3% (95% CI, 96.5-98.1), and 10-year implant survival of 97.0% (95% CI, 96.0-98.0). When infection was excluded, implant survivorship improved to 99.2% (95% CI, 98.8-99.6) at 2 years, 98.9% (95% CI, 98.5-99.4) at 5 years, and 98.7% (95% CI, 98.1-99.4) at 10 years. CONCLUSION This THA implant system comprising an uncemented press-fit acetabulum used alongside a dual-tapered femoral stem is an excellent option for THA. Implant survivorship at 2, 5, and 10 years is among the best reported for any total hip system in the world. BACKGROUND Centers for Medicare and Medicaid Services removed total knee arthroplasties (TKAs) from the Inpatient-Only list on January 1, 2018, which meant TKAs could be performed on a hospital outpatient basis. We sought to understand (1) what the financial implications have been for hospitals, (2) to what extent financial incentives have influenced the adoption of outpatient TKAs across hospitals, (3) whether adoption of outpatient TKAs has impacted the success of hospitals with managing post-acute care (PAC) spend, and (4) the financial implications to Medicare of the adoption of outpatient TKAs. METHODS We used national patient-level Medicare fee-for-service Part A claims data (100% sample) from January 2018 through June 2019 to calculate the inpatient and outpatient TKA payment rate for each hospital, and the distribution in these payments across the country. ZX703 We then ran case-level regressions to understand the factors associated with adoption of outpatient TKAs, and the drivers of PAC spend. Finally, we quantified the savings to Medicare. RESULTS Hospitals on average received $3682 (30%) lower payment from Medicare for outpatient TKA cases, but this varied widely across hospitals. The difference in payment rates across hospitals was not statistically significantly related to their adoption rate of outpatient TKAs. PAC spend was higher for same-day discharges, but lower for cases that stayed at least 1 night. Based on the adoption rate of outpatient TKAs in Q2 2019, Medicare saved $355M on a run rate basis. CONCLUSION Hospitals have adopted outpatient TKAs independent of the financial impact. Medicare has benefited from lower PAC spend and lower payments to hospitals. BACKGROUND The Centers for Medicare and Medicaid Services removed total knee arthroplasties (TKAs) from the inpatient-only (IPO) list on January 1, 2018, which meant that TKAs could be performed on a hospital outpatient basis. We examined the following (1) the national rate of adoption of outpatient TKAs over time, (2) how adoption varied across hospitals, and (3) whether adoption of outpatient TKAs has positively or negatively impacted 90-day TKA readmission rates. METHODS We used national patient-level Medicare Fee-for-Service Part A claims data (100% sample) from January 2017 through June 2019 to look at the quarterly trend in percent of TKAs performed as outpatient, and the distribution in this percentage across hospitals in the country. We ran a case-level regression to understand whether inpatient vs outpatient coding status relates to 90-day readmission rates. RESULTS In 2017 prior to the removal of TKAs from the IPO list, 0.2% were performed as outpatient. In the first quarter (Q1 2018) after the rule change, 24.9% were performed as outpatient, and by the second quarter of 2019, 36.4% were performed as outpatient. These rates varied widely across hospitals from 0% (10th and 25th percentiles) to 78% (90th percentile) from January 2018 through March 2019. There was no difference in readmission rates for same-day discharges, but outpatient cases discharged after one or more nights in the hospital had statistically lower readmissions than inpatient cases. CONCLUSION There was a rapid increase in the adoption of hospital outpatient TKAs following their removal from the Medicare IPO, which has resulted in lower readmission rates, and so adoption is likely to continue. BACKGROUND The purpose of this study is to investigate outcomes of patients denied total hip (THA) or knee arthroplasty (TKA) due to morbid obesity. METHODS We performed an observational study of patients denied arthroplasty due to morbid obesity. A survey including the Harris Hip Score or pain and function components of the original Knee Society Score (KSS) was conducted with minimum 2-year follow-up. Statistical analysis was performed with parametric testing with significance at P less then .05. RESULTS In total, 125 (4.4%) of 2819 patients were denied THA or TKA due to morbid obesity. Twenty-four (19.2%) met target weight and underwent arthroplasty at our institution. Of the remaining 101 (80.8%) patients, 33 (32.7%) agreed to participate in the survey. None received THA and 6 received TKA elsewhere above target body mass index. Harris Hip Score was significantly higher in the successful weight loss cohort at our institution (70.5 ± 13.4 vs 34.6 ± 13.1). KSS Pain (maximum score of 50) and Function (maximum score of 100) were significantly higher in the successful weight loss cohort at our institution (32.9 ± 16.5; 51.1 ± 19.5) compared to the denied nonoperative cohort (7.2 ± 11.5; 33.0 ± 23.1); however, only KSS Pain was higher when compared to the TKA elsewhere cohort (14.2 ± 18.0; 29.2 ± 38.7). KSS Pain and Function were similar for both denial cohorts regardless of undergoing arthroplasty. CONCLUSION Nearly 80% of patients denied never met target weight for arthroplasty. Those who met target weight prior to arthroplasty often reported better outcomes. Outcomes were similar when target weight was not met regardless of undergoing arthroplasty. End-of-life tyre (ELT)-derived rubber granules are used as synthetic turf infill on sports fields. They contain various chemical substances and there are concerns that exposure to these substances might be harmful for human health. This Europe-wide risk assessment study addresses these concerns. As the first part, chemical substances in samples from recycling companies and from sports fields were analysed. 86 coated and non-coated ELT granule samples from sites in 14 European countries were investigated, together with ten non-ELT materials. An extensive list of potentially relevant substances was compiled, and the infill materials were analysed for these substances, using GC and HPLC methods. Volatilisation of substances was studied in emission chambers. Polycyclic aromatic hydrocarbons (sum of 8 REACH PAHs) were identified at average concentrations below 10 mg/kg. Substances found at higher concentrations in rubber granules were aluminium (arithmetic mean in uncoated samples from sports fields 5383 mg/kg) and cobalt (168 mg/kg), benzothiazole (48 mg/kg) and 2-hydroxybenzothiazole (34 mg/kg), 6PPD (571 mg/kg) and DPG (51 mg/kg), and 4-tert-octylphenol (14 mg/kg).