The Decline of Small Practice in Colorectal Surgery: Practice Consolidation From 2015-2022.

INTRODUCTION: Physicians have gravitated toward larger group practice arrangements in recent years. However, consolidation trends in colorectal surgery have yet to be well described. Our objective was to assess current trends in practice consolidation within colorectal surgery and evaluate underlying demographic trends including age, gender, and geography. METHODS: We performed a retrospective cross-sectional study using the Center for Medicare Services National Downloadable File from 2015 to 2022. Colorectal surgeons were categorized by practice size and by region, gender, and age. RESULTS: From 2015 to 2022, the number of colorectal surgeons in the United States increased from 1369 to 1621 (+18.4%), while the practices with which they were affiliated remained relatively stable (693-721, +4.0%). The proportion of colorectal surgeons in groups of 1-2 members fell from 18.9% to 10.7%. Conversely, those in groups of 500+ members grew from 26.5% to 45.2% (linear trend P < 0.001). The midwest region demonstrated the highest degree of consolidation. Affiliations with group practices of 500+ members saw large increases from both female and male surgeons (+148.9% and +86.9%, respectively). New surgeons joining the field since 2015 overwhelmingly practice in larger groups (5.3% in groups of 1-2, 50.1% in groups of 500+). CONCLUSIONS: Colorectal surgeons are shifting toward larger practice affiliations. Although this change is happening across all demographic groups, it appears unevenly distributed across geography, gender, and age. New surgeons are preferentially joining large group practices.

Outpatient surgery benchmarks and practice variation patterns: Case controlled study.

BACKGROUND: Despite numerous potential benefits of outpatient surgery, there is currently a lack of national benchmarking data available for hospitals and surgeons to compare their own outcomes as they transition toward outpatient surgery. MATERIALS AND METHODS: Patients who underwent 14 common general surgery operations from 2016-2020 were identified in the American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) database. Operations were selected based on frequency and the ability to be performed both in- and outpatient. Postoperative complications and readmissions were compared between patients who underwent inpatient vs outpatient surgery. After adjusting for patient comorbidities, multivariable models assessed the effect of patient characteristics on the odds of experiencing postoperative complications. A separate multiinstitutional study of 21 affiliated hospitals assessed practice variation. RESULTS: In 13 of the 14 studied procedures, complications were lower for patients who were selected for outpatient surgery (all P<0.01); minimally invasive (MIS) adrenalectomy showed no difference (P=0.61). Multivariable analysis confirmed these findings; the odds of experiencing any adverse events were lower following outpatient surgery in all operations but MIS adrenalectomy (OR 0.97; 95% CI 0.47-2.02). Analysis of institutional practices demonstrated variation in the rate of outpatient surgery in certain breast, endocrine, and hernia repair operations. CONCLUSIONS: Institutional practice patterns may explain the national variation in the rate of outpatient surgery. While the present data does not support the adoption of outpatient surgery to less optimal candidates, addressing unexplained practice variations could result in improved utilization of outpatient surgery.

Bariatric Surgery and Longitudinal Cancer Risk: A Review.

Importance: Cancer is one of the leading causes of death in the United States, with the obesity epidemic contributing to its steady increase every year. Recent cohort studies find an association between bariatric surgery and reduced longitudinal cancer risk, but with heterogeneous findings. Observations: This review summarizes how obesity leads to an increased risk of developing cancer and synthesizes current evidence behind the potential for bariatric surgery to reduce longitudinal cancer risk. Overall, bariatric surgery appears to have the strongest and most consistent association with decreased incidence of developing breast, ovarian, and endometrial cancers. The association of bariatric surgery and the development of esophageal, gastric, liver, and pancreas cancer is heterogenous with studies showing either no association or decreased longitudinal incidences. Conversely, there have been preclinical and cohort studies implying an increased risk of developing colon and rectal cancer after bariatric surgery. A review and synthesis of the existing literature reveals epidemiologic shortcomings of cohort studies that potentially explain incongruencies observed between studies. Conclusions and Relevance: Studies examining the association of bariatric surgery and longitudinal cancer risk remain heterogeneous and could be explained by certain epidemiologic considerations. This review provides a framework to better define subgroups of patients at higher risk of developing cancer who would potentially benefit more from bariatric surgery, as well as subgroups where more caution should be exercised.

The influence of operating room temperature and humidity on surgical site infection: A multisite ACS-NSQIP analysis.

BACKGROUND: Literature evaluating intraoperative temperature/humidity and risk of surgical site infection (SSI) is lacking. METHODS: All operations at three centers reported to the ACS-NSQIP were reviewed (2016-2020); ambient intraoperative temperature (°F) and relative humidity (RH) were recorded in 15-min intervals. The primary endpoint was superficial SSI, which was evaluated with multi-level logistic regression. RESULTS: 14,519 operations were analyzed with 179 SSIs (1.2%). The lower/upper 10th percentiles for temperature and RH were 64.4/71.4 °F and 33.5/55.5% respectively. Low or high temperature carried no significant increased risk for SSI (Low °F OR = 0.95, 95% CI 0.51-1.77, P = 0.86; High °F OR = 1.13, 95% CI = 0.69-1.86, P = 0.63). This was also true for low and high RH (Low RH OR = 0.96, 95% CI 0.58-1.61, p = 0.88; High RH OR = 0.61, 95% CI = 0.33-1.14, P = 0.12). Analysis of combined temperature/humidity showed no increased risk for SSI. CONCLUSION: Significant deviations in intraoperative temperature/humidity are not associated with increased risk of SSI.

Surgical Site Infections in Open and Laparoscopic Operations in Rooms With Open-floor Drainage Systems.

INTRODUCTION: Surgical site infections are common postoperative complications. Some operating rooms have open-floor drainage systems for fluid disposal during endourologic cases, although nonendoscopy cases are not always allowed in these rooms. We hypothesized that operating rooms with open-floor drainage systems would not materially affect risk of surgical site infections for patients undergoing open and laparoscopic procedures. METHODS: Patients who had surgical site infections from 2016 through 2020 were identified from data of the National Surgical Quality Improvement Program. Patients without surgical incisions, with open wounds, and with surgical site infections at surgery were excluded. The primary outcome was surgical site infection occurrence within 30 days of surgery. Multilevel multivariable logistic regression was used to estimate the observed-to-expected surgical site infection ratio for each operating room (2 with and 23 without open-floor drainage systems). RESULTS: We identified 8,419 surgical cases, of which 802 (9.5%) were performed in operating rooms with open-floor drainage systems; 166 patients (2.0%) had surgical site infections. Of the surgical site infections, 7 (4.2%) occurred in operating rooms with open-floor drainage systems. Surgical specialty, American Society of Anesthesiologists physical status, higher case acuity, dyspnea, immunosuppression, longer surgical duration, and wound classification were associated with surgical site infections (P < .05 for all). The observed-to-expected ratios of surgical site infections occurring in the 2 operating rooms with open-floor drainage systems were 0.85 and 1.15. The odds ratio of surgical site infections for urologic cases performed in room with vs without open-floor drainage systems was 1.30 (P = .65). CONCLUSIONS: Urology operating room designs often include open-floor drainage systems for water-based cases. These drainage systems were not associated with an increased risk of surgical site infections.

Short and long-term oncologic outcomes of patients with colon cancer of the splenic flexure.

BACKGROUND: There is currently no consensus on surgical management of splenic flexure adenocarcinoma (SFA). METHODS: Patients undergoing surgical resection for SFA between 1993 and 2015 were identified. Postoperative outcomes were compared between patients who underwent segmental (SR) vs. anatomical resection (AR). RESULTS: One-hundred and thirteen patients underwent SR and 89 underwent AR. More patients in the SR group had open resections, but there were otherwise no differences in demographics or surgical characteristics between the two groups. There were no differences in overall (p = 0.29) or recurrence-free(p = 0.37) survival. On multivariable analysis, increased age (HR 1.04, 1.01-1.07, p = 0.005), higher American Society of Anesthesiology classification (HR 3.1, 1.7-5.71, p < 0.001), and higher tumor stage (HR 8.84, 3.76-20.82, p < 0.001) were predictive of mortality. CONCLUSIONS: Short and long-term outcomes after SR and AR for SFA are not different, making SR a viable option for SFA surgical management.

Performance of General Surgical Procedures in Outpatient Settings Before and After Onset of the COVID-19 Pandemic.

Importance: The American College of Surgeons (ACS) has advocated for the expansion of outpatient surgery to conserve limited hospital resources and bed capacity, while maintaining surgical throughput, during the COVID-19 pandemic. Objective: To investigate the association of the COVID-19 pandemic with outpatient scheduled general surgery procedures. Design, Setting, and Participants: This multicenter, retrospective cohort study analyzed data from hospitals participating in the ACS National Surgical Quality Improvement Program (ACS-NSQIP) from January 1, 2016, to December 31, 2019 (before COVID-19), and from January 1 to December 31, 2020 (during COVID-19). Adult patients (≥18 years of age) who underwent any 1 of the 16 most frequently performed scheduled general surgery operations in the ACS-NSQIP database were included. Main Outcomes and Measures: The primary outcome was the percentage of outpatient cases (length of stay, 0 days) for each procedure. To determine the rate of change over time, multiple multivariable logistic regression models were used to assess the independent association of year with the odds of outpatient surgery. Results: A total of 988 436 patients were identified (mean [SD] age, 54.5 [16.1] years; 574 683 women [58.1%]), of whom 823 746 underwent scheduled surgery before COVID-19 and 164 690 had surgery during COVID-19. On multivariable analysis, the odds of outpatient surgery during COVID-19 (vs 2019) were higher in patients who underwent mastectomy for cancer (odds ratio [OR], 2.49 [95% CI, 2.33-2.67]), minimally invasive adrenalectomy (OR, 1.93 [95% CI, 1.34-2.77]), thyroid lobectomy (OR, 1.43 [95% CI, 1.32-1.54]), breast lumpectomy (OR, 1.34 [95% CI, 1.23-1.46]), minimally invasive ventral hernia repair (OR, 1.21 [95% CI, 1.15-1.27]), minimally invasive sleeve gastrectomy (OR, 2.56 [95% CI, 1.89-3.48]), parathyroidectomy (OR, 1.24 [95% CI, 1.14-1.34]), and total thyroidectomy (OR, 1.53 [95% CI, 1.42-1.65]). These odds were all greater than those observed for 2019 vs 2018, 2018 vs 2017, and 2017 vs 2016, suggesting that an accelerated increase in outpatient surgery rates in 2020 occurred as a consequence of COVID-19, rather than a continuation of secular trends. Despite these findings, only 4 procedures had a clinically meaningful (≥10%) overall increase in outpatient surgery rates during the study period: mastectomy for cancer (+19.4%), thyroid lobectomy (+14.7%), minimally invasive ventral hernia repair (+10.6%), and parathyroidectomy (+10.0%). Conclusions and Relevance: In this cohort study, the first year of the COVID-19 pandemic was associated with an accelerated transition to outpatient surgery for many scheduled general surgical operations; however, the magnitude of percentage increase was small for all but 4 procedure types. Further studies should explore potential barriers to the uptake of this approach, particularly for procedures that have been shown to be safe when performed in an outpatient setting.

Understanding Variation in In-hospital Mortality After Major Surgery in the United States.

OBJECTIVES: We aimed to quantify the contributions of patient characteristics (PC), hospital structural characteristics (HC), and hospital operative volumes (HOV) to in-hospital mortality (IHM) after major surgery in the United States (US). BACKGROUND: The volume-outcome relationship correlates higher HOV with decreased IHM. However, IHM after major surgery is multifactorial, and the relative contribution of PC, HC, and HOV to IHM after major surgery is unknown. STUDY DESIGN: Patients undergoing major pancreatic, esophageal, lung, bladder, and rectal operations between 2006 and 2011 were identified from the Nationwide Inpatient Sample linked to the American Hospital Association survey. Multilevel logistic regression models were constructed using PC, HC, and HOV to calculate attributable variability in IHM for each. RESULTS: Eighty thousand nine hundred sixty-nine patients across 1025 hospitals were included. Postoperative IHM ranged from 0.9% for rectal to 3.9% for esophageal surgery. Patient characteristics contributed most of the variability in IHM for esophageal (63%), pancreatic (62.9%), rectal (41.2%), and lung (44.4%) operations. HOV explained < 25% of variability for pancreatic, esophageal, lung, and rectal surgery. HC accounted for 16.9% and 17.4% of the variability in IHM for esophageal and rectal surgery. Unexplained variability in IHM was high in the lung (44.3%), bladder (39.3%), and rectal (33.7%) surgery subgroups. CONCLUSIONS: Despite recent policy focus on the volume-outcome relationship, HOV was not the most important contributor to IHM for the major organ surgeries studied. PC remains the largest identifiable contributor to hospital mortality. Quality improvement initiatives should emphasize patient optimization and structural improvements, in addition to investigating the yet unexplained sources contributing to IHM.

Management of Acute Diverticulitis in Immunocompromised Patients-The Mayo Clinic Experience.

BACKGROUND: Acute diverticulitis in immunocompromised patients is associated with high morbidity and mortality rates with either medical or surgical treatment. Thus, management approach is controversial, especially for patients presenting with nonperforated disease. OBJECTIVE: This study aimed to report the Mayo clinic experience of acute diverticulitis management in immunocompromised patients. DESIGN: This design is based on a retrospective cohort study. SETTING: This study was conducted with institutional data composed from 3 tertiary referral centers. PATIENTS: Immunocompromised patients presenting with acute diverticulitis at 3 Mayo clinic sites between 2016 and 2020 were included. MAIN OUTCOME MEASURES: The main outcome measures were the management algorithm and short-term outcomes. RESULTS: Immunocompromised patients presenting with acute uncomplicated diverticulitis (86) were all managed nonoperatively at presentation with a success rate of 93% (80/86). Two patients (2.3%, 2/86) required surgery during the same admission, and 4 patients (4.8%, 4/84) had 30-day readmission. Complicated diverticulitis patients with abscess (22) were all managed nonoperatively first with a success rate of 95.4% (21/22). One patient (4.6%, 1/22) required surgery during the same admission. All the patients who presented with obstruction (2), fistula (1), or free perforation (11) underwent surgery except one who chose hospice. Overall, the major complication rate was 50% (8/16) and mortality rate was 18.8% (3/16) among patients who underwent surgery during the same admission. For patients who presented with perforated diverticulitis, the mortality rate was 27.3% (3/11), compared with 0% (0/111) for patients who presented with nonperforated disease. LIMITATIONS: This cohort was limited by its retrospective nature and heterogeneity of the patient population. CONCLUSIONS: Nonoperative management was safe and feasible for immunocompromised patients with colonic diverticulitis without perforation at our center. Perforated colonic diverticulitis in immunocompromised patients was associated with high morbidity and mortality rate. See Video Abstract at http://links.lww.com/DCR/B988 .MANEJO DE LA DIVERTICULITIS AGUDA EN PACIENTES INMUNOCOMPROMETIDOS: EXPERIENCIA DE LA CLINICA MAYOANTECEDENTES:La diverticulitis aguda en pacientes inmunocomprometidos se asocia con una alta tasa de morbilidad y mortalidad con el tratamiento médico o quirúrgico. Por lo tanto, el enfoque de manejo es controvertido, especialmente para pacientes que presentan enfermedad no perforada.OBJETIVO:El propósito fue informar la experiencia de la clínica Mayo en el manejo de la diverticulitis aguda en pacientes inmunocomprometidos.DISEÑO:Este es un estudio de cohorte retrospectivoENTORNO CLÍNICO:Este estudio se realizó con datos institucionales compuestos de tres centros de referencia terciarios.PACIENTES:Se incluyeron pacientes inmunocomprometidos que presentaron diverticulitis aguda en tres sitios de la clínica Mayo entre 2016 y 2020.RESULTADO PRINCIPAL:Algoritmo de gestión y resultados a corto plazo.RESULTADOS:Los pacientes inmunocomprometidos que presentaban diverticulitis aguda no complicada (86) fueron tratados de forma no quirúrgica en la presentación inicial con una tasa de éxito del 93 % (80/86). Dos pacientes (2,3%, 2/86) requirieron cirugía durante el mismo ingreso y cuatro pacientes (4,8%, 4/84) tuvieron reingreso a los 30 días. Todos los pacientes con diverticulitis complicada con absceso (22) fueron tratados primero de forma no quirúrgica con una tasa de éxito del 95,4 % (21/22). Un paciente (4,6%, 1/22) requirió cirugía durante el mismo ingreso. Todos los pacientes que presentaron obstrucción (2), fístula (1) o perforación libre (11) fueron intervenidos excepto uno que optó por hospicio. La tasa global de complicaciones mayores fue del 50 % (8/16) y la tasa de mortalidad fue del 18,8 % (3/16) entre los pacientes que se sometieron a cirugía durante el mismo ingreso. Para los pacientes que presentaban diverticulitis perforada, la tasa de mortalidad fue del 27,3 % (3/11), en comparación con el 0 % (0/111) de los pacientes que presentaban enfermedad no perforada.LIMITACIONES:Esta cohorte estuvo limitada por su naturaleza retrospectiva y la heterogeneidad de la población de pacientes. CONCLUSINES: El manejo no quirúrgico fue seguro y factible para pacientes inmunocomprometidos con diverticulitis colónica sin perforación en nuestro centro. La diverticulitis colónica perforada en pacientes inmunocomprometidos se asoció con una alta tasa de morbilidad y mortalidad. Consulte Video Resumen en http://links.lww.com/DCR/B988 . (Traducción- Dr. Ingrid Melo ).

Identifying the Optimal case-volume threshold for pancreatectomy in contemporary practice.

BACKGROUND: The volume-mortality association led to regionalization recommendations for pancreatic surgery. Mortality following pancreatectomy has declined, but case-volume thresholds remain unchanged. METHODS: Patients undergoing pancreatectomy from 2004 to 2013 were identified in the National Cancer Database (NCDB). Hospitals were divided into low (LV), medium (MV), and high-volume (HV) strata using 30-day mortality quartiles and logistic regression with cubic splines. Adjusted absolute difference and odds of 30-day mortality between strata were calculated. RESULTS: Annual volumes for LV, MV, and HV were <4, 4-18 and > 18 cases using quartiles and <6, 6-18 and > 18 using cubic splines. Absolute 30-day mortality trended downwards, with differential improvements for MV and LV. Benchmark 30-day mortality for hospitals with >18 cases was 2.8%. For this benchmark, the case-volume threshold decreased from 31 in 2004 to 6 in 2013. CONCLUSION: Differential improvement in 30-day mortality at LV and MV hospitals led to similar 30-day mortality odds at MV and HV hospitals by 2013.

What Is The Value Of A Star When Choosing A Provider For Total Joint Replacement? A Discrete Choice Experiment.

The past decade witnessed a rapid rise in the public reporting of surgeon- and hospital-specific quality-of-care measures. However, patients' interpretations of star ratings and their importance relative to other considerations (for example, cost, distance traveled) are poorly understood. We conducted a discrete choice experiment in an outpatient setting (an academic joint arthroplasty practice) to study trade-offs that patients are willing to make in choosing a provider for a hypothetical total joint arthroplasty. Two hundred consecutive new patients presenting for hip or knee pain in 2018 were included. The average patient was willing to pay $2,607 and $3,152 extra for an additional hospital or physician star, respectively, and an extra $11.45 to not travel an extra mile for arthroplasty care. History of prior surgery and prior experience with rating systems reduced the relative value of an incremental star by $539.25 and $934.50, respectively. Patients appear willing to accept significantly higher copayments for higher quality of care, and surgeon quality seems relatively more important than hospital quality. Further study is needed to understand the value and trust patients place in publicly reported hospital and surgeon quality ratings.

Challenges of Modeling Outcomes for Surgical Infections: A Word of Caution.

Background: We developed a novel analytic tool for colorectal deep organ/space surgical site infections (C-OSI) prediction utilizing both institutional and extra-institutional American College of Surgeons-National Surgical Quality Improvement Program (ACS-NSQIP) data. Methods: Elective colorectal resections (2006-2014) were included. The primary end point was C-OSI rate. A Bayesian-Probit regression model with multiple imputation (BPMI) via Dirichlet process handled missing data. The baseline model for comparison was a multivariable logistic regression model (generalized linear model; GLM) with indicator parameters for missing data and stepwise variable selection. Out-of-sample performance was evaluated with receiver operating characteristic (ROC) analysis of 10-fold cross-validated samples. Results: Among 2,376 resections, C-OSI rate was 4.6% (n = 108). The BPMI model identified (n = 57; 56% sensitivity) of these patients, when set at a threshold leading to 80% specificity (approximately a 20% false alarm rate). The BPMI model produced an area under the curve (AUC) = 0.78 via 10-fold cross- validation demonstrating high predictive accuracy. In contrast, the traditional GLM approach produced an AUC = 0.71 and a corresponding sensitivity of 0.47 at 80% specificity, both of which were statstically significant differences. In addition, when the model was built utilizing extra-institutional data via inclusion of all (non-Mayo Clinic) patients in ACS-NSQIP, C-OSI prediction was less accurate with AUC = 0.74 and sensitivity of 0.47 (i.e., a 19% relative performance decrease) when applied to patients at our institution. Conclusions: Although the statistical methodology associated with the BPMI model provides advantages over conventional handling of missing data, the tool should be built with data specific to the individual institution to optimize performance.

The July Effect for Total Joint Arthroplasty Procedures.

The "July effect" refers to the assumed increased risk of complications during the months when medical school graduates transition to residency programs. The actual existence of a July effect is controversial. With this study, the authors sought to determine whether evidence exists for the presence of a July effect among total joint arthroplasty (TJA) procedures. The 2013 and 2014 Nationwide Readmission Databases were combined and all index primary and revision arthroplasty procedures were identified, and then patients from December were excluded. Thirty-day readmission rates, time to readmission, and readmission costs were analyzed by index procedure month and index procedure type. A total of 1,193,034 procedures (index primary: n=1,107,657; revision arthroplasty: n=85,377) were identified. Among all procedure types, 46,674 (3.9%) 30-day readmissions were observed. Among all procedures, an index procedure with a discharge in July resulted in the highest monthly readmission rate of the year (4.2%), which was significantly higher than the mean annual readmission rate (P<.0001). This effect was most pronounced for primary total knee arthroplasty (3.9% vs 3.6%, P<.0001). When stratifying results into teaching vs nonteaching hospitals, the highest readmission rate occurred if the index procedure occurred at a nonteaching hospital in July (4.5%, P<.0001). These data provide evidence that a July effect appears to exist for TJA procedures and is most pronounced at nonteaching institutions. Based on published mean readmission costs, the total annualized cost variation attributable to the higher readmission rate for primary TJA procedures in July is approximately $18.6 million. [Orthopedics. 2020;43(6):e543-e548.].

Hip Disarticulation for Periprosthetic Joint Infection: Frequency, Outcome, and Risk Factors.

BACKGROUND: Currently, the largest available series of hip disarticulation (HD) procedures performed for periprosthetic joint infection (PJI) includes only 6 patients. Given the lack of data on this dreadful outcome, we sought to determine the frequency of and risk factors for HD performed for a primary diagnosis of PJI. METHODS: The National Inpatient Sample from 1998 to 2016 was used to estimate the annual incidences of HD associated with PJI, elective primary total joint arthroplasty (control group 1), and other surgical procedures associated with PJI (control group 2) using National Inpatient Sample trend weights. RESULTS: One-hundred forty-eight HDs for PJI, 2,378,313 primary total joint arthroplasty controls, and 51,580 PJI controls were identified. Median length-of-stay (11 days), proportion of patients with ≥5 comorbidities (22.8%), and median hospital costs ($25,895.60) were all greater for patients with HD compared with both control groups. The weighted frequency of HD hospitalizations increased by 366%, whereas the frequency of cases in control groups 1 and 2 increased by 93% and 310%, respectively, during the same timeframe. Upon multivariable logistic regression, age <65 years without private insurance (reference group: age ≥65 years without private insurance, odds ratio [OR]: 1.55; 95% confidence interval [CI]: 1.08-2.24), diabetes with chronic complications (OR: 1.91; 95% CI: 1.12-3.26), and peripheral vascular disease (OR: 2.59; 95% CI: 1.49-4.48) were significantly associated with increased risk of HD among all patients with PJI. CONCLUSION: While the overall frequency of lower extremity amputations may be decreasing, our study documents an alarming increase in the frequency of HD for PJI during the study period. Patients under age 65 years without private insurance were at significantly higher risk of HD among patients with PJI.

Can a Convolutional Neural Network Classify Knee Osteoarthritis on Plain Radiographs as Accurately as Fellowship-Trained Knee Arthroplasty Surgeons?

BACKGROUND: Osteoarthritis (OA) is the leading cause of disability among adults in the United States. As the diagnosis is based on the accurate interpretation of knee radiographs, use of a convolutional neural network (CNN) to grade OA severity has the potential to significantly reduce variability. METHODS: Knee radiographs from consecutive patients presenting to a large academic arthroplasty practice were obtained retrospectively. These images were rated by 4 fellowship-trained knee arthroplasty surgeons using the International Knee Documentation Committee (IKDC) scoring system. The intraclass correlation coefficient (ICC) for surgeons alone and surgeons with a CNN that was trained using 4755 separate images were compared. RESULTS: Two hundred eighty-eight posteroanterior flexion knee radiographs (576 knees) were reviewed; 131 knees were removed due to poor quality or prior TKA. Each remaining knee was rated by 4 blinded surgeons for a total of 1780 human knee ratings. The ICC among the 4 surgeons for all possible IKDC grades was 0.703 (95% confidence interval [CI] 0.667-0.737). The ICC for the 4 surgeons and the trained CNN was 0.685 (95% CI 0.65-0.719). For IKDC D vs any other rating, the ICC of the 4 surgeons was 0.713 (95% CI 0.678-0.746), and the ICC of 4 surgeons and CNN was 0.697 (95% CI 0.663-0.73). CONCLUSIONS: A CNN can identify and classify knee OA as accurately as a fellowship-trained arthroplasty surgeon. This technology has the potential to reduce variability in the diagnosis and treatment of knee OA.

Correlation of Proposed Surgical Volume Standards for Complex Cancer Surgery with Hospital Mortality.

BACKGROUND: Minimum case volume thresholds for complex cancer operations have been proposed by the Leapfrog Group. There has been no formal study of how these standards correlate with actual hospital mortality. STUDY DESIGN: The National Cancer Database was used to identify patients undergoing operations for esophageal, lung, pancreatic, and rectal cancer between 2013 and 2015. Recommended annual hospital case volume was used to divide hospitals into those meeting a minimum volume threshold (VT) and those below it. Hospitals in the highest quartile of adjusted hospital mortality were designated as poor performing hospitals (PPHs). Sensitivity, specificity, negative predictive value, and positive predictive value of current minimum VTs to predict PPHs were calculated. RESULTS: The proportion of hospitals meeting minimum VTs varied from 7% for esophagectomy to 27% for rectal operations. Proposed minimum VTs had a sensitivity of 69% to 93%, specificity of 7% to 27%, and area under the curve of 0.59 to 0.65 for identifying PPHs. Although the negative predictive value varied from 72% to 79%, the positive predictive value was only 24% to 26%. Optimal minimum VTs to identify PPHs were lower than those currently proposed-esophagus was 4 vs 20, lung was 21 vs 40, pancreas was 7 vs 20, and rectum was 8 vs 16. Even under these idealized volume cutoffs, the best performing procedure-specific model (esophagus) had an area under the curve of 0.68. CONCLUSIONS: Although proposed minimum VTs are reasonably good at identifying PPHs, they misclassify 3 of 4 hospitals below the minimum VT as PPHs and 1 of 4 PPHs as meeting the minimum VT. Use of case volume cutoffs alone does not correlate well with actual hospital mortality.

Aversion to Total Joint Arthroplasty: Functional Scores Predict Patient Preferences.

Many patients who may benefit from total hip arthroplasty and total knee arthroplasty prefer to avoid surgery. Reasons for avoidance may include, but are not limited to, experience or dissatisfaction with prior treatment, living status, and symptom severity. Taking these variables into account, the authors sought to determine whether preoperatively collected functional scores would predict an aversion to total joint arthroplasty. A prospective cross-sectional survey was administered to consecutive patients during a 5-month period at the initial consultation for osteoarthritis of the hip or knee. Patient demographics, Hip disability and Osteoarthritis Outcome Score (HOOS), Knee injury and Osteoarthritis Outcome Score (KOOS), Veterans RAND 12-Item Health Survey (VR-12) score, radiographic findings, and preference for or against surgical treatment for osteoarthritis were collected. Logistic regression was performed to determine factors associated with aversion to total joint arthroplasty, and receiver operating characteristic curves were used to determine an appropriate functional score cutoff associated with aversion to surgery. Twenty-two of 103 total patients (21.4%) were averse to surgery. The proportion of patients who underwent surgery was significantly smaller for those averse compared with those not averse to surgery (4.6% vs 23.5%, P<.05). Baseline characteristics, including age, radiographic scores, satisfaction with prior treatment, work status, education, living status, and VR-12 scores were similar between the groups. Functional scores were significantly higher for averse patients (KOOS, 66.6 vs 50.6, P<.001; HOOS, 73.2 vs 62.2, P<.05). Univariate logistic regression revealed a significant association between functional scores and aversion. Optimal cutoff values for all patients overall were 57.1 and 58.9, with an area under the curve of 0.73 and 0.68, for KOOS and HOOS, respectively. Initial aversion was a strong predictor of the ultimate method of treatment chosen. When controlling for other clinically important baseline characteristics, prospectively collected functional scores may be useful in predicting surgical aversion. [Orthopedics. 2020;43(3):147-153.].

Concordance Between Registry and Administrative Data in the Determination of Comorbidity: A Multi-institutional Study.

OBJECTIVE: To characterize agreement between administrative and registry data in the determination of patient-level comorbidities. BACKGROUND: Previous research finds poor agreement between these 2 types of data in the determination of outcomes. We hypothesized that concordance between administrative and registry data would also be poor. METHODS: A cohort of inpatient operations (length of stay 1 day or greater) was obtained from a consortium of 8 hospitals. Within each hospital, National Surgical Quality Improvement Program (NSQIP) data were merged with intra-institutional inpatient administrative data. Twelve different comorbidities (diabetes, hypertension, congestive heart failure, hemodialysis-dependence, cancer diagnosis, chronic obstructive pulmonary disease, ascites, sepsis, smoking, steroid, congestive heart failure, acute renal failure, and dyspnea) were analyzed in terms of agreement between administrative and NSQIP data. RESULTS: Forty-one thousand four hundred thirty-two inpatient surgical hospitalizations were analyzed in this study. Concordance (Cohen Kappa value) between the 2 data sources varied from 0.79 (diabetes) to 0.02 (dyspnea). Hospital variation in concordance (intersite variation) was quantified using a test of homogeneity. This test found significant intersite variation at a level of P < 0.001 for each of the comorbidities except for dialysis (P = 0.07) and acute renal failure (P = 0.19). These findings imply significant differences between hospitals in their generation of comorbidity data. CONCLUSION: This study finds significant differences in how administrative versus registry data assess patient-level comorbidity. These differences are of concern to patients, payers, and providers, each of which had a stake in the integrity of these data. Standardized definitions of comorbidity and periodic audits are necessary to ensure data accuracy and minimize bias.

Postoperative Surgical Site Infections: Understanding the Discordance Between Surveillance Systems.

OBJECTIVE: To characterize agreement in the ascertainment of surgical site infections (SSIs) between the National Surgical Quality Improvement Program (NSQIP), National Healthcare Safety Network (NHSN), and administrative data. BACKGROUND: The NSQIP, NHSN, and administrative data are the primary systems used to monitor and report SSIs for the purpose of quality control and benchmarking of hospitals and surgeons. These systems have different methods for identifying SSIs. METHODS: We queried the NHSN, NSQIP, and administrative data systems for patients who had an operation at 1 of 4 hospitals within a single health system between January 2013 and September 2015. The detection of an SSI during a postoperative hospitalization was the outcome of analysis. Any SSI detected by one (or more) of these systems was analyzed by 2 reviewers to determine the presence of discrete elements of documentation constituting evidence of SSI. Concordance between the 3 systems (NHSN, NSQIP, and administrative data) was analyzed using Cohen's kappa. RESULTS: After application of appropriate exclusion criteria, a cohort of 9447 inpatient operations was analyzed. In total, 130 SSIs were detected by 1 or more of the 3 systems, with reported SSI rates of 0.5% (NHSN), 0.7% (administrative data), and 1.0% (NSQIP). Of these 130 SSIs, only 17 SSIs were reported by all 3 systems. The concordance between these 3 systems was moderate (kappa values NSQIP-NHSN = 0.50 [0.40-0.60], administrative-NHSN = 0.36 [0.24-0.47], and administrative-NSQIP = 0.47 [0.38-0.57]). Chart review found that reasons for discordance were related to issues of different criteria as well as inaccuracies. CONCLUSION: There is significant discordance in the determination of SSIs reported by the NHSN, NSQIP, and administrative data. The differences and limitations of each of these systems have to be recognized, especially when using these data for quality reports and pay for performance.

The Clinical and Financial Consequences of the Centers for Medicare and Medicaid Services' Two-Midnight Rule in Total Joint Arthroplasty.

BACKGROUND: To lessen the financial burden of total joint arthroplasty (TJA) and encourage shorter hospital stays, the Centers for Medicare and Medicaid Services (CMS) recently removed TKA from the inpatient-only list. This policy change now requires providers and institutions to apply the two-midnight rule (TMR) to short-stay (1-midnight) inpatient hospitalizations (SSIH). METHODS: The National Inpatient Sample from 2012 through 2016 was used to analyze trends in length of stay following elective TJA. Using publically-available policy documentation, published median Medicare payments, and National Inpatient Sample hospital costs, we analyzed the application of the TMR to SSIHs and compared the results to the previous policy environment. Specifically, we modeled 3 scenarios for all 2016 Medicare SSIHs: (1) all patients kept an extra midnight to satisfy the TMR, (2) all patients discharged as an outpatient, and (3) all patients discharged as an inpatient. RESULTS: The overall percentage of Medicare SSIHs increased significantly from 2.7% in 2012 to 17.8% in 2016 (P < .0001). Scenario 1 resulted in no change in out-of-pocket (OOP) costs to patients, no change in CMS payments, and hospital losses of $117.0 million. Scenario 2 resulted in no change in patient OOP costs, reduction in payments from CMS of $181.8 million, and hospital losses of $357.3 million. Scenario 3 resulted in no change in patient OOP costs, no change in CMS payments, and an estimated $1.71 billion of SSIH charges at risk to hospitals for audit. CONCLUSION: The results of this analysis reveal the conflict between length of stay trends following TJA and the imposition of the TMR.