Minimally Invasive Surgery


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    In general, the goal of minimally invasive spine (MIS) surgery is to stabilize the vertebral bones and spinal joints and/or relieve pressure being applied to the spinal nerves — often a result of conditions such as spinal instability, bone spurs, herniated discs, scoliosis or spinal tumors.

    As opposed to open spine surgery, minimally invasive surgical approaches can be faster, safer and require less recovery time. Because of the reduced trauma to the muscles and soft tissues (compared to open procedures), the potential benefits are:

    • Better cosmetic results from smaller skin incisions (sometimes as small as several millimeters)
    • Less blood loss from surgery)
    • Reduced risk of muscle damage, since less or no cutting of the muscle is required)
    • Reduced risk of infection and postoperative pain)
    • Faster recovery from surgery and less rehabilitation required)
    • Diminished reliance on pain medications after surgery)
  • In addition, some MIS surgeries are performed as outpatient procedures and utilize only local anesthesia — so there is less risk for an adverse reaction to general anesthesia.

    As with any surgical procedure, no matter how minimal, there are certain risks associated that include, but are not limited to:

    • Possible adverse reaction to the anesthetic)
    • Unexpected blood loss during the procedure)
    • Localized infections, no matter how small the incision area)

    And, though uncommon, there is always a small chance that the initial MIS surgery cannot be completed, requiring either a second procedure or full open surgery.

    Conditions Treated Using MIS Procedures

    • Degenerative disc disease
    • Herniated disc
    • Lumbar spinal stenosis
    • Spinal deformities such as scoliosis
    • Spinal infections
    • Spinal instability including spondylolisthesis
    • Vertebral compression fractures
    • Spinal tumors

    How Minimally Invasive Spine Surgery Works

    Because the spinal nerves, vertebrae and discs are located deep inside the body, any approach to gain access to the spinal area requires moving the muscle tissue out of the way. In general, this is facilitated by utilizing a small incision(s) and guiding instruments and/or microscopic video cameras through these incisions. Contrary to popular belief, lasers are very rarely used in MIS surgeries.

    A number of methods can be used to minimize trauma during MIS surgery. Some of the more common techniques are outlined here.

  • Common MIS Surgery Treatment Options

    A number of specific techniques have been deployed for MIS surgery. Though the field continues to develop, the list below highlights some of the most common options.

    Spinal discs are essentially elastic rings with soft material inside that serve as cushions between the vertebral bones. If the elastic ring becomes weakened, the soft tissue inside can extrude — or herniate — outside of the elastic ring. The herniated disc material can compress the nerves passing by, thus causing pain. If surgical treatment is recommended to trim or remove the herniated disc, it may be possible to perform this procedure with MIS surgery using tubular dilators and a microscope or endoscope.

    Spinal decompression:
    Spinal stenosis, which is a narrowing of the vertebral canal, is a common condition that can result in compression of the nerves. This can produce a variety of symptoms, including pain, numbness and muscle weakness. If surgery is recommended, it may be possible to remove the bone and soft tissues causing the nerve compression through an MIS approach using tubular dilators and a microscope or endoscope. The more common decompressive procedures include laminectomy and foraminotomy.

    Transforaminal Lumbar Interbody Fusion (TLIF):
    This is a MIS technique that is performed for patients with refractory mechanical low back and radicular pain associated with spondylolisthesis, degenerative disc disease and recurrent disc herniation. The procedure is performed from the back (posterior) with the patient on his or her stomach. Utilizing two small incisions, screws and rods are placed between two or more vertebral levels. The intervertebral disc is removed and a cage filled with bone is placed in that void with the goal of stabilizing the levels affected.

    MIS Fusion Procedures

    • Minimally Invasive Lateral Interbody Fusion
    • Minimally Invasive Posterior Lumbar Interbody Fusion (PLIF)
    • Minimally Invasive Transforaminal Lumbar Interbody Fusion (TLIF)
    • Minimally Invasive Posterior Thoracic Fusion

    Candidates for MIS Surgery

    A doctor will be able to tell which MIS surgeries, if any, might be ,an option for treating a spinal condition. In some situations, MIS surgery may not be as safe or effective as traditional open surgery. If so, the doctor will be able to inform you about the relative risks and benefits. In addition, there are some conditions that are not truly treatable with MIS surgery.


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