Patient perceptions on physician reimbursement in plastic surgery.

BACKGROUND: Public perception on physician reimbursement may be that considerable payments are received for procedures: a direct contrast to the actual decline. We aim to investigate patient perceptions toward plastic surgeon reimbursements from insurance companies. METHODS: A survey of 4 common, single-staged procedures was administered to 140 patients. Patients were asked for their opinion on current insurance company reimbursement fees and what they believed the reimbursement fee should be. RESULTS: Eighty-four patients completed the survey. Patients estimated physician's reimbursements at 472% to 1061% more for breast reduction, 347% to 770% for abdominal hernia reconstruction, 372% to 787% for panniculectomy, and 290% to 628% for mandibular fracture repair. Despite these perceived higher-than-actual-fee payments, 87% of patients thought reimbursements should still be higher. CONCLUSIONS: Patients surveyed overestimated plastic surgery procedure fees by 290% to 1061%. Patients should be informed and educated regarding current fee schedules to plastic surgeons to correct current misconceptions.

A multimodal approach for postoperative pain management after lumbar decompression surgery: a prospective, randomized study.

STUDY DESIGN: A prospective and randomized study. OBJECTIVES: The objective of this study was to assess the efficacy of a novel multimodal analgesic regimen in reducing postoperative pain and intravenous morphine requirements after primary multilevel lumbar decompression surgery. SUMMARY OF BACKGROUND DATA: The use of opioid medications after surgery can lead to incomplete analgesia and may cause undesired side effects such as respiratory depression, somnolence, urinary retention, and nausea. Multimodal (opioid and nonopioid combination) analgesia may be an effective alternative to morphine administration leading to improved postoperative analgesia with diminished side effects. METHODS: After Institutional Review Board approval, 22 patients who underwent a primary multilevel lumbar decompression procedure were randomly assigned to receive either only intravenous morphine or a multimodal (celecoxib, pregabalin, extended release oxycodone) analgesic regimen. Postoperatively, all patients were allowed to receive intravenous morphine on an as needed basis. Intravenous morphine requirements were then recorded immediately postoperative, at 6, 12, 24 hours, and the total requirement before discharge. Patient postoperative pain levels were determined using the visual analog pain scale and were documented at 0, 4, 8, 12, 16, 24, and 36 hours postoperative. RESULTS: There were no significant differences in available patient demographics, intraoperative blood loss, or postoperative hemovac drain output between study groups. Total postoperative intravenous morphine requirements in addition to morphine requirements at all predetermined time points were less in patients randomized to receive the multimodal analgesic regimen. Visual analog pain scores were lower at all postoperative time points in patients randomized to receive the multimodal analgesic regimen. Time to solid food was significantly less in the multimodal group. There were no major identifiable postoperative complications in either treatment group. CONCLUSIONS: Opioid and nonopioid analgesic combinations appear to be safe and effective after lumbar laminectomy. Patients demonstrate lower intravenous morphine requirements, better pain scores, and earlier time to solid food intake.

Tandem stenosis: a cadaveric study in osseous morphology.

BACKGROUND: Tandem stenosis is the occurrence of concurrent cervical and lumbar stenosis. The prevalence has been estimated to be from 5% to 25%. Symptomatic tandem stenosis can present with a confusing scenario of both neurogenic claudication and myelopathy symptoms. PURPOSE: The purpose of this study was to determine 1) the prevalence of anatomic tandem stenosis in a cadaveric population, 2) if there was an associative relationship between lumbar and cervical stenosis, and 3) the positive predictive values of stenosis in one area for stenosis in the other. STUDY DESIGN: We obtained 440 skeletally mature skeletons and examined the cervical and lumbar spines from the Hamann Todd Collection in the Cleveland Museum of Natural History. METHODS: For the cervical spine, we measured the mid-sagittal canal diameter using digital calipers for every level from C3 through C7. The minimum full central sagittal diameter was recorded for each level. For the lumbar spine, we measured the minimum full mid-sagittal canal diameter for every level from L1 through L5, using digital calipers. Stenosis was defined as a mid-sagittal canal diameter of less than 12 mm at at least one level. After analysis of this data, a second analysis was performed after correcting the data for contemporary body size and radiographic manifestation. RESULTS: The prevalence of tandem stenosis ranged from 0.9% to 5.4% in this population. The association of cervical and lumbar stenosis was found to be statistically significant (p < .05). Stenosis in one part of the spine positively predicts for stenosis in the other area of the spine 15.3% to 32.4% of the time. CONCLUSION: Tandem stenosis should be considered when evaluating a patient with mixed claudication and myeloradiculopathy symptoms.

Prevalence of cervical spine stenosis. Anatomic study in cadavers.

BACKGROUND: The sagittal diameter of the cervical spinal canal is of clinical importance in traumatic, degenerative, and inflammatory conditions. A small canal diameter has been associated with an increased risk of injury; however, there is a lack of reliable normative data on spinal canal diameters in different age groups in the United States population. The purpose of this study was to use direct measurement of skeletal specimens to determine the spectrum of the sagittal diameters of the cervical spinal canal, the frequency of cervical stenosis in the general population, and the prevalence of cervical stenosis for different age groups, races, and sexes. METHODS: Four hundred and sixty-nine adult skeletal specimens of the cervical spine were obtained from the Hamann-Todd Collection in the Cleveland Museum of Natural History. With use of digital calipers, the distance from the posteriormost aspect of the vertebral body to the anteriormost aspect of the spinolaminar structure was measured and recorded for each specimen at every level from C3 to C7. Cervical stenosis was defined as a canal diameter of <12 mm. We analyzed the direct measurements and then assessed those data after correcting for size increases in the current population compared with the Hamann-Todd Collection. Finally, we analyzed the data after both that size correction and adjustment for radiographic magnification. RESULTS: The average anterior-posterior canal diameter (and standard deviation) in all specimens at all levels was 14.1 +/- 1.6 mm. The canal diameters ranged from 9.0 to 20.9 mm, with a median diameter of 14.4 mm. Men had significantly larger cervical spinal canals than women at all of the levels that were evaluated. Specimens from donors who were sixty years of age or more at the time of death had significantly narrower canals than specimens from younger donors. There were no significant differences, with the numbers available, between black and white groups. After correcting for increased body size and adjusting for radiographic magnification, we estimated that cervical stenosis was present in 4.9% of the adult population, 6.8% of the population fifty years of age or older, and 9% of the population seventy years of age or older. CONCLUSIONS: Cervical spine stenosis appears to be very common. The radiographic finding of cervical stenosis should therefore be correlated with the clinical presentation prior to decision-making regarding treatment.

Prospective clinical outcomes of revision fusion surgery in patients with pseudarthrosis after posterior lumbar interbody fusions using stand-alone metallic cages.

BACKGROUND CONTEXT: Posterior lumbar interbody fusion (PLIF) is a popular method of arthrodesis for surgical treatment of instabilities and degenerative conditions of the spine. With the introduction of threaded titanium cage devices, surgeons began performing PLIF procedures using these cages as stand-alone devices. Complications have been reported, however, including pseudarthrosis with persistent pain. Outcomes after revision surgical treatment for these patients with failed PLIF are not known. PURPOSE: To prospectively evaluate clinical outcomes of revision fusion surgery in patients who previously underwent posterior lumbar interbody fusion with stand-alone metallic cages resulting in pseudarthrosis. STUDY DESIGN/SETTING: Prospective case series. METHODS: Nineteen patients referred to the senior author were evaluated and diagnosed with pseudoarthrosis having previously undergone a PLIF procedure with stand-alone metallic cages. History, physical exam, and imaging studies were performed preoperatively and postoperatively. All underwent revision posterolateral fusion with iliac crest graft and pedicle screw instrumentation. Patient demographics, SF-36, and Oswestry Disability Index (ODI) data were collected prior to surgery and two years postoperatively. RESULTS: Patients undergoing revision fusion surgery were found to have had extensive facetectomies and pseudarthrosis intraoperatively. Outcomes data was collected on eighteen of nineteen patients (95%). Mean clinical follow up was 3.2 years (range 2.5-3.5 years). Seventeen patients (94%) achieved a solid fusion. Improvement was noted in seven of eight SF-36 sub-categories, but was significant only in two (Physical Function and Role Emotional). There was no significant difference in ODI scores. CONCLUSIONS: Pseudarthrosis should be considered in the differential diagnosis if severe symptoms persist in patients who undergo PLIF with stand-alone metallic cages. Successful revision fusion did not always correlate with improved clinical outcomes in these challenging patients undergoing further surgery. Performing PLIF using stand-alone metallic cages, especially after total resection of the facet joints, is not advocated unless supplemental instrumentation is utilized.

Spica cast application in the emergency room for select pediatric femur fractures.

OBJECTIVES: This study was designed to evaluate the efficacy and safety of immediate spica casting in the emergency room (ER) and evaluate the effect of discharge from the emergency room on short- term complications. DESIGN: Retrospective review of patients treated with immediate spica casting in the ER between June 1, 1993 and July 30, 2001. SETTING: Major, pediatric, orthopaedic trauma and referral center. PATIENTS: A total of 145 pediatric femur fractures in children, younger than age 7 years, treated with immediate spica casting in the ER were reviewed to determine radiographic outcome and short-term complication rates. INTERVENTION: All patients underwent immediate spica cast placement in the ER under conscious sedation. Patients meeting specific criteria were discharged immediately from the ER. MAIN OUTCOME MEASUREMENTS: Radiographic acceptability of alignment at fracture union (angulation, shortening), loss of reduction, number of return visits to the emergency room, and clinical outcome at final follow-up. RESULTS: Average follow-up was 20 +/- 16 weeks (range, 1-9 months). Forty-eight patients (33%) were discharged from the ER. No clinical complications were noted at last follow-up. All children younger than age 2 years, and 86.5% of children ages 2 to 5 years, met acceptable malalignment parameters on final radiographs. There were 16 ER visits (11%) for cast problems. Re-reduction in the operating room was needed in 11 patients (8.9%); 6.9% of patients had a cast problem noted during follow-up visits. Only 9% of patients developed a major complication. Initial shortening was the only independent risk factor found to be associated with loss of reduction. Admission status had no significant effect on the number of ER visits or development of a complication. CONCLUSIONS: If there are no associated factors requiring admission (ie, child abuse or polytrauma), spica casting in the ER for pediatric femur fractures followed by immediate discharge can be safely performed with a low complication rate in children younger than age 6 years, nearly eliminating the need for general anesthesia.

Detection of postoperative neurologic deficits using somatosensory-evoked potentials alone during posterior cervical laminoplasty.

BACKGROUND CONTEXT: The use of neurophysiologic monitoring during anterior and posterior cervical decompression procedures in patients with spondylotic myelopathy remains controversial. The ideal neurophysiologic monitoring modality of choice is also highly debated. PURPOSE: The purpose of this study was to evaluate the utility of neurophysiologic monitoring with only somatosensory-evoked potentials (SSEPs) in a consecutive series of laminoplasty procedures with regard to the detection of new postoperative neurologic deficits. STUDY DESIGN: Retrospective case series. PATIENT SAMPLE: Eighty consecutive patients who underwent a posterior cervical laminoplasty were reviewed. OUTCOME MEASURES: We analyzed intraoperative SSEP amplitude and latency changes from baseline with regard to the development of new postoperative neurologic deficits. METHODS: We retrospectively reviewed 80 patients who underwent a posterior cervical "open-door" laminoplasty with a standard SSEP neurophysiologic monitoring protocol. Intraoperative SSEP amplitude and latency changes from baseline ("alerts") were analyzed with regard to the development of new postoperative neurologic deficits. RESULTS: Baseline SSEP values were obtained in all patients. There were five (6%) procedures that had SSEP alerts. All alerts occurred shortly after the lamina was hinged open. Four patients with SSEP alerts developed new postoperative neurologic deficits, including three unilateral upper extremity motor and sensory deficits and one complete spinal cord injury. In the immediate postoperative period, our experience with SSEP monitoring demonstrated 4 true-positive, 75 true-negative, and 1 false-positive monitoring results. CONCLUSIONS: In this series of laminoplasty procedures, SSEP neurophysiologic monitoring had a high sensitivity and specificity for predicting new neurologic deficits in the early postoperative period. Somatosensory-evoked potentials are an effective tool for spinal cord monitoring when performing a posterior cervical laminoplasty procedure.

Correlation between computed tomography measurements and direct anatomic measurements of the axis for consideration of C2 laminar screw placement.

BACKGROUND: C2 laminar screws are becoming an increasingly used method of fixation. They allow for avoidance of fixation through the C2 pedicle, eliminating the risk of vertebral artery injury. Recent studies have described the anatomic considerations of this technique in a large cadaveric population. In clinical practice, however, direct measurement is impractical and preoperative imaging must be relied upon to determine whether or not this technique can be safely used. PURPOSE: To evaluate the ability of computed tomography (CT) to accurately assess critical dimensions of the C2 vertebrae with regard to intralaminar screw placement. STUDY DESIGN/SETTING: Cadaveric analysis. METHODS: The C2 vertebrae of 84 adult spines were randomly selected from a large cadaveric collection. Direct measurements were performed to determine laminar thickness, estimated screw length, and spinolaminar angle. Fine cut axial CT scans were then performed on all specimens and all measurements were repeated from these images. Correlation coefficients were calculated to determine the ability of CT scan to accurately determine these measurements. RESULTS: CT scan measurements were found to be highly correlated with direct measurements for both left and right mean laminar thickness (0.975 and 0.947, respectively). Screw lengths using CT scan were found to be significantly longer than previously reported direct measurements (24.8 vs. 28.8mm; p<.01). The mean CT spinolaminar angle was 42.45 degrees, whereas it was 48.47 degrees on direct measurement. Correlation coefficient for spinolaminar angle measurements was low (0.23); however, this is likely because of measurement variability. CONCLUSIONS: Given the high degree of correlation between CT measurements and direct anatomic measurements, we conclude that CT scan can accurately determine laminar thickness, a measurement critical to safe placement of intralaminar screws. It appears that longer screw lengths that were previously reported may be safely used while remaining intra-osseous. We continue to advocate preoperative planning using CT to identify patients whose lamina may be unable to accommodate safe screw placement using this technique.

Degenerative spondylolisthesis of the cervical spine: analysis of 58 patients treated with anterior cervical decompression and fusion.

BACKGROUND CONTEXT: Degenerative spondylolisthesis has been well described as a disorder of the lumbar spine. Few authors have suggested that a similar disorder occurs in the cervical spine. To our knowledge, the present study represents the largest series of patients with long-term follow-up who were managed surgically for the treatment of degenerative spondylolisthesis of the cervical spine. PURPOSE: To describe the clinical presentation and radiographic findings associated with degenerative cervical spondylolisthesis, and to report the long-term results of surgically managed patients. STUDY DESIGN: Analysis of 58 patients treated with anterior cervical decompression and fusion for degenerative spondylolisthesis of the cervical spine. PATIENT SAMPLE: From 1974 to 2003, 58 patients were identified as having degenerative spondylolisthesis of the cervical spine occurring in the absence of trauma, systemic inflammatory arthropathy, or congenital abnormality. These patients were identified from a database of approximately 500 patients with degenerative cervical spine disorders treated by the senior one of us. OUTCOME MEASURES: Patient outcomes were evaluated with regard to neurologic improvement (Nurick grade myelopathy) and osseous fusion. METHODS: The records of 58 patients were reviewed. The average follow-up period was 6.9 years (range, 2-24 years). Seventy-two cervical levels demonstrated spondylolisthesis. In all cases, there was radiographic evidence of facet degeneration and subluxation. All patients were treated with anterior cervical decompression and arthrodesis with iliac crest structural graft. This most commonly involved corpectomy of the caudal vertebrae. Three patients required additional posterior facet fusion. RESULTS: Fifty-eight patients demonstrated 72 levels of involvement. The C4-C5 level was most frequently involved (43%). Two radiographically distinct types of listhesis were observed based on the amount of disc degeneration and the degree of spondylosis at adjacent levels. The average neurologic improvement was 1.5 Nurick grades. The overall fusion rate was 92%. Three patients were treated with combined anterior-posterior arthrodesis. The prevalence of myelopathy and instability pattern was greater in the listheses occurring adjacent to spondylotic levels. CONCLUSIONS: Degenerative spondylolisthesis is relatively common in the cervical spine. Common to all cases is facet arthropathy and neurologic compression. Anterior cervical decompression and arthrodesis appears to yield excellent union rates and neurological improvement in those patients having cervical degenerative spondylolisthesis and significant neurological sequelae who have failed nonoperative treatments.

Weight loss in overweight and obese patients following successful lumbar decompression.

BACKGROUND: Neurogenic claudication secondary to lumbar stenosis is often cited by overweight and obese patients as a factor limiting their ability to lose weight. Many patients believe that they will be able to increase their activity and subsequently lose weight following relief of symptoms. The objective of this study was to evaluate weight loss in overweight and obese patients who obtained substantial pain relief after lumbar decompression surgery for spinal stenosis. METHODS: Changes in the body weight and body mass index of overweight and obese patients after lumbar decompression surgery were assessed at a mean of 34.4 months postoperatively. Sixty-three patients (thirty-seven men and twenty-six women with a mean age of 53.4 years) were included in the study. Preoperative and postoperative body weight and body mass indices were calculated, and Zurich Claudication Questionnaire (ZCQ) Symptom Severity and Physical Function scores were obtained. RESULTS: The ZCQ Symptom Severity and Physical Function scores significantly improved, by a mean of 56.4% and 53.0%, respectively. At the time of follow-up, both the mean body weight and the mean body mass index significantly increased, by 2.48 kg and 0.83 kg/m(2), respectively. Overall, 35% of the patients gained >or=5% of their preoperative body weight, 6% of the patients lost >or=5% of their preoperative body weight, and 59% remained within 5% of their preoperative body weight. CONCLUSIONS: The majority of overweight and obese patients maintain or increase their body weight and body mass index following successful lumbar decompression surgery. Substantial relief of symptoms and functional improvements do not appear to help overweight or obese patients to lose weight. This suggests that obesity is an independent disease and not simply a function of symptomatic spinal stenosis, and patients should be counseled regarding these expectations.

Ketorolac use for postoperative pain management following lumbar decompression surgery: a prospective, randomized, double-blinded, placebo-controlled trial.

STUDY DESIGN: Prospective randomized double-blind placebo-controlled study. OBJECTIVE: The objective of this study was to assess the efficacy of Ketorolac in reducing postoperative pain and morphine requirements following primary multilevel lumbar decompression surgery. SUMMARY OF BACKGROUND DATA: The use of opioid medications following surgical interventions can be complicated by related side effects such as respiratory depression, somnolence, urinary retention, and delayed time to oral intake. The use of Ketorolac, a potent nonopioid, nonsteroidal anti-inflammatory drug, is an attractive alternative to morphine as many of the opioid-related side effects can be avoided. METHODS: After Institutional Review Board approval, 25 patients who underwent a primary multilevel lumbar decompression procedure were randomly assigned to receive either Ketorolac or placebo in a double-blinded fashion. After surgery, all patients were allowed to receive intravenous morphine on an as needed basis. Morphine requirements were then recorded immediately postoperative, at 6, 12, and at 24 hours postoperative. A patient's overall hospital course morphine requirement was also assessed. Patient postoperative pain levels were determined using the Visual Analog Pain Scale and were documented at 4, 8, 12, 16, 24, and 36 hours postoperative. RESULTS: There were no significant differences in available patient demographics, intraoperative blood loss, or postoperative Hemovac drain output between study groups. Morphine equivalent requirements were significantly less at all predetermined time points in addition to the overall hospital morphine requirement in patients randomized to receive Ketorolac. Visual Analog Pain Scores were significantly lower in patients randomized to receive Ketorolac immediately postoperative in addition to 4, 12, and 16 hours postoperative. There were no identifiable postoperative complications associated with the use of Ketorolac. CONCLUSION.: Intravenous Ketorolac seems to be a safe and effective analgesic agent following multilevel lumbar decompressive laminectomy. Patients can expect lower morphine requirements and better pain scores throughout their postoperative course.

Reherniation and failure after lumbar discectomy: a comparison of fragment excision alone versus subtotal discectomy.

STUDY DESIGN: Retrospective review of 259 lumbar discectomies. OBJECTIVE: To compare rates of reoperation after subtotal discectomy versus established rates after fragment excision. SUMMARY OF BACKGROUND DATA: Herniated nucleus pulposes (HNP) and annular morphology influence rates of reherniation after discectomy. Certain patterns are linked to reherniation rates exceeding 20%. METHODS: We retrospectively reviewed 259 single-level lumbar discectomies performed between 1980 and 2005. Mean follow-up was 60.9 months. In each case, annulotomy and subtotal discectomy was performed in addition to excision of disc fragments. HNP morphology was classified according to the 4-part system of Carragee (type 1: fragment/fissure; type 2: fragment/defect; type 3: fragment/contained; type 4: no fragment/contained). Fisher exact test was used to compare our proportion of patients with reherniation and/or reoperation to Caragee's series in which only fragment excision was performed. RESULTS: Of 259 cases, 12 (4.5%) reoperations were performed. A significant difference in failure/reoperation rate was noted in type 2 herniations. There was a significantly lower rate of failure and reoperation for type 2 HNP after subtotal discectomy (3.4%) when compared with fragment excision alone (21.2%), P<0.003. CONCLUSIONS: Subtotal discectomy is an acceptable technique that decreases reherniation after lumbar discectomy.

Risk factors for the development of perioperative complications in elderly patients undergoing lumbar decompression and arthrodesis for spinal stenosis: an analysis of 166 patients.

STUDY DESIGN: Retrospective review. OBJECTIVE: To quantify and describe perioperative complication rates in a large series of well-matched elderly patients who underwent lumbar decompression and arthrodesis. SUMMARY OF BACKGROUND DATA: Posterior lumbar decompression and fusion is frequently performed to treat lumbar stenosis with instability. An increasing number of elderly patients are undergoing operative treatment for degenerative lumbar disease. The reported morbidity of performing decompression and arthrodesis in this population varies widely in the literature, with recent reports showing a high rate of major complications. METHODS: A total of 166 patients age 65 or older that underwent primary posterior lumbar decompression and fusion with (group 1; n = 75) or without (group 2; n = 91) instrumentation were included. Hospital records were reviewed for the occurrence of any complications (major and minor), the need for transfusion, estimated length of stay, and disposition at discharge. Logistic regression (with the presence/absence of major complications as the dependent variable) was used to identify risk factors for the occurrence of a complication. RESULTS: Five major complications (3%) occurred (group 1, 1; group 2, 4). Minor complications developed in 30.7% of group 1 and 31.9% of group 2. There were no deaths, and only one perioperative complication was attributable to the use of instrumentation. Decompression/fusion of 4 or more segments was significantly associated with the occurrence of a major complication. Advanced age, the presence of medical comorbidities, or the use of instrumentation did not increase the rate of major or minor complications. The occurrence of either a major or minor complication prolonged hospital stay. CONCLUSIONS: Posterior lumbar decompression and fusion can be safely performed in elderly patients, with a low rate of major complications. The addition of instrumentation does not increase the complication rate. These results differ from those previously reported in the literature, which describe a significantly higher rate of complications in this age group, with a prolonged rate of hospitalization.

The surgeon as a consultant for medical device manufacturers: what do our patients think?

STUDY DESIGN: Patient survey. OBJECTIVE: To evaluate patient perspective on surgeons as consultants for industry and medical device manufacturers. SUMMARY OF BACKGROUND DATA: Relationships between surgeons and medical device manufacturers are becoming increasingly common. Little is known, however, about how patients perceive these relationships. METHODS: Patients in the waiting area of an orthopedic surgery clinic were given a simple 1-page, 8-question anonymous questionnaire. Their responses were tabulated and analyzed for 3 variables: gender, age, and education level. RESULTS: A total of 245 patients completed the questionnaire. An overwhelming majority (94.3%) believed that surgeon-industry relationship is beneficial to patients, and a majority (66.5%) of patients thought that physicians should be compensated for this role. Women were more likely than men to want this relationship to be regulated by physicians instead of the government or hospitals. Patients older than 55 years were less likely to be in favor of physicians being compensated than younger patients. The more educated the patient, the less likely he/she was in favor of allowing physicians to regulate physician-industry relationship. CONCLUSION: Patients support surgeons in the role of consultants for industry. Gender, age, and education level influence the way that patients perceive this issue.

Anatomic considerations for the placement of C2 laminar screws.

STUDY DESIGN: Cadaveric study. OBJECTIVE: To study the applicability of C2 laminar screw placement in the general adult population and to provide useful guidelines for their safe placement. SUMMARY OF BACKGROUND DATA: Laminar screws for fixation into the second cervical vertebra are becoming an increasingly used technique since they eliminate the risk of vertebral artery injury. Although it is being used clinically, there are no published data that describe the anatomic considerations and potential limitations of this technique in the general population. METHODS: The C2 vertebrae of 420 adult specimens were studied. Laminar thickness, spinolaminar angle, and the length from the spinolaminar junction to the contralateral lamina/lateral mass junction were measured. Statistical analysis was performed using unpaired Student t tests and regression analysis (P < 0.05). RESULTS: Mean laminar thickness was 5.77 +/- 1.31 mm; 70.6% of specimens had a laminar thickness > or =5 mm; 92.6% had a thickness > or =4.0 mm. The spinolaminar angle was 48.59 degrees +/- 5.42 degrees. The mean screw length that could be used was 2.46 +/- 0.23 cm. More than 99% of specimens had an estimated screw length of at least 20 mm. Gender had a significant effect on all of the measurements studied, but race, height, and weight did not. CONCLUSION: The majority of specimens can safely accept placement of a laminar screw. This study establishes anatomic guidelines to allow for accurate screw selection and insertion. Preoperative planning is essential for safe screw placement via this technique.

Cauda equina syndrome resulting from treatment of dural ectasia with fibrin glue injection.

The use of fibrin glue injection to treat symptomatic dural ectasia is controversial. A case of cauda equina syndrome following percutaneous fibrin glue injection is presented, followed by a review of dural ectasia and its possible treatments.