Disclaimer – This is the kind of post that makes one want to take a shower after reading. My apologies to readers without convenient access to bathing facilities.
One of the fastest growing segments of the surgical industry is the spinal implant business. In what may be the most comprehensive review of the problem, the Orange County Register reported:
“About 70 percent of U.S. adults — or 153 million people — have lower back pain, according to Millennium Research Group. Of those, about 15 million require medical treatment, and most eventually get spinal implants.” My take is that is a wildly overstated estimate; one survey reported that the total world market for devices was $4.2 billion; note this study used 2006 data. Another indicated the market was $5 billion in 2005, and predicted growth to $20 billion by 2015. Stryker, one of the major manufacturers, expects growth of 16% per year in the spinal implant market. Yet another report(note opens .pdf) indicated the 2007 worldwide market was $7 billion, with the US accounting for $5.4 billion of that total.
And boy is it profitable. One manufacturer (Allez Spine) sold screws to an implant device company for $79.31 each – screws that were then sold to hospitals for $1000 each (who then marked them up even more when billing insurers).

Yep, there are $480 worth of screws in this xray (wholesale), $6000 retail, and probably $9-12,000 to the insurer/patient. And that doesn’t include the other parts…
Medtronic, one of the larger device companies with about 45% market share in the US and the same worldwide, reported sales of $869 million for spinal implants last quarter, driven in part by a big jump in sales of its Kyphon technology. The $869 million represents growth of 35% from the same quarter last year.
The Kyphon story is an ugly one, and points to one potentially significant problem in the spine surgery industry – the focus on devices as a tool to maximize reimbursement.
Kyphon (the company) was acquired by Medtronic in 2005. The company settled a lawsuit filed by the Feds, agreeing to pay $75 million in fines. Kyphon agreed to stop providing inappropriate advice on reimbursement to providers, advice that resulted in hospitals filing inflated claims with Medicare for a spine procedure with the otherworldly name of kyphoplasty.
The details of the case, as reported by the New York Times, are revealing.
Kyphon “persuaded hospitals to keep people overnight for a simple outpatient procedure [bold added] to repair small fissures of the spine. Medicare then reimbursed the hospitals much more generously than it otherwise would have for the procedure, which was developed as a noninvasive approach that could usually be done in about an hour.
By marketing its products this way, Kyphon was able to artificially drive up demand among hospitals, bolstering its revenue and driving up its stock price. Medtronic subsequently bought the company, its competitor, for $3.9 billion, greatly enriching Kyphon’s senior executives. ”
Margins for Kyphon’s devices approached 90%, due in large part to the high price the company charged, a price that hospitals offset by extending hospital stays (as advised by Kyphon’s sales reps and reimbursement experts), thus generating higher bills and much higher revenue.
Another major contributor to the rapid increase in spinal implant surgeries may be the growth of device companies that have spine surgeons as stockholders. The OCR article reported that physician-owned companies are now under investigation by HHS’ Office of the Inspector General (OIG). In testimony before the Senate Special Committee on Aging, Gregory E. Demske, Assistant Inspector General for Legal Affairs at the OIG said:
“These financial relationships [between device manufacturers and physicians] can benefit patients and Federal health care programs by promoting innovation and improving patient care. However, these relationships also can create conflicts of interest that must be effectively managed to safeguard patients and ensure the integrity of the health care system…during the years 2002 through 2006, four manufacturers (which controlled almost 75 percent of the hip and knee replacement market) paid physician consultants over $800 million [bold added] under the terms of roughly 6,500 consulting agreements. Although many of these payments were for legitimate services, others were not. The Government has found that sometimes industry payments to physicians are not related to the actual contributions of the physicians, but instead are kickbacks designed to influence the physicians’ medical decisionmaking [bold added]. These abusive practices are sometimes disguised as consulting contracts, royalty agreements, or gifts.”
All this growth may well be based on a focus on surgical treatment that is just not supported by research. Some studies indicate surgery is not the best treatment for a substantial number of patients. According to the OCR article (source above);
a “2005 study of patients with back pain published in the journal of the British Medical Association concluded: “No clear evidence emerged that primary spinal fusion surgery was any more beneficial than intensive rehabilitation.”
“You look at the number of procedures and the rate of growth and it seems to far outstrip the number of patients who need this,” said Dr. Steven J. Atlas, a back specialist and Assistant Professor of Medicine at Harvard Medical School.”
And that old nemesis, provider practice pattern variation, is nowhere as obvious as with back surgeries. Looking at Medicare data, the back surgery rate in Fort Myers, Florida was 5 times higher than in Miami. Same population demographics, same state, but different providers.
Perhaps the best explanation for the considerable growth in the use of implants and spine surgery is the lack of evidence either for or against these procedures. There are some reports that indicate positive or negative outcomes, but nothing definitive has been published that could be used by payers and providers to judge the appropriateness of surgery for most patients with back injuries or degenerative conditions.