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Spinal Fusion: Procedure, Risks and Recovery

Spinal fusion is a surgical procedure that permanently joins two or more vertebrae. It is used to treat instability, deformity, or severe back pain.

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Things worth knowing about "Spinal fusion"

Spinal fusion is a surgical procedure that permanently joins two or more vertebrae. It is used to treat instability, deformity, or severe back pain.

What is Spinal Fusion?

Spinal fusion (also known as spondylodesis) is a surgical procedure in which two or more vertebrae of the spine are permanently connected and immobilized. The goal of the procedure is to stabilize an unstable or painful spinal segment and eliminate movement between the affected vertebrae. Spinal fusion is one of the most commonly performed spinal surgeries and can be carried out on the cervical (neck), thoracic (mid-back), or lumbar (lower back) spine.

Indications and Causes

Spinal fusion is recommended when conservative treatments have failed to provide adequate relief or when structural instability of the spine is present. Common indications include:

Degenerative disc disease: Severely worn intervertebral discs causing chronic pain and functional limitations.
Spondylolisthesis: Slipping of one vertebra over another.
Scoliosis or kyphosis: Severe spinal deformities.
Vertebral fractures: Broken vertebrae due to trauma or osteoporosis.
Spinal tumors: Tumors compromising spinal stability.
Infections: Such as spondylodiscitis (infection of the disc and adjacent vertebrae).
Spinal stenosis: Narrowing of the spinal canal causing nerve compression.

Surgical Techniques

During spinal fusion, the affected vertebral segments are fixed using implants (screws, rods, plates, or cages) and joined together using bone graft material. The bone graft can be taken from the patient's own body (autologous graft, often from the iliac crest), from a donor (allograft), or consist of synthetic bone substitute material.

Surgical Approaches

Depending on the location of the affected segments and the individual patient situation, different surgical approaches are used:

Posterior approach (from the back): Most common, e.g., PLIF (Posterior Lumbar Interbody Fusion) or TLIF (Transforaminal Lumbar Interbody Fusion).
Anterior approach (from the front): E.g., ALIF (Anterior Lumbar Interbody Fusion).
Lateral approach (from the side): E.g., XLIF or DLIF.
Minimally invasive techniques: Increasingly used to reduce tissue damage and shorten recovery time.

Recovery and Follow-Up Care

After surgery, careful follow-up care is essential. The actual fusion process, in which the bone grows together, typically takes 3 to 12 months. During this period, physiotherapy is used to strengthen the surrounding muscles and maintain mobility in the unaffected spinal segments. Wearing an orthosis (back brace) may be recommended during the first weeks following surgery.

Risks and Complications

As with any surgical procedure, spinal fusion carries certain risks:

Infection at the surgical site
Nerve injury potentially causing numbness, weakness, or pain
Pseudarthrosis: Failure of the bone graft to fuse properly
Adjacent segment disease: Increased stress and accelerated degeneration of neighboring vertebral joints
Hardware failure: Loosening or breakage of screws or rods
Deep vein thrombosis or pulmonary embolism

Outcomes and Prognosis

Spinal fusion can lead to significant pain relief and improvement in quality of life for suitable patients. Success rates depend on the underlying condition, the patient's age and general health, and adherence to post-operative recommendations. Reduced mobility in the fused segment is a permanent effect of the surgery but is generally well tolerated when the indication for surgery has been carefully evaluated.

References

Rothman-Simeone and Herkowitz's The Spine, 7th Edition. Elsevier, 2018.
Mroz TE, et al. - Trends in lumbar fusion surgery and complications: a matched pair analysis of the 2009 and 2014 Medicare data. - J Neurosurg Spine. 2017;27(4):378-384.
World Health Organization (WHO): Musculoskeletal conditions. www.who.int/news-room/fact-sheets/detail/musculoskeletal-conditions

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