What is Minimally Invasive Surgery (MIS)?

Spinal discs are essentially elastic rings with soft material inside that serve as cushions between the vertebral bones. If that 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.

A discectomy is the surgical removal of that material pressing on a nerve root or the spinal cord due to a herniated or bulging disc. A discectomy is used to treat a pinched nerve (nerve root compression), bone spur, sciatica, or radiating pain through the limbs called radiculopathy.

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, in a minimally invasive discectomy, a special retractor and a microscope or endoscope are used to perform the removal of the herniated disc.

This allows for a smaller incision and a faster recovery. Surgery is completed under general anesthesia, typically taking less than an hour to complete. Most patients go home several hours after the procedure.

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.

Anterior Cervical Discectomy and Fusion (ACDF) is a surgical procedure where the disc is removed through the front of the neck (anterior approach) in order to relieve pressure from the spine (decompress) and relieve pain. This procedure is combined with a fusion surgery in order to stabilize the neck. It is often used to treat herniated disc and degenerative disc disease.

A foraminotomy is a procedure that widens the tunnel (foramen) in your back where nerve roots leave your spinal canal. It is used to relieve the symptoms of nerve root compression, also known as a “pinched nerve” or “radiculopathy.” These symptoms may include pain, numbness, tingling or muscle weakness. The procedure can also be performed using a minimally invasive approach that requires no hospitalization. A foraminotomy of the spine can also be used to treat the following conditions:

• Foraminal stenosis
• Herniated disc
• Pinched nerve (nerve root compression)
• Bone spur
• Sciatica
• Radiculopathy

In a laminectomy, the surgeon removes the lamina (the back part of the vertebra that covers and protects your spinal canal). The procedure takes pressure off the spinal cord or a spinal nerve in cases such as a lumbar stenosis, a herniated disc or bone spur. This procedure can be performed at any level of the spine, using minimally invasive techniques. Patients with single-level or two-level stenosis of the lumbar spine are usually sent home on the day of surgery. A laminectomy can be used to treat spinal stenosis, degenerative disc disease or a herniated disc. Click here to view a video.

Spinal fusion is a surgery performed to permanently join two or more bones in the spine so there is no movement between them. To fuse the bones together, the surgeon uses a graft. There are several different types of graft material. For example, an autograft is composed of strips of bone obtained from the area of surgery or another part of your body, such as your pelvic bone, a cadaver bone obtained from a bone bank or made from synthetic material. To promote proper bony fusion, the vertebrae is fixed together with rods, screws, plates or cages to keep the bones from moving until the grafts fully heal. This is called spinal instrumentation. And while fusion surgery does take away some spinal flexibility, in most spinal fusions only small segments of the spine are involved, which do not limit motion much.

Fusion surgery of the spine can be approached from the front, the side or the back. Recent technological advances have allowed fusion surgery to be performed using minimally invasive techniques in select cases. We routinely perform minimally invasive fusion of the lumbar spine from the side (XLIF) as well as from the back (TLIF or PLIF surgery). These less invasive techniques reduce infection rates, minimize blood loss and result in faster patient recovery.

Spinal fusion may relieve symptoms of many back conditions, including the following:

• Degenerative disk disease
• Spondylolisthesis
• Spinal stenosis
• Scoliosis
• Fracture
• Infection
• Tumor

During this procedure, a surgeon removes the synovial cyst and any structures compressing the nerves. This surgery is performed on an outpatient basis with a minimally invasive technique to avoid the need for fusion surgery in select cases.

SI joint fusion is performed to encourage bone growth over the sacroiliac joint and create one immobile unit for conditions including sacroiliac joint dysfunction that is a direct result of sacroiliac joint disruption and degenerative sacroiliitis. Dr. Khanna utilizes the iFuse Implant System, which is a minimally invasive surgical option. The system is designed to guide the instruments that prepare the bone and facilitate placement of the titanium implants across the sacroiliac joint. The whole MIS SI joint procedure takes about an hour, and recovery time is significantly less than open surgery.

In a surgery with the Mobi-C Cervical Disc, the unhealthy disc is removed, but instead of a bone spacer or plastic implant along with a plate and screws, a Mobi-C is implanted into the disc space. Where a fusion procedure is intended to eliminate motion at the surgery levels, the goal of a surgery with Mobi-C is to allow motion at those levels. The end result is replacement of the damaged disc with the goal of maintaining neck movement. The Mobi-C fits entirely within the disc space.