Joint Arthroplasty Patients Research Articles

Cost-effectiveness and clinical utility of universal pre-admission MRSA screening in total joint arthroplasty patients

For patients undergoing total joint arthroplasty (TJA), pre-admission meticillin-resistant Staphylococcus aureus (MRSA) nasal screening has been widely adopted to prevent postoperative joint infection. However, screening cost-effectiveness and clinical utility have not been adequately evaluated. To assess the MRSA infection rate, associated costs, and costs of screening at our institution, before and after screening implementation. This was a retrospective cohort study examining patients who underwent TJA at a health system in New York State, between 2005 and 2016. Patients were divided into the 'no-screening' group if the operation occurred prior to adoption of the MRSA screening protocol in 2011 and the 'screening' group if afterwards. The number of MRSA joint infections, cost of each infection, and costs associated with preoperative screening were recorded. Fisher's exact test and cost comparison analysis were performed. The no-screening group had four MRSA infections in 6088 patients over a seven-year period, whereas the screening group had two in 5177 patients over five years. Fisher's exact test showed no significant association between screening and MRSA infection rate (P= 0.694). The cost of postoperative MRSA joint infection treatment was US$40,919.13 per patient, whereas annual nasal screening was US$103,999.97. At our institution, MRSA screening had little impact on infection rates and led to increased costs, with 2.5 MRSA infections required annually to meet the costs of screening. Therefore, the screening protocol may be best suited for high-risk populations, rather than the average TJA patient. The authors recommend a similar clinical utility and cost-effectiveness analysis at other institutions implementing MRSA screening programmes.

Which Combination is the Best? A Comparison of the Predictive Potential of Serum Biomarker Combinations to Diagnose Periprosthetic Joint Infection

BackgroundWithout a gold-standard test, recent periprosthetic joint infections (PJI) literature has explored the utility of combining serological results, with promising findings. However, previous studies evaluated fewer than 200 patients and often studied only 1 to 2 test combinations. The purpose of this study was to accumulate a large single-institution cohort of revision total joint arthroplasty (rTJA) patients to determine the diagnostic utility of combination serum biomarkers to identify PJI. MethodsA single institution longitudinal database was assessed to identify all patients who underwent rTJA from 2017 to 2020. There were 1,363 rTJA patients (715 rTKA patients and 648 rTHA patients) including 273 PJI cases (20%) analyzed. The PJI was diagnosed post-rTJA utilizing 2011 Musculoskeletal Infection Society (MSIS) criteria. Erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), D-dimer, and interleukin 6 (IL-6) were systematically collected for all patients. ResultsThe rTKA combination markers of CRP + ESR (sensitivity: 78.3%, specificity: 88.8%, positive predictive value (PPV): 70.0%, negative predictive value (NPV): 92.5%), CRP + D-dimer (sensitivity: 60.5%, specificity: 92.6%, PPV: 63.4%, NPV: 91.7%), and CRP + IL-6 (sensitivity: 38.5%, specificity: 100.0%, PPV: 100.0%, NPV: 92.9%) all yielded higher specificity than CRP alone (sensitivity: 94.4%, specificity: 75.0%, PPV: 55.5%, NPV: 97.6%). Similarly, the rTHA combination markers of CRP + ESR (sensitivity: 70.1%, specificity: 88.8%, PPV: 58.1%, NPV: 93.1%), CRP + D-dimer (sensitivity: 57.1%, specificity: 90.1%, PPV: 43.2%, NPV: 94.1%), and CRP + IL-6 (sensitivity: 21.4%, specificity: 98.4%, PPV: 60.0%, NPV: 91.7%) all yielded higher specificity than CRP alone (sensitivity: 84.7%, specificity: 77.5%, PPV: 45.4%, NPV: 95.8%). ConclusionOverall, in diagnosing PJI for both rTKA and rTHA, 2-marker combinations yielded higher specificity, while 3-marker combinations yielded higher sensitivity compared to CRP alone. However, compared to all 2-marker and 3-marker combinations, CRP demonstrated superior overall diagnostic utility. These findings suggest that routine combination testing of markers for PJI diagnosis may be excessive and an unnecessary use of resources, especially in resource-limited situations.

Cefazolin vs Second-line Antibiotics for Surgical Site Infection Prevention After Total Joint Arthroplasty Among Patients With a Beta-lactam Allergy.

Cefazolin is a first-line agent for prevention of surgical site infections (SSIs) after total joint arthroplasty. Patients labeled allergic to beta-lactam antibiotics frequently receive clindamycin or vancomycin perioperatively due to the perceived risk of a hypersensitivity reaction after exposure to cefazolin. This single-system retrospective review included patients labeled allergic to penicillin or cephalosporin antibiotics who underwent a primary total hip and/or knee arthroplasty between January 2020 and July 2021. A detailed chart review was performed to compare the frequency of SSI within 90 days of surgery and interoperative hypersensitivity reactions (HSRs) between patients receiving cefazolin and patients receiving clindamycin and/or vancomycin. A total of 1128 hip and/or knee arthroplasties from 1047 patients were included in the analysis (cefazolin n = 809, clindamycin/vancomycin n = 319). More patients in the clindamycin and/or vancomycin group had a history of cephalosporin allergy and allergic reactions with immediate symptoms. There were fewer SSIs in the cefazolin group compared with the clindamycin and/or vancomycin group (0.9% vs 3.8%; P < .001) including fewer prosthetic joint infections (0.1% vs 1.9%). The frequency of interoperative HSRs was not different between groups (cefazolin = 0.2% vs clindamycin/vancomycin = 1.3%; P = .06). The use of cefazolin as a perioperative antibiotic for infection prophylaxis in total joint arthroplasty in patients labeled beta-lactam allergic is associated with decreased postoperative SSI without an increase in interoperative HSR.

Supplemental oxygen is associated with increased complications and readmission following total shoulder arthroplasty

BackgroundChronic lung disease has a significant burden on surgical patients and in some instances can be so advanced that patients are dependent on home supplemental oxygen. Prior literature has shown that lower extremity total joint arthroplasty patients who are oxygen-dependent exhibit significantly increased rates of postoperative complications and readmission. However, there is a paucity of literature evaluating outcomes following total shoulder arthroplasty (TSA) in oxygen-dependent patients. The purpose of this study is to compare the rates of complications, readmission, revision, and mortality within 180 days of primary elective TSA in oxygen-dependent vs. oxygen-independent patients with comorbid chronic pulmonary disease. MethodsThe Nationwide Readmissions Database was queried from 2015 to 2019 to identify all patients that underwent primary elective TSA with comorbid chronic lung disease (n = 19,469). Patients were stratified into oxygen-dependent (n = 622) and oxygen-independent (n = 18,847) groups. Relevant demographic characteristics and postoperative complications were compared between the oxygen-dependent and oxygen-independent groups. One hundred eighty-day postoperative complication, readmission, revision, and mortality rates were also compared between the two groups. ResultsOxygen dependent patients were significantly more likely to have preoperative hypertension (81% vs. 74%; P < .001), congestive heart failure (20% vs. 7.2%; P < .001), chronic kidney disease (13% vs. 10%; P = .009), and increased Charlson-Deyo comorbidity index (2.4 vs. 2.0; P < .001). Oxygen-dependent patients exhibited higher rates of wound dehiscence (0.2% vs. 0.0%; P = .003), cardiovascular complications (0.6% vs. 0.2%; P = .014), acute renal failure (5.5% vs. 1.9%; P < .001), urinary tract infection (1.9% vs. 1.0%; P = .019), pneumonia (1.6% vs. 0.6%; P = .001), and acute respiratory distress syndrome (6.9% vs. 1.5%; P < .001). Oxygen-dependent patients exhibited higher rates of complications (16% vs. 7.1%; P < .001) and readmission (20% vs. 12%; P < .001) within 180 days of surgery, but no significant differences were observed in 180-day revision or mortality rates between groups. ConclusionOxygen-dependent TSA patients have higher 180-day complication and readmission rates while having similar revision and mortality rates as oxygen-independent patients. These findings should be considered by orthopedic surgeons when considering strategies for perioperative management of oxygen-dependent patients following TSA.

Few Runners Return to Running after Total Joint Arthroplasty, While Others Initiate Running

Introduction: This study examines self-reported running practices in total joint arthroplasty (TJA) patients. Methods: This prospective, cross-sectional study of a multi-institutional database identified 4,462 primary total hip arthroplasty (THA) and total or partial knee arthroplasty (TKA/UKA) patients from June 2015 to June 2020. TJA patients completed an online survey capturing pre-TJA running experience and expectations, surgeon recommendations about return to running, postoperative characteristics, revision surgeries, and the Commitment to Exercise Scale and Brief Resilience Scale. Patient-reported follow-up reached 5 years. Logistic regression, the chi square test, and analysis of variance tests were used. Results: Five hundred forty-nine patients (12.2%) self-reported running preoperatively, and 65 patients (11.8%) returned to running after surgery. 67.2% were satisfied with their return to running. 40 patients (1.0%) who were not preoperative runners started running after TJA. Preoperative runners who returned to running had higher mean Brief Resilience Scale (3.9 ± 0.7) scores and the highest Commitment to Exercise Scale scores (46.5 ± 17.6, F[2,510] = 3.88, P = 0.02). Runners who returned to running had a 6.2% revision rate while those who did not run postoperatively had a 4.8% revision rate (P = 0.55). Surgeon recommendations included no return to running (29.5%), maintain low-impact activities (35.2%), return to preoperative levels (5.1%), and no recommendations (30.1%). Discussion: 12% of TJA preoperative runners returned to running, mostly within 1 year, and 67.2% were satisfied with their running ability.

Total Joint Arthroplasty Patient Demographics Before and after COVID-19 Elective Surgery Restrictions.

In 2020, the COVID-19 pandemic caused cessation of non-emergent total joint arthroplasty (TJA, referring to total hip and total knee arthroplasty) operations between mid-March and April 2020. The purpose of this study is to analyze effects and potential disparities in access to care due to the COVID-19 restrictions. A database was used to examine demographics of patients undergoing TJA from May-December 2019 (Pre-COVID-19) and May-December 2020 (Post-COVID-19 restrictions). Categorical covariates were summarized by reporting counts and percentages and compared using Fisher exact tests. Continuous covariates were summarized by reporting means and standard deviations. Two-sample t-tests were used for continuous covariates. Equality of TJA counts by year were tested using a test of proportions. There were more TJA procedures performed during the post-COVID-19 period in 2020 vs pre-COVID19 (1151 vs. 882, p<.001). There was an increase in the relative percentage of THAs vs. TKAs performed in 2020 vs 2019 (26.9% vs 18.8%, p<.001), and an increase in patients with Medicaid with a decrease in private insurance (p=.043). The average length of stay was shorter in 2020 with a greater percentage of TJAs performed outpatient ( p<.001). There were no differences in patient sex, race, BMI, smoking status, or age between the two periods. A relative increase in THA procedures, an increase in patients with Medicaid and decrease in private insurance, and a decreased length of stay were seen post COVID-19 restrictions. These trends may reflect pandemic-related changes in insurance status as well as the growing shift to same-day discharge.

Prevalence of different types of wound infection in subjects with Parkinson's disease and total joint arthroplasty: A meta-Analysis.

A meta-analysis study to assess the influence of Parkinson's disease (PD) on different types of wound infection (WI) in total joint arthroplasty (TJA) patients. A comprehensive literature examination till January 2023 was implemented and 1976 linked studies were appraised. The picked studies contained 76 661 subjects with TJA in the picked studies' baseline, 19 188 of them were PD, and 57 473 were non-PD. Odds ratio (OR) in addition to 95% confidence intervals (CIs) were used to calculate the consequence of PD on different types of WI in TJA patients by the dichotomous and continuous styles and a fixed or random model. PD had a significantly higher postoperative surgical site WI (OR, 1.76; 95% CI, 1.15-2.67, P= .009), superficial WI (OR, 3.36; 95% CI, 1.41-7.99, P= .006), and periprosthetic WI (OR, 4.89; 95% CI, 2.13-11.22, P< .001) compared to the non-PD in TJA patients' post-surgery wounds. PD had a significantly higher postoperative surgical site WI, superficial WI, and periprosthetic WI compared to the non-PD in TJA patients' post-surgery wounds. Though precautions should be taken when commerce with the consequences since some of the picked studies for this meta-analysis was with low sample sizes.

Periprosthetic infection risks and predictive value of HbA1c/albumin ratio for total joint arthroplasty in patients with diabetes mellitus.

There are no gold standard markers to estimate the risk of developing periprosthetic infections in diabetes mellitus. Our aim is to compare the risks of periprosthetic infection in patients undergoing total joint arthroplasty with diabetes mellitus and to investigate the predictive significance of the HbA1c/ albumin ratio. Between January 2012 and January 2020, 690 patients who underwent total joint arthroplasty were analysed. 264 diabetic patients were included in the study. 104 of them had periprosthetic infection. 8 risk factors (Hba1c/albumin, HbA1c, albumin, age, BMI, ASA, hospital stay, operation time) were analysed. The rate of HbA1c/albumin was 14.6 times higher than the patients with ≤2.37 cut-off value. (Hba1c/albumin ratio (odds ratio (OR) = 14.6, 95% CI: 3.18-67.1, p: 0.01). HbA1c (OR = 2.6, 95% CI: 1.529-4.754, p: 0.001), BMI (OR = 1.6, 95% CI: 1.168-2.199, p<0.003), DM (OR = 0.365, 95% CI: 0.135-0.987, p: 0.04) and glucose (OR = 1.016, 95% CI: 1.004-1.029, p: 0.011) were risk factures for periprosthetic infection. Albumin (OR = 0.503, 95% CI: 0.109-2.314, p: 0.378) did not pose a significant risk for periprosthetic infection. According to our findings, the HbA1c/albumin ratio has a more prognostic capacity than other risks in determining the risk of periprosthetic infection for total joint arthroplasty. HbA1c/albumin ratio is a cheap and easy-to-apply marker. Patients with an HbA1c/albumin cut-off ratio above 2.37 mg/dl in total joint arthroplasty should be followed more closely for the risk of periprosthetic infection.

Visceral Fat as a Risk Factor for Periprosthetic Joint Infection After Total Hip and Knee Arthroplasty

BackgroundVisceral obesity, a strong indicator of chronic inflammation and impaired metabolic health, has been shown to be associated with poor postoperative outcomes and complications. This study aimed to evaluate the relationship between visceral fat area (VFA) and periprosthetic joint infection (PJI) in total joint arthroplasty (TJA) patients. MethodsA retrospective study of 484 patients who had undergone a total hip or knee arthroplasty was performed. All patients had a computed tomography scan of the abdomen/pelvis within two years of their TJA. Body composition data (ie, VFA, subcutaneous fat area, and skeletal muscle area) were calculated at the Lumbar-3 vertebral level via two fully automated and externally validated machine learning algorithms. A multivariable logistic model was created to determine the relationship between VFA and PJI, while accounting for other PJI risk factors. Of the 484 patients, 31 (6.4%) had a PJI complication. ResultsThe rate of PJI among patients with VFA in the top quartile (> 264.1 cm2) versus bottom quartile (< 82.6 cm2) was 5.6% versus 10.6% and 18.8% versus 2.7% in the total hip arthroplasty and total knee arthroplasty cohorts, respectively. In the multivariate model, total knee arthroplasty patients with a VFA in the top quartile had a 30.5 times greater risk of PJI than those in the bottom quartile of VFA (P = .0154). ConclusionVFA may have a strong association with PJI in TJA patients. Using a standardized imaging modality like computed tomography scans to calculate VFA can be a valuable tool for surgeons when assessing risk of PJI.

The Current Relationship Between Surgeon Reimbursement and Patient Complexity in Arthroplasty—A Risk-Payment Analysis of All Primary Joint Replacements Billed to Medicare in 2019

BackgroundThe purpose of this study was to assess surgeon reimbursement among total joint arthroplasty (TJA) patients who had differing risk profiles within the Medicare population. MethodsThe “2019 Medicare Physician and Other Provider” file was utilized. In 2019, 441,584 primary total hip and knee arthroplasty procedures were billed to Medicare Part B. All episodes were included. Patient demographics and comorbidity profiles were collected for all patients. Additionally, mean patient hierarchal condition category (HCC) risk scores and physician reimbursements were collected. All procedure episodes were split into 2 cohorts; those with an HCC risk score of 1.5 or greater, and those with patient HCC risk scores less than 1.5. Variables were averaged for each cohort and compared. ResultsThe mean reimbursement across all procedures was $1,068.03. For the sicker patient cohort with a mean HCC risk score of 1.5 or greater, there was a significantly higher rate of all comorbidities compared to the cohort with HCC risk score under 1.5. The mean payment across the sicker cohort was $1,059.21, while the mean payment among the cohort with HCC risk score under 1.5 was 1,073.32 (P = .032). ConclusionThis study demonstrates that for Medicare patients undergoing primary TJA in 2019, the mean surgeon reimbursement was lower for primary TJA among sick patients in comparison to their healthier counterparts, although it is difficult to ascertain the impact of this discrepancy. As alternative payment models continue to undergo evaluation and development, these data will be important for the potential advancement of more equitable reimbursement models in arthroplasty care, specifically regarding surgeon reimbursement and possible risk adjustment within such models.

What Is the Fate of Total Joint Arthroplasty Patients Who Are Asked to Quit Smoking Prior to Surgery?

BackgroundSmoking is a known risk factor for complications following primary total joint arthroplasty (TJA). Little is known regarding the fate of patients who are asked to quit smoking before surgery. The purpose of this study was to evaluate the success of smoking cessation prior to primary TJA and the impact of smoking cessation on perioperative outcomes. MethodsThis is a retrospective review of patients who presented between 2008 and 2020 to a single academic medical center with a documented smoking history and were asked to quit smoking prior to receiving a date for primary TJA. The cohort was surveyed about smoking cessation, smoking history, use of quit aids, seeking surgery elsewhere due to the cessation policy, and postoperative complications. Descriptive statistics evaluated the relationship between demographics, smoking cessation, and postoperative complications. ResultsA total of 101 patients completed the survey with an overall response rate of 48%. Sixty-two percent of patients quit smoking before surgery, and 51% of these patients reported remaining smoke-free at 6 months postoperatively. The average time to quit before TJA was 45 days (range: 1-365 days), and 62% quit without quit aids. The wound complication/infection rate was significantly higher for patients who did not stop smoking prior to TJA (4 of 16; 27%) than for those who did quit prior to surgery (3 of 63; 5%; P = .02). ConclusionsThis study demonstrates that most patients (62%) will stop smoking, if required, prior to primary TJA. Furthermore, 51% of patients reported abstinence from smoking at 6 months following TJA. TJA appears to be an effective motivator for smoking cessation. Level of EvidenceIII (retrospective cohort study).

Vaping Trends and Outcomes in Primary Total Joint Arthroplasty Patients: An Analysis of 21,341 Patients

The effect of vaping on outcomes after total joint arthroplasty (TJA) and its prevalence in this patient population remain unclear. The purpose of this study was twofold: (1) to investigate the trends of vaping in TJA patients compared with patients who underwent routine physical examination and (2) to examine the influence vaping has on outcomes after TJA. Patients were classified as never vaped, former vape users, or whether they reported current vaping (CV). TJA patients were further classified based on whether they had no exposure to tobacco or vaping (NTNV), tobacco only (TO), both tobacco and vaping (BTV), or vaping only (VO). The TJA group exhibited a steady trend of patients with CV status (P = 0.540) while patients in the routine physical examination cohort demonstrated a significant upward trend in CV status (P = 0.015). Subanalysis of TJA patients revealed that those in the VO category had significantly higher mean surgical time (P < 0.001), length of stay (P = 0.01), and rates of readmission (P = 0.001) compared with all other subgroups. We found steady or increasing trends of electronic cigarette exposure in both groups over time. Additional efforts should be made to document electronic cigarette exposure for all patients.

Letter to the editor regarding the article by Elhage et al.: "Closed-incision negative pressure therapy at -125 mmHg significantly reduces surgical site complications following total hip and knee arthroplasties: A stratified meta-analysis of randomized controlled trials".

Letter to the editor regarding the article by Elhage et al.: "Closed-incision negative pressure therapy at -125 mmHg significantly reduces surgical site complications following total hip and knee arthroplasties: A stratified meta-analysis of randomized controlled trials".

Infection Risk Increases After Total Hip Arthroplasty Within 3 Months Following Intra-Articular Corticosteroid Injection. A Meta-Analysis on Knee and Hip Arthroplasty

BackgroundMuch debate continues regarding the risk of postoperative infection after intra-articular corticosteroid injection prior to total joint arthroplasty. The aim of this study was to evaluate the risk of periprosthetic joint infection (PJI) or other complications after joint arthroplasty in patients who received preoperative corticosteroids injections. MethodsA literature search was performed on PubMed, Web of Science, and Cochrane Library through January 4, 2022. Of 4,596 studies, 28 studies on 480,532 patients were selected for qualitative analysis. Studies describing patients receiving corticosteroids injections before joint arthroplasty (hip, knee) were included in the systematic review. A meta-analysis was performed of studies focusing on corticosteroids injections and PJI. Assessment of risk of bias and quality of evidence was based on the “Downs and Black’s Checklist for Measuring Quality”. ResultsA significant association (odds ratio: 1.55, P = .001, 95% confidence interval: 1.357-1.772) between PJI and corticosteroids injections was found for total hip arthroplasty (THA). No association was found for knee arthroplasty procedures. The risk of PJI is statistically higher (odds ratio: 1.20, P = .045, 95% confidence interval: 1.058-1.347) if the injections are performed within 3 months preoperatively in THA patients. ConclusionPatients undergoing THA who previously received intra-articular injections of corticosteroids may expect a statistically higher risk of developing PJI. On the contrary, no association between corticosteroids injections and PJI could be seen in total knee arthroplasty patients. In addition, injection timing plays an important role: surgeons should refrain from administering corticosteroids injections within 3 months before hip arthroplasty, as it appears to be less safe than waiting a 3-month interval.

The Same Day Discharges following Primary Total Knee Arthroplasty: A Single Surgeon, Propensity Score-Matched Cohort Analysis.

This is a retrospective study. As new surgical techniques and improved perioperative care approaches have become available, the same-day discharge in selected total knee arthroplasty (TKA) patients was introduced to decrease health care costs without compromising outcomes. This study aimed to compare clinical and functional outcomes between same-day discharge TKA patients and inpatient-discharge TKA patients. A retrospective review of 100 consecutive patients with same-day discharge matched to a cohort of 300 patients with inpatient discharge that underwent TKA by a single surgeon at a tertiary referral center was conducted. Propensity-score matching was performed to adjust for baseline differences in preoperative patient demographics, medical comorbidities, and patient-reported outcome measures (PROMs) between both cohorts. All patients had a minimum of 1-year follow-up (range: 1.2-2.8 years). In terms of clinical outcomes for the propensity score-matched cohorts, there was no significant difference in terms of revision rates (1.0 vs. 1.3%, p = 0.76), 90-day emergency department visits (3.0 vs. 3.3%, p = 0.35), 30-day readmission rates (1.0 vs. 1.3%, p = 0.45), and 90-day readmission rates (3.0 vs. 3.6%, p = 0.69). Patients with same-day discharge demonstrated significantly higher postoperative PROM scores, at both 3-month and 1-year follow-up, for PROMIS-10 Physical Score (50 vs. 46, p = 0.028), PROMIS-10 Mental Score (56 vs. 53, p = 0.039), and Physical SF10A (57 vs. 52, p = 0.013). This study showed that patients with same-day discharge had similar clinical outcomes and superior functional outcomes, when compared with patients that had a standard inpatient protocol. This suggests that same-day discharge following TKA may be a safe, viable option in selected total knee joint arthroplasty patients.

Does addition of gentamicin for antibiotic prophylaxis in total knee arthroplasty reduce the rate of periprosthetic joint infection?

First-generation cephalosporins are used as antibiotic prophylaxis in total joint arthroplasty patients. However, this regimen does not address Gram-negative bacteria causing periprosthetic joint infection (PJI). Previous studies have suggested that the addition of an aminoglycoside as antibiotic prophylaxis in THA reduces surgical site infection (SSI), and less is known on its effect in TKA. This study aimed to investigate if the addition of a single-dose gentamicin, administered pre-operatively, is associated with lower rates of infection in TKA patients. This is a retrospective study of patients who underwent primary TKA as treatment for osteoarthritis between January 2011 and April 2021, with a minimum 1-year follow-up. The mean age was 69.9 (± 9.8), the mean BMI was 29.7 (± 5.5), and most patients had American Society of Anaesthesiology (ASA) score of 2-3 (92.9%). Patients were stratified based on the peri-operative antibiotic prophylaxis they received: cefazolin with addition of gentamicin (case group) or cefazolin (control group). Our primary study endpoints were rates of PJI and SSI, which were compared between groups using the chi-square test. Statistical significance was set as p < 0.05. The final study population consisted of 1590 patients, 1008 (63.4%) in the control group and 582 (36.6%) patients in the case group. The total infection rate for patients that received gentamicin dropped by 34%; however, this finding did not reach statistical significance (1.3% (control) vs. 0.86% (case), p = 0.43). The same drop was seen after subdivision of infections to PJI (0.5% vs. 0.34%, 32% drop, p = 0.66) and SSI (0.8% vs. 0.52%, 35% drop, p = 0.52). A single dose of gentamicin administered pre-operatively to a standard antibiotic prophylaxis was not associated with a statistically significant lower rate of PJI. Although the difference in infection rate did not reach statistical significance, the current study noted a drop in the rate of infection by 1/3 in the gentamicin cohort. Further investigation to evaluate the potential benefit of adding gentamicin to a peri-operative antibiotic regimen is warranted.

Unintended Consequences? Medicare Commercial Partnerships Complicate Arthroplasty Care and Registry-Based Research: Commentary on an article by Jennifer C. Wang, BS, et al.: "The Rise of Medicare Advantage. Effects on Total Joint Arthroplasty Patient Care and Research".

Commentary The health-care environment has undergone major changes over the past 20 years, including the expansion of partnerships between commercial insurance carriers and the U.S. Department of Health and Human Services (HHS) through its subagency, the Centers for Medicare & Medicaid Services (CMS). Most orthopaedic surgeons performing arthroplasty procedures have probably observed the growing proportion of their patients with Medicare Advantage (commercially managed Medicare) plans. Few among us were likely aware of the full implication of this transition on clinical practice, patient outcomes, and the effectiveness of registry-based arthroplasty research. Wang and colleagues provide a thoughtful analysis of patient demographic characteristics, medical comorbidities, and 90-day postoperative adverse outcomes that were identified for 697,317 patients who underwent elective total hip or total knee arthroplasty in hospitals participating in the Premier Healthcare Database. The authors identified a 335% relative increase in patient participation in Medicare Advantage plans from 2004 to 2020, with increased enrollment of non-White patients, a propensity for increased Medicare Advantage enrollment in urban environments, and increased arthroplasty care engagement in teaching hospitals. While differences in medical comorbidities were not substantially different between patients enrolled in the 2 plan types, Medicare Advantage patients experienced an increased risk for stroke and acute kidney injury following surgery. The authors extrapolate their findings beyond the core data obtained to present their perspectives on the impact of CMS insurance privatization on the future of high-quality joint arthroplasty care. Increased administrative burdens, including pre-authorization coordination for appropriate and clinically indicated surgical treatment, have been encountered by most practicing surgeons and their support teams. The transition of quality reporting through qualified registries—including the American Joint Replacement Registry—has been built around traditional Medicare enrollment reporting mechanisms. At least 1 potentially unintended consequence of the transition toward Medicare Advantage plans is the shielding of patient-based procedural outcomes from these mechanisms—which may serve to undermine innovation and validation. There are some notable limitations of the study, which the authors have outlined. It is very challenging to use administrative databases to fully identify and investigate all factors that may influence adverse postoperative outcomes. While the database used by the authors identifies postoperative surgical and medical complications, it does not address the long-term performance of the implants and techniques. Moreover, the composite medical complexity of patients may not be fully represented in the analyzed data. The factors and conditions underlying patient decisions to select traditional Medicare or Medicare Advantage plans cannot be assessed, and the potential impact of selection bias on the study findings cannot be determined. The study highlights the unanticipated consequences that may arise when fiscally driven policy intersects with specialized medical care. Future studies will be valuable to determine whether the observations in this study are sustained as the growth of Medicare Advantage plans continues—especially with the trends suggesting that under-represented minority patients will potentially be the most adversely affected. With potential implications for arthroplasty care delivery and the future ability to utilize qualified registries to assess arthroplasty outcomes, it is crucial for advocacy efforts to guide policymakers toward ensuring the successful provision of arthroplasty care—including transparency of outcomes among patients who have elected to participate in Medicare Advantage programs.

D-Dimer, Erythrocyte Sedimentation Rate, and C-Reactive Protein Sensitivities for Periprosthetic Joint Infection Diagnosis

BackgroundThere is contradicting evidence on the diagnostic value of inflammatory biomarkers for periprosthetic joint infection (PJI). We sought to quantify the sensitivity of D-dimer for acute and chronic PJI diagnosis and evaluate D-dimer lab values in the 90-day postoperative window in a control cohort of primary joint arthroplasty patients for comparison. MethodsAn institutional database was queried for patients undergoing revision procedures for PJI after total hip arthroplasty (THA) and total knee arthroplasty (TKA) from 2014 to present. CRP, ESR, and D-dimer were collected within 90 days pre and postoperatively and sensitivities for the diagnosis of PJI were calculated. The control group included patients who underwent a negative diagnostic workup for deep venous thrombosis (DVT) or pulmonary embolus (PE) and had a D-dimer lab collected within 90 days postoperatively from primary total joint arthroplasty (TJA). ResultsA total of 604 PJI patients were identified, and 81 patients had D-dimer, ESR, and CRP collected. There were 50/81 acute PJI patients and 31/81 chronic PJI patients who had median D-dimer values of 2,136.5 ng/mL [interquartile range (IQR): 1,642-3,966.5] and 3,336 ng/mL [IQR: 1,976-5,594]. Only the chronic PJI group had significantly higher D-dimer values when compared to the control cohort (P = .009). The sensitivity of D-dimer was calculated to be 92% and 93.5% in the acute and chronic PJI groups, respectively. ConclusionSerum D-dimer may not have high diagnostic utility for acute PJI, especially in the setting of recent surgery; however, it still may be useful for patients who have chronic PJI.

Racial Disparities in Outcomes of Total Joint Arthroplasty at a Single Institution: Have We Made Progress?

BackgroundHealth disparities disproportionately affect minority groups across the United States with respect to care access, quality, and outcomes. The aim of this study is to examine existing disparities between white and African American (AA) patients regarding postoperative outcomes following total joint arthroplasty and provide insight into disparity trends over a 9-year period. MethodsA retrospective review of 16,779 total joint arthroplasty patients at a single institution between January 2013 and December 2021 was performed. Patients were grouped by race as AA or white. Outcomes of interest included length of stay (LOS), home discharge, 30-day emergency department return, and 30-day readmission. Univariate statistics and multivariate regressions were utilized to analyze results. ResultsSignificant improvements in LOS and rates of home discharge occurred for both white and AA patients at our institution over a 9-year period, while rates of 30-day emergency department returns and readmissions demonstrated a downward but non–statistically significant trend. Despite these trends, AA patients continued to experience longer lengths of stay, less likelihood of 0- or 1-day LOS, and higher risk of nonhome discharge for most years examined. However, after controlling for demographic and comorbidity differences, the differences between groups narrowed over time resulting in no significant differences in the aforementioned 3 measures by 2021. ConclusionsAlthough racial disparities in outcomes are still apparent, over time, the differences in resource utilization between AA and white patients have narrowed. Initiatives aimed at creating healthier communities with increased access to care and the ultimate goal of equitable care must continue to be pursued.

A Validated Pre-operative Risk Prediction Tool for Extended Inpatient Length of Stay Following Primary Total Hip or Knee Arthroplasty

BackgroundAs value-based reimbursement models mature, understanding the potential trade-off between inpatient lengths of stay and complications or need for costly postacute care becomes more pressing. Understanding and predicting a patient’s expected baseline length of stay may help providers understand how best to decide optimal discharge timing for high-risk total joint arthroplasty (TJA) patients. MethodsA retrospective review was conducted of 37,406 primary total hip (17,134, 46%) and knee (20,272, 54%) arthroplasties performed at two high-volume, geographically diverse, tertiary health systems during the study period. Patients were stratified by 3 binary outcomes for extended inpatient length of stay: 72 + hours (29%), 4 + days (11%), or 5 + days (5%). The predictive ability of over 50 sociodemographic/comorbidity variables was tested. Multivariable logistic regression models were created using institution #1 (derivation), with accuracy tested using the cohort from institution #2 (validation). ResultsDuring the study period, patients underwent an extended length of stay with a decreasing frequency over time, with privately insured patients having a significantly shorter length of stay relative to those with Medicare (1.9 versus 2.3 days, P < .0001). Extended stay patients also had significantly higher 90-day readmission rates (P < .0001), even when excluding those discharged to postacute care (P < .01). Multivariable logistic regression models created from the training cohort demonstrated excellent accuracy (area under the curve (AUC): 0.755, 0.783, 0.810) and performed well under external validation (AUC: 0.719, 0.743, 0.763). Many important variables were common to all 3 models, including age, sex, American Society of Anesthesiologists (ASA) score, body mass index, marital status, bilateral case, insurance type, and 13 comorbidities. DiscussionAn online, freely available, preoperative clinical decision tool accurately predicts risk of extended inpatient length of stay after TJA. Many risk factors are potentially modifiable, and these validated tools may help guide clinicians in preoperative patient counseling, medical optimization, and understanding optimal discharge timing.