear on the spine that comes with aging. This condition can become painful when the herniated disc material – the nucleus pulposus – compresses the spinal cord, sciatic nerve or another nerve in the spinal column.

Spine degeneration

L4/L5 HNP is a degenerative spine condition that affects the intervertebral disc that cushions the two largest, strongest vertebrae in the spine. This disc is particularly susceptible to deterioration over time because the lumbar spine is the most flexible section of the spine and also supports the majority of the body’s weight. Over time, this mobility and weight burden take a toll and the disc can become worn out and rupture. When a tear develops in the fibrous wall of the disc, the nucleus pulposus can extrude into the spinal column. This condition isn’t necessarily symptomatic unless the nucleus pulposus causes nerve compression.

L4/L5 HNP can result in:

  • Sciatica
  • Chronic, lower back pain
  • Soreness or stiffness in the legs, knees, or hip joints
  • A burning sensation in the legs
  • Muscle weakness
  • Numbness or tingling

Treatment options

Treatment options vary depending on the severity and cause of L4/L5 HNP, but in most cases disc herniation is manageable with a series of conservative, non-surgical treatments, including heat therapy, pain medication and exercise. In the event that your pain persists through several weeks of treatment, contact Laser Spine Institute. We can tell you more about how one of our minimally invasive, outpatient procedures might be able to help you find relief from back pain.

Need an immediate response?

Our live chat feature allows you to talk instantly with a representative.

  • - -

Download your free info packet on
Herniated Nucleus Pulposus
& receive our e-newsletter.



What is Laser Spine Surgery? Can Laser Spine Institute Help You?

You can get these answers by attending a complimentary medical seminar.

Back to Health

Be inspired, informed and connected.

Expert answers, informational videos and inspiring stories of patients who returned to life at its fullest with Laser Spine Institute.


Laser Spine Wellness

Patient Reviews and Stories

Natalie Gulbis shares her story about her road to recovery from back pain after minimally invasive surgery.



Learn about Natalie Gulbis' Recovery

Meet our Physicians and Surgeons

Our medical professionals know that you expect excellence in terms of medical attention. We strive to go Above and Beyond your expectations and deliver quality, patient-centered care at each of our surgery centers.

Learn about our physicians & medical staff