Spine (Phila Pa 1976) 2011 (Feb 15); 36 (4): 320–331
Trang H. Nguyen, MD, PhD, David C. Randolph, MD, MPH, James Talmage, MD,
Paul Succop, PhD, and Russell Travis, MD
From the Division of Epidemiology and Biostatistics,
Department of Environmental Health,
University of Cincinnati College of Medicine, Milford, OH;
Meharry Medical College, Nashville, TN; and
Department of Physical Medicine and Rehabilitation,
University of Kentucky College of Medicine, Lexington, KY.
Researchers reviewed records from 1,450 patients in the Ohio Bureau of Workers’ Compensation database who had diagnoses of disc degeneration, disc herniation or radiculopathy, a nerve condition that causes tingling and weakness of the limbs. Half of the patients had surgery to fuse two or more vertebrae in hopes of curing low back pain.
The other half had no surgery, even though they had comparable diagnoses.
After two years, only 26 percent of those who had surgery had actually returned to work.
That translates to a resounding 74% failure rate!
This article also reveals that workers have a 257% better chance of returning to work IF THEY AVOID SURGERY in the first place!
That's because 67 percent of patients who had the same exact diagnosis, but DIDN'T get the surgery, DID return to work.
In another troubling finding, the researchers determined that there was a 41 percent increase in the use of painkillers, particularly opiates, in those who had the surgery. Last year we reported that deaths from addictive painkillers has doubled in the last 10 years.
“The study provides clear evidence that for many patients, fusion surgeries designed to alleviate pain from degenerating discs don’t work”, says the study’s lead author Dr. Trang Nguyen, a researcher at the University of Cincinnati College of Medicine.
Commentary from an MSNBC.com article titled:
“Back Surgery May Backfire on Patients in Pain”
Experts estimate that nearly 600,000 Americans opt for back operations each year. But for many like Scatena, surgery is just an empty promise, say pain management experts and some surgeons.
A new study in the journal Spine shows that in many cases surgery can even backfire, leaving patients in more pain.
Researchers reviewed records from 1,450 patients in the Ohio Bureau of Workers’ Compensation database who had diagnoses of disc degeneration, disc herniation or radiculopathy, a nerve condition that causes tingling and weakness of the limbs. Half of the patients had surgery to fuse two or more vertebrae in hopes of curing low back pain. The other half had no surgery, even though they had comparable diagnoses.
After two years, just 26 percent of those who had surgery returned to work. That’s compared to 67 percent of patients who didn’t have surgery. In what might be the most troubling study finding, researchers determined that there was a 41 percent increase in the use of painkillers, specifically opiates, in those who had surgery.
The study provides clear evidence that for many patients, fusion surgeries designed to alleviate pain from degenerating discs don’t work, says the study’s lead author Dr. Trang Nguyen, a researcher at the University of Cincinnati College of Medicine.
Unfortunately, for most patients with bad backs, there is no easy solution, no magic bullet. Pain management experts — and some surgeons — say that patients need to scale back their expectations. With the right treatments, pain can be eased, but a complete cure is unlikely.
27 million adults with back problems
A recent report by the Agency for Healthcare Research and Quality, a federal organization, found that in 2007, 27 million adults reported back problems with $30.3 billion spent on treatments to ease the pain. While some of that money is spent on physical therapy, pain management, chiropractor visits, and other non invasive therapies, the biggest chunk pays for spine surgeries.
Yale University School of Medicine,
New Haven, CT, USA.
This article is noteworthy as an examination of outcomes among patients with work-related low back injuries who have undergone fusion surgery. While it is a retrospective study and adequate comparability between the surgically treated group and the non-surgically treated group cannot be guaranteed, outcomes among those undergoing fusion surgery revealed an alarming number of poor clinical outcomes.
The authors compared 725 lumbar fusion cases with 725 controls. All study subjects were drawn from a Workers? Compensation database. At 2 years, only 26% of individuals who underwent fusion surgery had returned to work, compared to 67% of those not treated surgically. Of those undergoing fusion surgery, 36% suffered surgical complications and 27% required additional surgery.
The rates of permanent disability were 11% among those who underwent fusions and 2% among those who did not undergo surgery. Over the course of the study, 17 surgical patients died, compared to 11 controls. While the baseline characteristics of surgical and non-surgical patients were examined, including diagnosis, weekly wages, legal representation, total days off, magnetic resonance imaging (MRI) findings, number of vocational and rehabilitation sessions, body mass index (BMI), daily opioid dose and discogram performance -- and no statistically important interactions were found -- it is still not possible to guarantee that the fusion and control populations were truly equivalent with respect to severity of lumbar disc disease.
That said, even with absent comparison with a non-surgical group, the outcomes among those undergoing fusion were alarming. An implication of this study would include the need to examine in a prospective way outcomes among clinically comparable patients randomized to fusion surgery or conservative therapy.
On a practical clinical level, the study suggests that patients contemplating lumbar fusion surgery need to be educated regarding the sub-optimal outcomes associated with the procedure. Patients contemplating lumbar fusion surgery should be informed regarding the outcomes associated with the procedure, including the low likelihood of returning to work, high rate of reoperation, high rate of complications and the possibility of permanent disability.
STUDY DESIGN: Historical cohort study.
OBJECTIVE: To determine objective outcomes of return to work (RTW), permanent disability, postsurgical complications, opiate utilization, and reoperation status for chronic low back pain subjects with lumbar fusion. Similarly, RTW status, permanent disability, and opiate utilization were also measured for nonsurgical controls.
SUMMARY OF BACKGROUND DATA: A historical cohort study of workers' compensation (WC) subjects with lumbar arthrodesis and randomly selected controls to evaluate multiple objective outcomes has not been previously published.
METHODS: A total of 725 lumbar fusion cases were compared to 725 controls who were randomly selected from a pool of WC subjects with chronic low back pain diagnoses with dates of injury between January 1, 1999 and December 31, 2001. The study ended on January 31, 2006. Main outcomes were reported as RTW status 2 years after the date of injury (for controls) or 2 years after date of surgery (for cases). Disability, reoperations, complications, opioid usage, and deaths were also determined.
RESULTS: Two years after fusion surgery, 26% (n = 188) of fusion cases had RTW, while 67% (n = 483) of nonsurgical controls had RTW (P= 0.001) within 2 years from the date of injury. The reoperation rate was 27% (n = 194) for surgical patients. Of the lumbar fusion subjects, 36% (n = 264) had complications. Permanent disability rates were 11% (n = 82) for cases and 2% (n = 11) for nonoperative controls (P= 0.001). Seventeen surgical patients and 11 controls died by the end of the study (P = 0.26). For lumbar fusion subjects, daily opioid use increased 41% after surgery, with 76% (n = 550) of cases continuing opioid use after surgery. Total number of days off work was more prolonged for cases compared to controls, 1140 and 316 days, respectively (P < 0.001). Final multivariate, logistic regression analysis indicated the number of days off before surgery odds ratio [OR], 0.94 (95% confidence interval [CI], 0.92–0.97); legal representation OR, 3.43 (95% CI, 1.58–7.41); daily morphine usage OR, 0.83 (95% CI, 0.71–0.98); reoperation OR, 0.42 (95% CI, 0.26–0.69); and complications OR, 0.25 (95% CI, 0.07–0.90), are significant predictors of RTW for lumbar fusion patients.
CONCLUSIONS: This Lumbar fusion for the diagnoses of disc degeneration, disc herniation, and/or radiculopathy in a WC setting is associated with significant increase in disability, opiate use, prolonged work loss, and poor RTW status.
From the FULL TEXT Article:
Lumbar arthrodesis (fusion) is a surgical procedure performed
to unite spinal vertebrae to eliminate mobility.
There have been few published studies evaluating lumbar
fusion outcomes in US workers’ compensation subjects. [1–4]
In these studies, reoperation rates are the only outcome
that has been consistently reported (about 22%). Surgical
complications of 12% were reported in only one study at
3 months after surgery.  Permanent or temporary disability
results 2 years after fusion are variable among the studies,
18% to 68%. [1, 2, 4] Similarly, return to work status (RTW) also
varied from 41% to 78%. [2, 4]
True outcomes are difficult to determine when results are
variable. The number of lumbar fusions for degenerative conditions
has increased 220% in the United States from 1990. 
A recent systematic review of randomized clinical trials comparing
lumbar fusion to conservative care indicates solid conclusions
cannot be reached due to the methodologic limitations
and limited data.  In 2006, a different systematic review
questioned the cost effectiveness of lumbar fusion. 
In this study, OH Workers’ Compensation data from
January 1, 1999 to January 31, 2006 was used to assess the
work status 2 years after lumbar fusion, permanent disability
awards, surgical complications, reoperation status, and pain
medication usage among cases and randomly selected controls
with chronic low back pain (CLBP).
MATERIALS AND METHODS
Data for this historical cohort study were collected from the
Ohio Bureau of Workers’ Compensation database. Extracted
data included information on the injury (accident information
and occupation), demographics, procedures, office visits,
medications, RTW, permanent disability, and death. Personal
identification information was not a part of the data.
After approval by the Institutional Review Board at the
University of Cincinnati College Of Medicine, 1450 study
subjects were identified from the Ohio Bureau of Workers’
Compensation database. Cases were subjects 18 to 70 years
of age with CLBP classified by International Classification of
Diseases, Ninth Revision, Clinical Modification diagnoses and
Current Procedural Terminology codes for lumbar arthrodesis
(Tables 1, 2). [8, 8]
The database had 3138 workers with lumbar fusion and
dates of injury between January 1, 1999 and December 31,
2001. “Date of injury” is the date on which a work-related
injury occurred. Subjects with lumbar fusion after the cutoff
date of July 31, 2003, and/or having injuries to other body
parts in addition to the lumbar spine were excluded. A total
of 725 lumbar fusion cases were eligible for the study. There
were 10,518 nonoperated, CLBP subjects with similar injury
dates and low back pain International Classification of
Diseases, Ninth Revision, Clinical Modification diagnoses
(Table 1). Subjects with spinal fracture, involvement of other
body parts, cervical and/or thoracic areas, head trauma, or
pregnancy were excluded. After exclusion due to involvement
of other body parts and controlling for age, gender, and diagnoses,
3587 eligible controls remained. From this pool, 725
controls were selected randomly by computer (Figure 1).
This study design did not require direct contact with study
subjects. The lost to follow-up rate was 1.4% due to lack of
RTW status of 21 subjects (7 cases and 14 controls). Follow-up
mean duration was 4.78 years for cases and 3.46 years for
controls. The study ended on January 31, 2006.
ICD-9 CM Diagnoses
for Low Back
Categorize the Types of
Subjects selection for
Primary and Secondary Outcomes Measured
The primary outcome was RTW status. The secondary outcomes
were permanent disability award, complications, reoperations,
and opiate utilization.
RTW was considered successful if the injured worker
returned to employment 2 years after the date of surgery
for cases or 2 years after injury for controls as part-time,
full-time work ers with the same or a different employer.
Unsuccessful RTW was defined as failure to RTW in any
capacity. Disability status was defined as workers who were
awarded permanent total disability status after surgery or
after injury. Permanent total disability is permanent lifetime
Complications were classified as early major systemic (<6
weeks postoperative), neurologic, implant, late spinal, or
wound complications. 
Reoperation was defined as repeat lumbar surgical
procedure(s) performed during the follow-up period. These
repeat surgical procedures included the following: fusions,
removal and/or insertion of fixation device(s), laminectomy,
bone grafts, explora tion, and decompression of the lumbar
spine. [11, 12]
Opioid utilization was limited to the oral route. For each
oral narcotic analgesic, the date, name, dose, and quantity dispensed
were converted to morphine equivalent units (MEQ).
Cumulative dose per day was calculated. Average amount of
opioids before surgery, after surgery, and during the entire
length of the study were determined. 
Mortality status was categorized as perioperative mortality
(i.e., within 6 weeks postoperative) and long-term mortality
from any cause. [14, 15]
RTW rates among lumbar fusion subjects have been
reported as 41% to 78%. [2, 4] A sample size of 250 cases and
250 controls provided an alpha (2–sided) of 0.05 (Type I error)
and beta value of 0.14 (Type II error). This sample size
provided 86% power to detect a 10% difference between
the surgical fusion cases and nonsurgical controls. This
was a conservative estimate of the case-control difference. 
Baseline characteristics of the cohorts were compared
using χ2 tests, frequencies, and percentages for categorical
variables. T tests, means, and standard deviations were
reported for continuous variables. Independent variables
included age, gender, diagnoses, smoking history, weekly
wages, legal representation, marital status, education, total
days off, number of days from the date of injury to date
of surgery, number of reoperations, complications, lumbar
magnetic resonance imaging (MRI) findings, number of
vocational and rehabilitation sessions, body mass index
(BMI), daily opioid dose, fusion approaches, and discogram
performance. The above covariates were included in
the regression models because they have been reported in
the literature to affect the outcomes of interest. [17–27] Stepwise
logistic regression (LR) was performed to determine
the magnitude of association of the independent variables
in predicting RTW. Unadjusted and adjusted odds ratios
(OR) are presented with 95% confidence intervals (CIs).
No statically important interactions were found. The final multivariate models were determined based on clinically
meaningful and statistically significant predictors, high concordance
indexes, and the Hosmer and Lemeshow Goodness
of Fit test.
All analyses were performed using SAS software, version
9.1. Two-sided P values and 95% CIs are reported; P < 0.05
is considered to be statistically significant.
Demographics of all subjects are presented in Table 3. Legal
representation, current smokers, and female gender were
more common in the surgical cases than in the controls. Sex
was not a statistically significant predictor of RTW status in
unadjusted or adjusted LR analyses. Smoking status was better
documented for cases than controls secondary to cases
having longer care and thus more office visits. Cases had more
legal representation. Cases also had higher average preinjury
weekly wages compared to controls. Age, BMI, education,
and marital status were not statistically significant between
the 2 groups. Approximately 72% of the diagnoses for all
subjects were disc degeneration and disc herniation. About
80% of cases and 70% of controls had 1 or 2 levels of degenerative
disc changes on MRI (Table 3). Lumbar MRI findings
and diagnoses were not statistically significant predictors of
the adjusted RTW status.
After considering subjects who were dead (17 cases, 11
controls), permanently disabled (82 cases, 11 controls) or in
rehabilitation at 2 years (64 cases, 43 controls), the actual
RTW status at 2 years was 26% (n = 188) of cases and 67%
(n = 483) of controls. Surgical cases remained off work longer
than controls 1140 days versus 316 days, respectively
(P < 0.001). The average duration from the date of injury
to the date of surgery was 597 days. This duration was not
significant in the RTW adjusted analysis (Table 4).
There were 264 cases (36%) with surgical complications.
Frequencies and definitions of complications are provided in
Table 5. Complication frequency was high because of the inclusion
of late spinal complications. This group made up 25%
of all complications. Most late spinal complications consisted
of post laminectomy syndrome and adjacent segment degeneration.
The ranges of wound, im plant, neurologic, and early
complications were 2% to 6%. Of the surgical subjects, 64%
had no complications.
Lumbar reoperations occurred in 27% of the cases (n = 194).
About 66% (n = 160) of the reoperations occurred within 2
years of the index surgery. A large number of reoperations
consisted of removal of instrumentation, re-exploration, and
additional arthrodesis (Table 5). Complications and reoperations
will be further investigated in subsequent article.
of Lumbar Fusion Cases and
Return to Work,
and Death Status
Throughout the entire study, 85% (n = 614) of the lumbar
fusion cases were using opioids compared to 49% (n = 354)
of controls. The average daily MEQ increased from 44.23 ± 33.57 U before surgery to 62.31 ± 70.80 U after surgery.
There is a 41% increase in the mean daily opioid dosage postoperatively.
The average daily, postsurgery MEQ reported is
the amount of opioid taken more than 90 days postoperatively
(Table 5). In both the univariate (P < 0.001) and the
multivariate (P = 0.03) LR analysis, the daily MEQ was a
significant negative predictor of fusion cases having successful
RTW (Tables 6, 7).
Unadjusted LR indicated a number of factors were significant negative predictors of RTW status at 2 years postfusion
(Table 6). Complications as a group affected RTW status significantly
(P < 0.001). More specifically, RTW chances were early
major systemic complications OR, 0.22 (95% CI, 0.08–0.64;
P = 0.005); implant complications OR, 0.07 (95% CI, 0.009–
0.53; P = 0.01); late spinal complications OR, 0.49 (95% CI,
0.31–0.77; P = 0.002); and neurologic complications OR,
0.42 (95% CI, 0.09–2.06; P = 0.29). Neurologic and wound
complications were not statistically significant (Table 6). This
finding persisted in the adjusted LR analysis (Table 7).
Regression of Return
to Work Status
Final Multivariate Logistic
Regression Models of Return
to Work Status
Subjects who had reoperations once after the index fusion had
a RTW OR, 0.28 (95% CI, 0.17–0.48;P < 0.001) compared
to subjects with no reoperation (Table 6).
The total number of days off work was a highly significant
negative predictor of RTW in fusion cases and in nonoperated
controls, in both adjusted and unadjusted F2 models
(Figure 2). At 30 days of work absence, the unadjusted OR
for RTW in fusion cases was 0.93 (95% CI, 0.92–0.94;
P ≤ 0.001) and for nonoperated controls was 0.85 (95% CI,
0.82–0.88; P ≤ 0.001) (Table 6).
Weekly wages was a strong predictor of RTW status for all
subjects. The higher the preinjury weekly wages, the F3 more
likely the individual was to RTW (Figure 3). A subject earning
$100.00 more per week had an increased odds of RTW (OR,
1.09; 95% CI, 1.01–1.18; P < 0.02) (Table 7).
Total days off work as predictor
of return to work status.
Weekly wages as predictor
of return to work status.
Both current smoking and legal representation were significant negative predictors of RTW in univariate and multivariate
analyses. Cases without legal representation were
3 times more likely to RTW OR 3.43 (95% CI, 1.58–7.41;
P < 0.002) (Table 7).
The more rehabilitation sessions (therapy) provided, the
less likely cases and controls were to RTW. At 10 therapy
sessions, the RTW OR was 0.92 (95% CI, 0.87–0.97; P ≤
0.001) for fusion cases and 0.95 (95% CI, 0.93–0.98, P <
0.001) for controls. With 20 therapy sessions, the RTW OR
was 0.85 (95% CI, 0.76–0.94; P = 0.002) for cases and
0.91 (95% CI, 0.86–0.96; P < 0.001) for controls (Table 6).
Rehabilitation and vocational sessions were not statistically
significant predictors of RTW in the final adjusted
Age, BMI, diagnoses, education, surgical fusion approach,
sex, marital status, the number of lumbar levels with degenerative
changes, and the number of vocational sessions were not significant predictors of RTW in either adjusted or unadjusted analysis.
The final adjusted LR model indicated current smoking,
the number of total days off work, and weekly wages were
significant predictors of RTW status with OR, 0.65 (95%
CI, 0.42–1.01; P = 0.05); OR, 0.93 (95% CI, 0.92–0.94; P ≤ 0.001); and OR, 1.09 (95% CI, 1.01–1.18; P = 0.02) for the entire cohort, respectively (Table 7).
Multivariate analysis of only fusion cases showed
the complications OR, 0.25 (95% CI, 0.07–0.90;
P = 0.03); reoperation status OR, 0.42 (95% CI, 0.26–
0.69; P ≤ 0.001); total days off before surgery OR,
0.94 (95% CI, 0.92–0.97; P < 0.001); legal representation
OR, 3.43 (95% CI, 1.58–7.41; P = 0.002); and
total daily MEQ OR, 0.83 (95% CI, 0.71–0.98; P = 0.03) as significant negative
predictors of RTW, while higher average weekly wages
remained a predictor of increase chances of RTW OR, 1.12
(95% CI, 1.03–1.21; P = 0.008) (Table 7).
Similar to surgical patients, age, BMI, diagnosis, education,
sex, marital status, MRI findings, and vocational training
were not significant predictors of RTW status in both unadjusted
and adjusted LR analysis for nonsurgical controls. Legal
representation, current smoking, and total rehab sessions
were significant predictor of RTW status in only unadjusted
analysis. These effects did not persist in the adjusted analysis
for controls (Table 6).
Nonsurgical controls adjusted LR model showed only the
total number of days off, and weekly wages were significant
predictors of RTW. The longer the duration off work the less
likely a subject was to RTW with an OR, 0.85 (95% CI,
0.82–0.88; P < 0.001). Weekly wages continued to show
the same trend as cases. Higher wages increased the odds of
RTW OR 1.16 (95% CI, 1.02–1.32; P = 0.02).
Lumbar fusion is a controversial operation for degenerative
disc disease and herniated disc. [5, 6] It is most commonly performed
in the United States for the diagnosis of degenerative
disc disease. [5, 28] A large population study of workers’ compensation
lumbar fusion subjects with multiple objective outcomes
and randomly selected controls has not been published.
In this study, we evaluated RTW, disability, complications,
reoperations, and opioid usage among cases and randomized
controls. RTW is an important objective personal health outcome,
as multiple studies have shown that being out of work
is associated with poor health. Employment not only provides
needed income, it is a part of the individual’s self image and
socioeconomic status. Being out of work or being disabled from
work also has an important societal impact. Unemployment
has been associated with cardiovascular disease, cancer, suicide,
poverty, increase of spousal and child abuse, domestic violence,
divorce, and higher utilization of healthcare services. [29–35] RTW
is, and should be, an objective end point for treatment provided
in a workers’ compensation setting.
This study showed surgical fusion cases were more likely to
be permanently disabled (n = 82 vs. n = 11, P = 0.001) and
more likely to not RTW than the nonsurgical controls (n =
367 vs. n = 163, P < 0.001). Combining the permanently disabled
with surgical cases who failed to RTW, yielded a 62%
disability status (n = 449). This result is consistent with the
disability status reported from the Washington state workers’
compensation data base as 68% in 1994  and 64% in 2006. 
The average age for all subjects in the study was 39 years
old, and these were healthy working individuals at the
time of injury. The complications was high compared to
Maghout-Juratli et al study  secondary to including long-term
“late” spinal and neurologic complications. Adjacent segment
degeneration and post laminectomy syndrome made
up to 72% of the late spinal complications. Most lumbar
surgical studies include only short-term complications (i.e.,
within 6 weeks after fusion). As a result, late spinal complications
are seldom reported. Without the late spinal and
neurologic complications, our complications rate of 15%
(early major systemic, implant and wound complications) is
comparable to Maghout-Juratli’s short-term complication
rate of 12% (Table 5).
Reoperation rates have been reported consistently by Utah
and Washington states in the past, 20% and 22%, respectively. [2, 1, 4] Utah’s reoperation rate was self reported. Both Washington
studies reported reoperation rates within 2 years of the index
surgery. [1, 4] The reoperation rate was slightly higher (27%) in
this study because reoperation was tracked until the end of the
study. However, the reoperation rate was 22% if the reoperation
was only considered within 2 years of the index surgery.
Lumbar spine fusion does not seem to be an effective
operation for the workers’ compensation subjects with the
diagnoses of disc degeneration, disc herniation, and/or radiculopathy.
Our data indicate 84% of the diagnoses for the
surgical patients were disc degeneration, disc herniation, and
radiculopathy (Table 3). These diagnoses remain controversial
indications for lumbar fusion, while subjects with spondylolisthesis
with instability, traumatic fractures, or tumor have
had good results. Lumbar arthrodesis should be cautiously
considered and recommended only in workers’ compensation
subjects with clear cut indications.
The best lumbar arthrodesis approach (posterior, anterior,
or combined), technique (noninstrumented, instrumented, etc.),
and single or multi-levels remain debatable in the spine literature.
Our analyses indicated the type of surgery performed was
not a statistically significant predictor of RTW status (Table 6).
It is important to note that 5 of the 8 factors that remained
statistically significant in the final multivariate analysis are
psychosocial variables including current smoking status, total
days off, the number of days off before surgery, weekly wages,
and legal representation (Table 7). [36–40]
The only clinical findings that remained significant in predicting
RTW status were complications, reoperations, and daily
MEQ. Similar to other studies, clinical factors of preoperative
diagnoses, lumbar MRI findings, fusion types, the number of
rehabilitation, or vocational sessions were not statistically significant and did not appear to be associated with RTW status. [1, 2]
Total number of days off was the most important predictor
of RTW status irrespective of surgical or nonsurgical
treatment. This variable is distinct from another variable that
measured the duration from the date of injury to the date of
surgery; the latter was not statistically significant.
Thus, time off work (or time off work before surgery) and
not time from injury to surgery was the predictive variable.
The number of days off work remained highly significant
in unadjusted and adjusted analyses of cases only, controls
only, and the entire cohort. At 2 years off work, the odds
that fusion cases would RTW were 0.16 (95% CI, 0.12 0.22;
P ≤ 0.001). This effect appears to be even more important in
controls. Controls’ odds of RTW were 0.02 (95% CI, 0.009–
0.05; P ≤ 0.001) (Figure 2). Controls with prolonged days
off work had much smaller chances of RTW compared to
cases. It should be noted that none of the medical factors were
statistically significant predictors of RTW status in the final
adjusted model for controls (Table 7).
Similarly, the number of days remaining off work before
surgery was a significant predictor of RTW status. The
longer the duration the subject remain off work before surgery,
the less likely the chances of RTW success fully. At 90 days off work before surgery, the odds of RTW were 0.83 (Table 7).
At least 76% (n = 550) of the fusion cases were still taking
opioids more than 90 days after surgery with average daily
MEQ increased by 41%. The daily MEQ reported reflect an
underestimate of the opioid dose because only oral opioids
with reliable conversion to morphine were used to calculate
daily total MEQ. Nasal sprays, transdermal, and parenteral
routes of opioid administration were not included in this
study. This outcome questions lumbar fusion effectiveness in
relieving low back pain and the validity of the self-reported
pain scores and functional questionnaires that have been used
for years as a part of the measurement of the effectiveness of
low back pain interventions. Figure 4 shows the ORs between
opioid dose and RTW. This graph demonstrates the profound
association of opioid use on RTW status with far greater impact
on cases, as opposed to controls. The greater the daily
total amount of opioids, the less likely it was for a worker
to RTW. The odds of RTW dropped sharply with small increases
in the dose of opioids. At 100 MEQ units, the OR
of RTW for cases was 0.25 (95% CI, 0.14–0.46; P < 0.001)
compared to the controls’ OR of 0.93 (95% CI, 0.68–1.28,
P < 0.65). Many other studies published previously have also
suggested long-term opioid therapy for noncancer pain may
not be in a patient’s best interest. [41–46] Continued usage of opioids
in the workers’ compensation system without long-term
randomized trials and/or large population studies is not recommended
in light of these findings.
Total morphine equivalents
as predictor of return to work ststus.
The association of wages and RTW status is seldom
addressed in the medical literature. In this study, weekly
wages was a significant predictor of RTW status in both
univariate and multivariate LR analysis for all subjects
(Tables 6, 7).
The higher the weekly wages, the more likely an injured
worker was to RTW. Patients with higher incomes may have
more incentive to RTW, or may have more employment options,
as higher wages often suggests more marketable job skills.
Finally, similar to previous studies, this study showed that
legal representation was a strong negative predictor of RTW in
both cases (OR, 3.98; 95% CI, 2.17–7.30; P < 0.001) and nonsurgical
controls (OR, 5.83; 95% CI, 3.14–10.83; P < 0.001). [1, 2, 47]
This study has several limitations. Not all risk factors that
may affect the surgical outcomes are documented consistently
in the database (i.e., smoking history). Although numerous
independent factors have been collected, it is possible that
there are other significant but unconsidered factors. An historical
cohort study design is not the best method to evaluate
the effectiveness of surgical intervention. However, this study
has many advantages. The study design permits a prolonged
follow-up in a very large cohort with multiple objective outcomes
measured. Using objective outcomes eliminates difficulties associated with self-reported questionnaires of pain
and function. Data are collected from medical providers
throughout the state of Ohio, and unlikely to be affected by
referral pattern bias.
Our results are very similar to Washington state studies. [1, 4]
Randomized controlled trials specifically for workers’ compensation
subjects with lumbar fusion should be performed.
In summary, this large historical cohort study suggests that
lumbar fusion may not be an effective operation in workers’
compensation patients with the diagnoses of disc degeneration,
disc herniation, and/or radiculopathy. This procedure is
offered to improve pain and function, yet objective outcomes
showed increased permanent disability, poor RTW status, and
higher doses of opioids. The combination of lumbar fusion
surgery for disc degeneration, disc herniation and/or radiculopathy,
opiates, prolonged work absence, and legal representation
appear to create a diminished quality of life for the
injured workers under these circumstances. Additional studies
are currently underway to further investigate these factors.
Workers’ compensation subjects with lumbar arthrodesis had a poor RTW status 2 years after surgery, higher disability status, and a larger number of subjects continued on daily opioids compared to nonsurgical controls. significant predictors of RTW status for surgical cases were the number of days off, legal representation, weekly wages, complications, reoperations, and total morphine usage. Number of days off and weekly wages were the only significant predictors of RTW status for nonsurgical controls.
Legal representation decreased the odds of the injured worker returning to work.
The use of opiates decreased the odds of RTW significantly for surgical subjects.
Control subjects with prolonged work absence have poorer odds of RTW compared to surgical cases.
The authors thank K. Nguyen, D. Hubbard, and C. Krabacher
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