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Lumbar Pars Interarticularis Spondylolysis Injection

What does “Lumbar Pars Interarticularis Injection” mean?

Here is the meaning of each word:

  1. Lumbar: area of the spine located in the low-back
  2. Pars Interarticularis: thin piece of bone of a vertebra which connects the lamina and the pedicle.
  3. Injection: to deliver medication into an area of the body

Altogether, “Lumbar Pars Interarticularis Injection” means to inject medication onto the bone connecting the lamina and the pedicle of a vertebra.

What is a Lumbar Pars Interarticularis Injection?

A Lumbar Pars Interarticularis injection is a way to deliver medication to this area of the spine with the help of an X-Ray machine. Typically it is done for a known or suspected fracture of the Pars Interarticularis.

Why is a Lumbar Pars Interarticularis Injection done?

This injection is done for a condition called a “Spondylolysis” of the spine. In this condition, the Pars Interarticularis suffers a stress fracture. Patients with this condition often suffer from low-back pain. To help with the diagnosis and the pain, sometimes medication such as anti-inflammatories or local anesthetics are injected at the site of the stress fracture.

How is a Lumbar Pars Interarticularis Injection done?

Here are some of the steps of how this procedure is done:

  1. This procedure is usually done in an Operating Room or Procedure Room
  2. Patients sometimes receive relaxing medications through an intravenous catheter (IV) for this procedure.
  3. The patient is placed on the stomach (prone)
  4. The area of the low-back is cleaned with an antiseptic solution
  5. Sterile sheets (drapes) are placed around the area
  6. The skin is anesthetized with local anesthetic
  7. An X-Ray machine is used to locate the Pars Interarticularis on each side of the Vertebra.
  8. A specialized needle (spinal needle, procedure needle) is placed onto the Pars Interarticularis with the help of the X-Ray machine.
  9. Sometimes contrast dye (fluid which looks dark on an X-Ray) is injected to see the fracture of the Pars Interarticularis.
  10. Medication such as anti-inflammatories (steroids) or local anesthetics are injected into the fracture site.

If the injection is done to make the diagnosis of a spondylolysis, often only local anesthetics are injected. Following the injection, the patient is then examined to see if the pain is relieved.

  1. The needle is withdrawn.
  2. The patient is brought to the Recovery Area for observation.

How long does it take to perform a Lumbar Pars Interarticularis Injection?

This procedure takes about 10-15 minutes to complete.

What benefit can patients gain from a Lumbar Pars Interarticularis Injection?

    1. If the injection is done to find out if this is the source of a patient’s pain, the benefit is that the injection can help confirm the diagnosis and make a treatment plan.
    2. If the injection is done to help with the pain from a known spondylolysis, then pain relief is the benefit. Patients can get relief for weeks to months after this injection.