Sensitivity and specificity of patient-entered red flags for lower back pain.

BACKGROUND CONTEXT: Red flags are questions typically ascertained by providers to screen for serious underlying spinal pathologies. The utility of patient-reported red flags in guiding clinical decision-making for spine care, however, has not been studied. PURPOSE: The aim of this study was to quantify the sensitivity and specificity of patient-reported red flags in predicting the presence of serious spinal pathologies. STUDY DESIGN: This was a retrospective nested case-control study. PATIENT SAMPLE: This study consisted of 120 patients with International Classification of Diseases, Ninth Revision, Clinical Modification codes for spinal pathologies and 380 randomly selected patients, from a population of 4,313 patients seen at a large tertiary care spine clinic between October 9, 2013 and June 30, 2014. OUTCOME MEASURES: The presence of patient-reported red flags and red flags obtained from medical records was verified for chart review. The spinal pathology (ie, malignancy, fractures, infections, or cauda equina syndrome) was noted for each patient. METHODS: The sensitivity and specificity of patient-reported red flags for detecting serious spinal pathologies were calculated from data obtained from the 500 patients. Youden's J was used to rank performance. Agreement between patient-reported red flags and those obtained from medical record review was assessed via Cohen's kappa statistic. RESULTS: "History of cancer" was the best performing patient-reported red flag to identify malignancy (sensitivity=0.75 [95% confidence intervals, CI 0.53-0.90], specificity=0.79 [95% CI 0.75-0.82]). The best performing patient-reported red flag for fractures was the presence of at least one of the following: "Osteoporosis," "Steroid use," and "Trauma" (sensitivity=0.59 [95% CI 0.44-0.72], specificity=0.65 [95% CI 0.60-0.69]). The prevalence of infection and cauda equina diagnoses was insufficient to gauge sensitivity and specificity. Red flags from medical records had better performance than patient-reported red flags. There was poor agreement between patient red flags and those obtained from medical record review. CONCLUSIONS: Patient-reported red flags had low sensitivity and specificity for identification of serious pathologies. They should not be used in insolation to make treatment decisions, although they may be useful to prompt further probing to determine if additional investigation is warranted.

Membrane-Stabilizing Agents Improve Quality-of-Life Outcomes for Patients with Lumbar Stenosis.

Study Design Retrospective cohort controlled study. Objective To determine quality-of-life (QOL) outcomes for patients with lumbar spinal stenosis (LSS) treated with membrane-stabilizing agents (MSAs). Methods Patients with LSS and concordant neurogenic claudication treated with MSAs (n = 701) or conservatively without MSAs (n = 2104) at a single tertiary care hospital were identified. Patient QOL measures (Patient Health Questionnaire-9 [PHQ9], EuroQOL-5 Dimensions [EQ-5D], Pain Disability Questionnaire [PDQ]) were recorded pretreatment and then 4 months following treatment. Propensity score matching was used to account for baseline demographic differences between the two groups. The primary outcome measure was posttreatment improvement in these QOL measures. Results Patients in both groups had statistically significant improvements in the EQ-5D. However, the EQ-5D improvement in the MSA group was significantly greater than the improvement in the control group (0.11 versus 0.06; p = 0.0494). The EQ-5D change in the MSA group also exceeded the minimum clinically important difference, thereby suggesting a clinical significance. Both groups had significant pre- to posttreatment improvements in PDQ and PHQ-9, but these changes were not significantly different between the groups. Conclusion The results of this study suggest that patients with LSS and neurogenic claudication can have greater QOL improvements when treated with MSAs compared with other forms of conservative management without MSAs.

Depression as a predictor of worse quality of life outcomes following nonoperative treatment for lumbar stenosis.

OBJECT: The goal of this study was to determine whether pretreatment depression is predictive of quality of life (QOL) improvement for patients with lumbar spinal stenosis (LSS) who are treated conservatively. METHODS: This retrospective cohort study included patients with LSS and concordant neurogenic claudication who were treated nonoperatively at a single institution between September 2010 and March 2013. Patient QOL measures were recorded pretreatment and then 4 months after treatment. Pretreatment depression was assessed using the Patient Health Questionnaire-9 (PHQ-9). Successful outcome was defined as posttreatment improvement in EuroQol-5D (EQ-5D) index or in Pain and Disability Questionnaire (PDQ) scores. Regression analysis was performed to identify independent predictors of outcome while controlling for confounding variables. RESULTS: A total of 502 patients were included in the study. The average age for these patients was 66.1 years, with 51% female and 90.6% white. After adjusting for baseline demographic and clinical variables, there was a statistically significant association between baseline PHQ-9 score and posttreatment change in EQ-5D index (ß = -0.007, p = 0.0002). All other things being equal, a patient with a baseline PHQ-9 score of 0 (no depression) would be expected to improve in the EQ-5D index by 0.14 points (greater than the minimum clinically important difference) more than would a patient with a baseline PHQ-9 score of 20 (major depression). There was no significant association between baseline PHQ-9 score and change in Pain and Disability Questionnaire scores. CONCLUSIONS: When controlling for other baseline characteristics, severely depressed patients with LSS who are treated nonoperatively have significantly less improvement in their QOL compared with those with little or no depression. These data are similar to the negative predictive effects of depression on posttreatment QOL following lumbar fusion surgery.

Prediction of quality of life improvements in patients with lumbar stenosis following use of membrane stabilizing agents.

OBJECTIVE: Membrane stabilizing agents (MSAs) improves function and reduces neuropathic pain in a subset of patients with LSS. No study has investigated the pre-treatment demographic and psychosocial factors associated with quality of life (QOL) outcomes following the use of MSAs. In this study we sought to create prediction models for post-treatment outcome. METHODS: All patients who were diagnosed with LSS and treated with MSAs at a single institution between September 2010 and March 2013 were retrospectively reviewed. QOL outcomes were collected prospectively. Prediction tools were created using multivariable logistic regression and Cox proportional hazard models. Outcome measures were: 1 - need for surgery within 1 year after initiating MSA treatment, 2 - time until surgery after initiating MSA treatment, 3 - any improvement in EuroQol (EQ)-5D QOL index, 4 - improvement in EQ-5D index exceeding the minimum clinically important difference (MCID). RESULTS: 1346 patients were included. For goal 1 (need for surgery), the prediction model was less robust. For goal 2 (time to surgery), only age was a significant predictor, with each 10-year increase in age causing the hazard of eventually having surgery to increase by 20%. 382 patients were available for analysis for goals 3 and 4 (predicting improvement in EQ-5D). Prediction models for these goals were good with C-statistics 0.73 and 0.85, respectively. Predictive factors for superior outcomes included lower baseline EQ-5D index (worse QOL), less baseline depression, greater median income, and being married. CONCLUSION: MSA treatment provides improvements in quality of life for those individuals with LSS. Treatment effects of MSAs will be greatest in those with worse quality of life, less depression, married patients, and those of higher socio-economic status.

Ultrasound imaging of acute biceps tendon changes after wheelchair sports.

OBJECTIVES: To investigate acute changes in the biceps tendon after a high-intensity wheelchair propulsion activity and to determine whether these changes are related to subject characteristics. DESIGN: The biceps tendon was imaged with ultrasound before and after wheelchair basketball or quad rugby. The average diameter of the tendon was calculated as well as the echogenicity ratio (the pixel intensity ratio of the biceps tendon to a reference just superficial to the tendon sheath). SETTING: National Veterans Wheelchair Games in 2004 and 2005. PARTICIPANTS: Forty-two subjects who participated in wheelchair basketball or quad rugby at the Veterans Games. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Biceps tendon diameter and biceps echogenicity. RESULTS: The echogenicity ratio of the tendon significantly decreased from 1.97 to 1.73 after the event (P=.038). The diameter of the biceps tendon increased from 4.60 to 4.82 mm (P=.178). Also, it was found that the change in tendon diameter positively correlated with the time of play (P=.004). CONCLUSIONS: Acute changes in biceps tendon properties after exercise were found and likely represent edema, a first sign of overuse injury. The significance of continuous activity was shown by the fact that subjects who had more playing time showed a larger increase in tendon diameter.