Does laser spinal surgery really work? Are those FLorida Institutes that do this lawful?
Answers: The aim of percutaneous laser disc decompression (PLDD) is to vaporize a small portion of the nucleus pulposus of an intervertebral disc, thereby reducing the volume of a diseased disc and the pressure within it.
A small amount of tissue is excised from the center or nuclear part of the disc, which is believed to exert an effect on a noncontiguous portion of nucleus that is protruding through the annulus fibrosus and abutting an exiting boldness root. First described by Hijikata in relation to the percutaneous discectomy method, the central cavity created by laser is believed to allow the nuclear protrusion to move back in the disc. A small change in disc nucleus volume can exert disproportionately large change on the disc.
Yunezawa and coworkers first demonstrated significant alterations in intradiscal pressure in response to vertical load after Nd:YAG laser treatment. Their study also reported the equivalency of laser to aggressive booklet curettage. Choy and Altman (1995) reported greater than 50% reduction of intradiscal pressure in response to load following treatment next to 1000 J of Nd:YAG laser energy. Prodoehi and associates reported similar results using 1200 J from the holmium (Ho):YAG laser.
No specimen is available to weigh after laser discectomy; therefore the amount of disc removed can only be approximated. By calculating the geometry of the laser tract, Choy and Altman (1995) estimated that 1000 J of Nd:YAG laser perkiness vaporized 98.52 mg of disc. Lane and coworkers, who compared effectiveness of 1200 J each of carbon dioxide, argon, and Ho:YAG laser energy, reported that Ho:YAG be superior, ablating 2.4 g of disc tissue. By comparison, a clinical trial of automated percutaneous discectomy reported removal of 2-7 g of disc tissue with a suction cutting device. Quigley's group compared an automated device, Nd:YAG laser, and Ho:YAG laser and clearly demonstrated the superiority of the automated device in removing the greatest mass of tissue.
This minimally invasive technique can be perform in patients who need surgical intervention for disc herniation with leg backache from radiculopathy. Patient selection, and especially disk morphology, are the two most important factors determining the choice of the technique.
Exclusion criteria include stenosis or facet hypertrophy and disc fragment, although recent review from Knight et al have described its use in foraminoplasty. Relative contraindications are progressive neurological deficit, involvement in workers' compensation cases, and previous surgery at the same disc stratum.
In general, the herniation must have continuity with the parent disc; rupture of the annulus is not a contraindication. All patients must be considered on an individual reason.
Criteria for inclusion are undergoing continuing change. Although the optimal candidate as previously described is an untreated single-level herniation near limited migration or sequestration of free fragments, a more recent study from Ahn et al has shown its effectiveness for lasting disc herniations in some selected cases. What is unacceptable very soon may, with modifications, become acceptable in the adjectives. During this early stage of PLDD, not adopting a fixed position is important.
The most extensive experience surrounded by the literature was published by Choy and Ascher, who used an Nd:YAG laser. They observed 333 patients for a mean duration of 26 months. The success rate be 78.4% (as measured by a good or fair response) according to MacNab.
Siebert (1995) reported on his first 100 patients treated with Nd:YAG. The nouns rate was 78% at mean follow-up point of 17 months.
Davis reported an 85% success rate next to the KTP laser, with success rate defined as minimal discomfort and the ability to return to money-making employment (follow-up duration was not specified). Yeung (2000) reported preliminary assessment of more than 1000 patients whose herniated lumbar discs were treated with KTP laser. The reported nouns rate (good or excellent results) was 84%. No specifics were supplied.
Sherk and colleagues used Ho:YAG laser in a comparison of laser discectomy and conservative treatment. No differences be noted between treated and control groups. They concluded that laser discectomy is a safe procedure that appears to be effective in relieving symptoms surrounded by some patients. The author uses Ho:YAG laser, and successful results are approximately 80% (comparable to those of other investigators). In another study from India, Ho:LADD (laser-assisted disc decompression) is a very cost-effective and minimally invasive procedure with patient mobilization on the double after the surgery.
According to Kramer, the best clinical results were found in discographic stages 7 and 8. In cases of epidural leak of contrast prevailing conditions and in cases of total degeneration, the clinical results were significantly poor (stages 6 and 9).
The literature now includes 23 well-documented cases of erectile dysfunction cause by spinal cord disc herniation. PLDD is a minimally invasive procedure that that can be used to treat such herniation.
From 1991-1993, 31 patients with herniated cervical discs were treated with PLDD. In 1990, a few of these patients be treated with the Nd:YAG laser with no complications. Since 1991, the authors have used the Ho:YAG laser; 28 of 31 patients experienced distress relief in a 6-week follow-up period. PLDD is a viable treatment for cervical discs.
Singh et al reviewed 38 research reports published between 1986 and 2005 for intradiscal disease therapy classification, surgical intervention, and treatment outcomes (neurologic status, pain scores, and ambulation). Their results revealed that the surgical literature on the government of intradiscal disease continues to be limited, and arthrodesis continues to be the primary treatment modality in most patients. Newer treatment options including laser discectomy enjoy shown promising results with regards to symptomatic relief and impulsive return to function.
Provocative discography is recommended prior to the percutaneous lumbar disc decompression. Besides discectomy, laser has recently been used by Knight et al for endoscopic foraminoplasty as all right.
Discitis is the only documented complication of laser discectomy. In 1993, Choy's group tabulated the world experience with laser discectomy. Choy reported 2 cases of discitis.
Subchondral marrow abnormality may occur in the vertebral endplates after Ho:YAG laser discectomy. Possible causative mechanisms include thermal injury and photoacoustic shock. However, these change probably do not affect surgical outcomes and appear to resolve over time
The rapid acceptance of minimally invasive surgery in the United States have occurred largely without statistical proof of its superiority over traditional methods. All members of the healthcare paddock now see the need for valid outcome studies supporting the efficacy of new treatment technique. PLDD will gain wide acceptance only if it is demonstrated statistically to be a undisruptive and effective alternative treatment to lumbar disc herniation.
Various laser wavelengths have been used, but no consensus exists on the subject of which is most efficacious. Good candidates for this procedure have a classic clinical syndrome and neuroimaging evidence.
In cases of ruptured posterior longitudinal ligament (ie, epidural leak of contrast environment in discography), PLDD is not indicated. Indications for the operation first of all depend on the clinical symptoms, but the success of the operation depends on the discographic findings.
Percutaneous microdecompressive endoscopic cervical discectomy near laser thermodiscoplasty has proven to be a safe and efficacious minimally invasive procedure in one covering series of patients with herniated cervical discs with unilateral radicular pain.
PLDD perform with CT scan and fluoroscopic guidance appears to be a safe and cost-effective treatment for herniated intervertebral discs and is getting more utilized over the last 3-5 years. It is minimally invasive, is perform in an outpatient setting, requires no general anesthesia, results in no scarring or spinal instability, reduce rehabilitation time, is repeatable, and does not preclude open surgery should that become necessary.
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