Pre-operative corticosteroid injection within 1 month of total shoulder arthroplasty is associated with increased risk of periprosthetic joint infection

INTRODUCTION

Corticosteroid injections (CSI) may increase the risk of peri-prosthetic infections (PJI) following total shoulder arthroplasty (TSA). Our study specifically assessed the risk of PJI in patients who received CSI: (1) less than 4 weeks prior to TSA; (2) 4-8 weeks prior to TSA; and (3) 8-12 weeks prior to TSA.

MATERIALS AND METHODS

A national all-payer database was queried to identify patients who underwent TSA with a shoulder osteoarthritis diagnosis from October 1, 2015 to October 31, 2020 (n = 25,422). There were four cohorts: CSI within 4 weeks of TSA (n = 214), CSI 4-8 weeks prior to TSA (n = 473), CSI 8-12 weeks prior to TSA (n = 604), and a control cohort that did not receive CSI (n = 15,486). Bivariate chi-square analyses of outcomes were performed in addition to multivariate regression.

RESULTS

A significant increase in PJI risk at 1 year (Odds Ratio [OR] = 2.29, 95% Confidence Interval [CI] = 1.19-3.99, p = 0.007) and 2 years (OR = 2.03, CI = 1.09-3.46, p = 0.016) in patients who received CSI within 1 month of TSA was noted. PJI risk was not significantly increased at any time point for patients who received a CSI greater than 4 weeks prior to TSA (all p ≥ 0.396).

CONCLUSION

PJI risk is increased at both 1 and 2 years post-operatively in patients who received a CSI within 4 weeks of TSA. Therefore, TSA should be deferred at least 4 weeks after a patient receives a CSI to mitigate PJI risk.

LEVEL OF EVIDENCE

Level III.

Treatment of Periprosthetic Joint Infection in Total Knee Arthroplasty with a Temporary Intramedullary Nail: Is a Long or Short Nail Better?

To our knowledge, no studies have compared postoperative outcomes between patients who received a temporary short or long intramedullary (IM) nail in the setting of infected total knee arthroplasty (TKA). Therefore, the aim of this study was to compare short-term outcomes for patients who underwent long or short IM nail insertion for treatment of periprosthetic knee infection. Specifically, we compared: (1) success rates; (2) patient reported/functional outcomes; and (3) complications between patients implanted with a short or a long IM nail following PJI of the knee. A retrospective chart review was performed for patients who underwent two-stage exchange arthroplasty with a temporary long or short IM nail between November 2010 and June 2018 at our institution (n = 67). Continuous and categorical variables were assessed using t-test/Mann-Whitney U test and chi-squared test, respectively. Logistic regression analyses were conducted to assess the effect of IM nail length on success rate while adjusting for age, sex, body mass index, and race. A total of 36 patients underwent temporary treatment with a long IM nail, while 31 patients received a short IM nail. There were no differences in success rate for reimplanted patients treated with long and short IM nails (odds ratio 0.992; p = 0.847). Fewer patients with a long IM nail went on to reimplantation (52.8 vs. 83.9%; p = 0.007). There was no difference in satisfaction (7.86 vs. 7.68; p = 0.515), pain scores (3.39 vs. 4.45 points; p = 0.126), or Knee Society score outcome scores (150.61 vs. 166.26 points; p = 0.117) between long or short IM nail patients. Following reimplantation, there was no difference in the number of patients who became reinfected (15.8 vs. 11.5%; p = 0.679) or went on to amputation (0 vs. 7.7%; p = 0.210). Periprosthetic joint infection (PJI) is a rare but serious postoperative complication following TKA. Our findings suggest that the use of long and short IM nails during two-stage exchange can have equal utility in PJI patients with severe bone defects.

Utilisation of calcium sulphate beads in one-stage aseptic revision total hip arthroplasty

INTRODUCTION

Periprosthetic joint infection (PJI) affects many revision total hip arthroplasty (THA) patients, contributing to a concomitant rise in revision costs. Means of decreasing the risk of PJI include the use of antibiotic adjuncts, such as calcium sulphate beads (CSBs). Mixed with antibiotics, the potential benefits of CSBs include dissolvability and antibiotic drug elution. However, information comparing them in aseptic revision is scarce. Therefore, this study investigated CSB utilisation for infection prevention in aseptic revision THA. Specifically, we compared (1) infection rates; (2) lengths of stay; (3) subsequent infection procedures; and (4) final surgical outcome in 1-stage aseptic revision THA patients who did received CSBs to 1-stage aseptic revision THA patients who did not.

METHODS

A retrospective chart review was performed to identify all patients who underwent an aseptic revision THA between January 2013 and December 2017. Patients who received CSBs (n = 48) were compared to non-CSB patients (n = 58) on the following outcomes: postoperative infections, lengths of stay (LOS), subsequent irrigation and debridements (I+Ds), and final surgical outcome, classified as successful THA reimplantation, retained antibiotic spacer, or Girdlestone procedure. Chi-square and t-testing were used to analyse the variables.

RESULTS

There was no significant differences found between CSB patients and non-CSB patients in postoperative infections (p = 0.082), LOS (p = 0.179), I+Ds (p = 0.068), and final surgical outcome (p = 0.211).

CONCLUSION

This study did not find any statistical difference between CSBs and standard of care in infection rates and surgical outcomes. The advantage of these beads for 1-stage aseptic revisions is questionable.

National Trends for Reverse Shoulder Arthroplasty After the Affordable Care Act: An Analysis From 2011 to 2015

Few studies have investigated nationwide patient trends and health care costs for reverse shoulder arthroplasty (RSA) after 2014. This study uses a large validated nationwide database to retrospectively assess changes in patient and hospital demographic features, hospital costs, and hospital charges for inpatient RSA procedures before and after implementation of the Affordable Care Act. The National Inpatient Sample database was used to identify all patients who underwent RSA between January 2011 and December 2015, yielding 163,171 patients (63.4% female; mean age, 72 years). Categorical data were assessed with chi-square/Fisher's exact test, and continuous data were assessed with analysis of variance. There was an increased proportion of RSA recipients identifying as Hispanic (4.1% to 4.8%) and Native American (0.1% to 0.4%; P<.0001). The proportion of patients who had Medicaid (1.4% to 2.4%) and private insurance (15.1% to 16.6%) increased as well (P<.0001). A decrease in mean hospital costs occurred between 2011 and 2015 (-$256; P=.002), whereas an increase occurred in hospital charges (+$6,314; P<.001). These findings provide insight on RSA use and patient demographic trends in the United States. Additionally, these results help to capture the effects of extended health coverage and new reimbursement models on hospital costs and charges. [Orthopedics. 2022;45(2):97-102.].

Inpatient dislocation after primary total hip arthroplasty: incidence and associated patient and hospital factors

INTRODUCTION

Inpatient dislocation following total hip arthroplasty (THA) may incur substantial financial penalties for hospitals in the United States. However, limited studies report on current incidence and variability of dislocations. We utilised a large national database to evaluate inpatient hip dislocation trends regarding: (1) yearly incidences; (2) lengths of stay (LOS); (3) demographic factors; and (4) hospital metrics.

METHODS

The National Inpatient Sample was queried from 2012 to2016 for primary THA patients (n = 1,610,155), identifying 2490 inpatient dislocations. Various patient demographics and hospital characteristics were assessed. Multivariate regression analyses were conducted to identify dislocation risk factors.

RESULTS

Dislocation rates increased from 0.11% in 2012 to 0.18% in 2016 (p < 0.001). Dislocated patients experienced significantly longer LOS (p < 0.001). Patient demographic factors associated with dislocation were sex, race, Medicaid insurance, alcohol use disorder, psychosis, hemiparesis/hemiplegia, chronic renal failure, and obesity. Spinal fusion was not associated with inpatient dislocation. Dislocations were likeliest in the South and least likely in teaching hospitals.

CONCLUSION

Inpatient dislocation has increased in recent years. Optimised management and recognition of the patient and hospital factors outlined in this study may help decrease inpatient dislocation risks following THA, thus avoiding hospital reimbursement penalties for this preventable complication.

Two-Stage Exchange Using a Short Intramedullary Nail for Treatment of Periprosthetic Knee Infections: A Technique Worth Questioning

Periprosthetic joint infections (PJIs) following total knee arthroplasty (TKA) are serious orthopaedic complications that pose marked burdens to both patients and health care systems. At our institution, two-stage exchange with a temporary short antibiotic cement-coated intramedullary nail was utilized for the treatment of repeat PJIs in a series of compromised patients with considerable bone loss. This study reports on (1) success rates, (2) functional and pain outcomes, (3) and complications for patients receiving a temporary short intramedullary nail for the treatment of PJI. Our institutional database was queried for all repeat knee PJI patients between March 1st, 2009 and February 28th, 2015. Patients with type II/III Anderson Orthopaedic Research Institute (AORI) bone defects who underwent two-stage exchange arthroplasty with a short antibiotic-coated intramedullary nail were included for analysis (n = 31). Treatment success was determined using the Delphi-based consensus definition of a successfully treated PJI: infection eradication (healed wound with no recurrence of infection by the same organism), no further surgical intervention for infection after reimplantation, and no PJI-related mortality. A paired t-test was performed to assess for continuous variables. A total of 26 patients went on to reimplantation, while 5 patients retained the intramedullary nail. Overall treatment success was 74.2%. Range of motion significantly decreased postoperatively (102.1 vs. 87.3 degrees; p < 0.001), while Knee Society Scores (function) significantly increased (55.6 vs. 77.7, p < 0.001). A majority of patients were full weight-bearing immediately following surgery (38.7%). Treating poor health status patients with PJI of the knee can be difficult after multiple revisions. With a success rate similar to conventional methods, our results demonstrate that two-stage exchange with a temporary short intramedullary nail may be a desirable treatment option for patients with bony defects wishing to avoid amputation or permanent arthrodesis. However, this method does not outperform other treatment modalities, and may not be suitable for all patients. Patient expectations and health status should be carefully assessed to determine if this procedure is appropriate in this complex patient population.

Complications Associated With Same-Day Bilateral Total Knee Arthroplasties

Same-day bilateral total knee arthroplasties (SBTKAs) are associated with shorter rehabilitation and lower cost. However, controversy surrounding the safety of SBTKAs exists. Recent studies are lacking to determine whether patient selection has brought SBTKA in line with unilateral total knee arthroplasty (UTKA). Therefore, the authors evaluated and compared patient characteristics, hospital characteristics, and inpatient course between UTKA and SBTKA from 2009 to 2016. The National Inpatient Sample was queried from 2009 to 2016 for UTKA and SBTKA patients. Of the 5,329,466 patients identified, 5,084,328 (95.4%) patients received UTKAs and 245,138 (4.6%) patients underwent SBTKAs. Incidence, rate, patient and hospital characteristics, health status, length of stay (LOS), discharge disposition, hospital charges, hospital costs, and complications were analyzed and statistically compared. The incidence (-1.4%) and rate (15.8%) of SBTKAs decreased (both P<.001). The SBTKA cohort had more patients who were younger, male, White, obese, healthier, and using private insurance (P<.001 for all). The SBTKA cohort had longer LOS, a higher proportion of discharges to skilled nursing facilities, higher cost and charges, and more complications, including deep venous thromboses/pulmonary emboli (DVT/PE) and transfusions (P<.001 for all). Conversely, SBTKA was associated with fewer myocardial infarctions (P<.001). Although improved from previous literature, SBTKA is still associated with longer LOS, higher cost and charges, and more complications, including DVT/PE and transfusions, although with a lower rate of myocardial infarction. However, studies are needed to determine whether the risk of 1 SBTKA outweighs the cumulative risk of staged UTKAs. [Orthopedics. 2021;44(3):e407-e413.].

Wide-awake Local Anesthesia with No Tourniquet: An Updated Review

The wide-awake local anesthesia with no tourniquet (WALANT) technique has become popularized for various hand/upper extremity procedures. Before surgery, patients receive local anesthetic, consisting of lidocaine with epinephrine, and remain awake for the entire procedure. The purpose of this review was to investigate the advantages, diverse application, outcomes, cost benefits, use in challenging environments, patient considerations, and contraindications associated with WALANT.

METHODS

A comprehensive review of the literature on the WALANT technique was conducted. Search terms included: WALANT, wide-awake surgery, no tourniquet, local anesthesia, hand, wrist, cost, and safety.

RESULTS

The WALANT technique has proven to be successful for common procedures such as flexor tendon repair, tendon transfer, trigger finger releases, Depuytren disease, and simple bony procedures. Recently, the use of WALANT has expanded to more extensive soft-tissue repair, fracture management, and bony manipulation. Advantages include negating preoperative evaluation and testing for anesthesia clearance, eliminating risk of monitored anesthesia care, removal of anesthesia providers and ancillary staff, significant cost savings, and less waste produced. Intraoperative evaluations can be performed through active patient participation, and postoperative recovery and monitoring time are reduced. WALANT is associated with high patient satisfaction rates and low infection rates.

CONCLUSIONS

The WALANT technique has proven to be valuable to both patients and providers, optimizing patient satisfaction and providing substantial healthcare savings. As its application continues to grow, current literature suggests positive outcomes.

Pain intensity in total hip arthroplasty patients: how communication influences satisfaction

INTRODUCTION

An important global measure of health care quality is patient satisfaction. Patient satisfaction partially determines hospital reimbursement for procedures such as total hip arthroplasty (THA). Press Ganey (PG) survey responses assess patient satisfaction, and impact reimbursement. Current efforts to maximise repayment for THA include reducing postoperative pain. The "Pain Management" survey domain is considered a significant factor in patient ratings, but other studies have highlighted staff communication domains as determinants of satisfaction. Therefore, the purpose of this study is to compare PG survey responses to inpatient pain intensity.

METHODS

We queried the PG database for all patients who underwent a THA between November 2012 and January 2015. This yielded a total of 302 patients. Descriptive statistics were performed to analyse patient-level demographics. A multivariate regression model was constructed utilising pain intensity as the dependent variable.

RESULTS

Patients rating of "Communication with Doctors" (B = -25.534; p < 0.001) and "Communication about Medicines" (B = -31.49; p = < 0.001) domains were representative of patient pain intensity. No other factors demonstrated a significant relationship to pain intensity.

CONCLUSIONS

Patient satisfaction continues to be important in care quality. Surrogate markers, such as the PG survey, can guide institutions looking to improve care. Our study revealed scores for "Communication with Doctors" and "Communication about Medicines" best represented true pain intensity levels for THA recipients during the postoperative period. The "Pain Management" domain did not display a relationship to pain intensity. The current method of measuring patient satisfaction should be reassessed to better represent patient responses and outcomes.

Changes in Total Knee Arthroplasty Utilization since the Implementation of ACA: An Analysis of Patient-Hospital Demographics, Costs, and Charges

The Patient Protection and Affordable Care Act (PPACA) formed the Center for Medicare and Medicaid Innovation Center which has implemented experimental reimbursement models targeted at high-demand procedures to improve care quality. However, the effect of health care reform on total knee arthroplasty (TKA) procedures has not been explored. This study explores patient-hospital level demographics, inpatient costs, and charges related to TKA procedures between 2009 and 2015. The National Inpatient Sample database was utilized to identify patients who received primary TKA between January 2009 and October 2015 (4,283,387 cases). Categorical, continuous, and ordinal data were analyzed using chi-square/Fisher's exact test, t-test/analysis of variance, or Kruskal-Wallis' test, respectively. There was an increase in proportion of TKA recipients belonging to minority groups and the lowest quartile of median income (p < 0.05). There was a 1.9% increase in recipients using Medicaid as a primary payor and volume shifts from urban nonteaching toward urban teaching hospitals. There was a reduction in mean length of stay and mean inpatient costs. There were increases in hospital charges, but reductions in rates of inpatient mortality, and other postoperative complications. TKA procedures remain the most common surgical procedure; therefore, our study assessed national trends to capture the effect of PPACA. We found an increasing proportion of TKA recipients belonging to minority and low-income groups, volume shifts to urban teaching hospitals, and lower costs of care. These findings may be useful in objectively critiquing the effects of PPACA on TKA-related care.

Pain Intensity: How Press Ganey Survey Domains Correlate in Total Knee Arthroplasty Patients

Decreasing postoperative pain for total knee arthroplasty (TKA) patients has been an area of continued effort for healthcare providers. These efforts have been incentivized by legislative reform, which ties reimbursement for hospitals and providers to patient perception of care. Press Ganey (PG) surveys quantify patient satisfaction, and the "pain management" domain is thought to be the best metric for assessing pain intensity. Therefore, these responses are important, as they are used to guide further improvements in healthcare delivery. This study analyzes which PG survey domains are truly associated with pain intensity in the immediate postoperative period following TKA. We queried our PG database for all primary TKA patients between November 2012 and January 2015, yielding a total of 214 patients. Multivariate regression analysis was performed utilizing pain intensity as the dependent variable. Predictor variables included body mass index (BMI), Charlson's comorbidity index, opioid consumption, and PG survey domains. Patient ratings of "communication with doctors" (B = 58.147; p = 0.001), "responsiveness of hospital staff" (B = - 62.663; p = 0.041), "communication about medicines" (B= -45.037; p < 0.001), and "hospital environment" (B = 69.342; p = 0.017) were associated with patient pain intensity. We found survey domains, other than "pain management," were associated with pain intensity. Efforts to improve outcomes and satisfaction should focus on staff education and communication. The current method for measuring patient satisfaction and reimbursement should be critically assessed and redesigned to better reflect true patient experiences.

Cementless versus Cemented Fixation in Total Knee Arthroplasty: Usage, Costs, and Complications during the Inpatient Period

Cemented fixation has been the gold standard in total knee arthroplasty (TKA). However, with younger and more active patients requiring TKA, cementless (press-fit) fixation has sparked renewed interest. Therefore, we investigated differences in (1) patient demographics, (2) inpatient costs, (3) short-term complications, and (4) discharge disposition between patients who underwent TKA with cemented and cementless fixation. The National Inpatient Sample database was queried for TKA patients with cement or cementless fixation between October 1 and December 31, 2015. Primary outcomes of interest included complications, length of stay (LOS), discharge disposition, and inpatient costs. Student's t-test and chi-square analysis were used to assess continuous and categorical data, respectively. Multivariable analysis evaluated the effects of fixation type on the continuous and categorical dependent variables. Patients who received cementless fixation were more often younger (63.5 vs. 65.9 years), male (47.4 vs. 40.3%), Black (10.7 vs. 7.7%), from the Northeast census region (29.1 vs. 17.1%), and under private insurance (49.2 vs. 40.3%; p < 0.001 for all). Cementless fixation involved higher inpatient hospital costs (US$17,357 vs. US$16,888) and charges (US$67,366 vs. US$64,190; p < 0.001 for both), lower mean LOS (2.63 vs. 2.71 days; p < 0.001), and higher odds of being discharged to home (odds ratio = 1.99; p = 0.002). This study revisited the outcomes of TKA with cementless fixation and demonstrated higher inpatient charges and costs, shorter mean LOS, and higher odds of being discharged home. Future studies should investigate patient outcomes and complications past the inpatient period, evaluate long-term survivorship and failure rates, and implement a prospective study design.

Influence of the Maryland All-Payer Model on Primary Total Knee Arthroplasties

In 2014, Maryland received a waiver for the Global Budget Revenue (GBR) program. We evaluated GBR's impact on patient and hospital trends for total knee arthroplasty (TKA) in Maryland compared with the U.S. Specifically, we examined (1) patient characteristics, (2) inpatient course, and (3) costs and charges associated with TKAs from 2014 through 2016.

METHODS

A comparative analysis of TKA-treated patients in the Maryland State Inpatient Database (n = 36,985) versus those in the National Inpatient Sample (n = 2,117,191) was performed. Patient characteristics included race, Charlson Comorbidity Index (CCI), morbid obesity, patient income status, and primary payer. Inpatient course included length of hospital stay (LOS), discharge disposition, and complications.

RESULTS

In the Maryland TKA cohort, the proportion of minorities increased from 2014 to 2016 while the proportion of whites decreased (p = 0.001). The proportion of patients with a CCI of ≥3 decreased (p = 0.014), that of low-income patients increased (p < 0.001), and that of patients covered by Medicare or Medicaid increased (p < 0.001). In the U.S. TKA cohort, the proportion of blacks increased (p < 0.001), that of patients with a CCI score of ≥3 decreased (p < 0.001), and the proportions of low-income patients (p < 0.001) and those covered by Medicare or Medicaid increased (p < 0.001). In both Maryland and the U.S., the LOS (p < 0.001) and complication rate (p < 0.001) decreased while home-routine discharges increased (p < 0.001). Costs and charges decreased in Maryland (p < 0.001 for both) whereas charges in the U.S. increased (p < 0.001) and costs decreased (p < 0.001).

CONCLUSIONS

While the U.S. health reform and GBR achieved similar patient and hospital-specific outcomes and broader inclusion of minority patients, Maryland experienced decreased hospital charges while hospital charges increased in the U.S.

LEVEL OF EVIDENCE

Economic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Rehabilitation protocols following total knee arthroplasty: a review of study designs and outcome measures

Total knee arthroplasty (TKA) is among the most common elective procedures performed worldwide. Recent efforts have been made to significantly improve patient outcomes, specifically with postoperative rehabilitation. Despite the many rehabilitation modalities available, the optimal rehabilitation strategy has yet to be determined. Therefore, this systematic review focuses on evaluating existing postoperative rehabilitation protocols. Specifically, this review analyses the study designs, rehabilitation methods, and outcome measures of postoperative rehabilitation protocols for TKA recipients in the past five years. The PubMed, EMBASE, and Cochrane Library databases were queried for studies evaluating rehabilitation protocols following primary TKA. Of the 11,013 studies identified within the last five years, 70 met the inclusion and exclusion criteria. After assessing for relevance and removing duplicates, a final count of 20 studies remained for analysis. Level-of-evidence was determined by the American Academy of Orthopaedic Surgeons (AAOS) classification system. Our findings demonstrated that continuous passive motion and inpatient rehabilitation may not provide additional benefit to the patient or healthcare system. However, early rehabilitation, telerehabilitation, outpatient therapy, high intensity, and high velocity exercise may be successful forms of rehabilitation. Additionally, weight-bearing biofeedback, neuromuscular electrical stimulation, and balance control appear to be beneficial adjuncts to conventional rehabilitation. Postoperative rehabilitation following TKA facilitates patient recovery and improves quality of life. This systematic review analyzed the existing rehabilitation protocols from the past five years. Some studies did not accurately describe the conventional rehabilitation protocols, the duration of therapy sessions, and the timing of these sessions. As such, future studies should explicitly describe their methodology. This will allow high-quality assessments and the conception of standardized protocols.

Short-term outcomes of the supine muscle-sparing anterolateral versus direct lateral approach to primary total hip arthroplasty

BACKGROUND

Although total hip arthroplasty (THA) is among the most successful orthopaedic procedures, it is not without complications. As such, finding the optimal surgical approach has become an area of particular interest. In this study, we compare: (1) pain intensity; (2) opioid consumption; (3) lengths of stay (LOS); (4) complication rates; (5) discharge destination; and (6) ambulatory function between patients who underwent THA via the supine muscle-sparing anterolateral (MS-ALA) and conventional direct lateral (DLA) approaches.

METHODS

A retrospective analysis was conducted on 220 consecutive patients who received primary THA using the supine MS-ALA (n = 101) or DLA (n = 119) between 1 January 2014 and 31 December 2016. Outcomes included postoperative pain intensity, opioid consumption, LOS, discharge destination, complications, additional procedures, and time to independent ambulation.

RESULTS

We demonstrated significantly lower opioid consumption on postoperative days (POD) 1 and 2 (mean differences, -32.0 and -28.4 mg, respectively; p ⩽ 0.001) and decreased pain intensity during the second 24 hours of the hospital stay (mean difference, -22.0; p < 0.001) in patients receiving the MS-ALA. Relative to the DLA cohort, patients in the MS-ALA cohort were 2.04 times more likely to be discharged to home (p = 0.028) and 1.91 times less likely to experience postoperative abductor insufficiency (p = 0.039).

CONCLUSION

The present study is the 1st to compare postoperative outcomes, particularly pain intensity and opioid consumption, between the supine muscle-sparing anterolateral and direct lateral THA approaches. Further research should investigate the effect of surgical approach on quality and cost of care, include larger sample sizes, and involve longer-term follow-up.

Adjunctive Intravenous Diclofenac Decreases Opioid Consumption and Increases Satisfaction in the Primary Total Hip Arthroplasty Population

Despite the success of total hip arthroplasty (THA), postoperative pain management remains a concern. Although the nonsteroidal anti-inflammatory drug (NSAID) intravenous (IV) diclofenac is a promising addition, its impact on THA outcomes has not been investigated. This study evaluates the effects of adjunctive IV diclofenac on: 1) postoperative pain intensity; 2) opioid consumption; 3) discharge destination; 4) length of stay; and 5) patient satisfaction in primary THA patients. A retrospective study was performed for patients who underwent primary THA by a single surgeon between May 1 and September 31, 2017. Patients of the study group (n=25) were treated postoperatively with IV diclofenac and the standard pain control regimen while the control group (n=88) did not receive diclofenac. Patients receiving adjunctive IV diclofenac were more likely to be discharged home than to inpatient facilities (O.R. 4.02; p=0.049). Patient satisfaction with respect to how well and how often pain was controlled (p= 0.0436 and p=0.0217, respectively) was significantly greater in the IV diclofenac group. Patients who received IV diclofenac had lower opioid consumption on postoperative days one and two (-67.2 and -129.0mg, respectively; p=0.001 for both). The growth of THA as an outpatient procedure has intensified the urgency of improving postoperative pain management. This study demonstrates that THA patients receiving adjunctive IV diclofenac were more likely to be discharged home, had reduced opioid consumption, and experienced greater satisfaction. To further investigate the optimal regimen, future studies comprising a larger cohort and comparing IV diclofenac to other NSAIDs are warranted.

Biologic Therapies for the Treatment of Knee Osteoarthritis

BACKGROUND

The use of biologic therapies for the management of knee osteoarthritis has increased, despite insufficient evidence of efficacy. Our aim was to complete a systematic review and analysis of reports utilizing the highest level-of-evidence evaluating: (1) platelet-rich plasma injections (PRPs); (2) bone marrow-derived mesenchymal stem cells (BMSCs); (3) adipose-derived mesenchymal stem cells (ADSCs); and (4) amnion-derived mesenchymal stem cells (AMSCs).

METHODS

PubMed, Embase, and Cochrane Library databases were queried for studies evaluating PRP injections, BMSCs, ADSCs, and AMSCs in patients with knee osteoarthritis. Of 1009 studies identified within the last 5 years, 123 met inclusion criteria. A comprehensive analysis of all levels-of-evidence was performed, as well as separate analysis on level-of-evidence I studies. Level-of-evidence was determined by the American Academy of Orthopedic Surgeons classification system.

RESULTS

Although the majority of PRP reports demonstrated improvements in pain and/or function, others revealed no substantial improvements. Similar findings were noted for BMSCs, ADSCs, and AMSCs. Assessments of BMSC studies yielded majority with positive clinical results, although short-lived. Studies on ADSCs revealed improved clinical outcomes, but equivocal radiographic outcomes. Studies evaluating AMSCs demonstrated improvements in pain and function, and decreased radiographic evidence of osteoarthritis.

CONCLUSION

Despite some promising early results for PRP, BMSC, ADSC, and AMSC therapies, the majority of level-of-evidence I studies have multiple problems: small sample sizes, potentially inappropriate control cohorts, short-term follow-up, and so on. Despite the limitations, there still appears to be evidence justifying their use for knee osteoarthritis management. More high-level, larger human studies utilizing standardized protocols are needed.

Global Budget Revenue on a Single Institution's Costs, Outcomes, and Patient Quality Metrics in Patients Undergoing Total Knee Arthroplasty

BACKGROUND

Maryland was granted a waiver to implement a Global Budget Revenue (GBR) reimbursement model. Statewide results for combined medical and surgical services have been reported for fiscal years 2015 and 2016. A paucity of studies exists exploring the change in care costs and outcomes for total knee arthroplasty (TKA) recipients under GBR. This study aims to assess the effects of GBR on cost of care and resource utilization related to TKA at a single institution before and after GBR.

METHODS

The Maryland Center for Medicare and Medicaid Services database was used to find Medicare patients who underwent TKA at a single institution before (2012-2013) and after (2014-2015) GBR. A total of 150 and 161 TKAs were performed in 2012 and 2015. Cost differences were compared for each inpatient care episode, postacute care period, and readmissions. We also evaluated differences in length of stay, discharge disposition, and complication rates.

RESULTS

Mean inpatient cost was significantly lower in 2015 vs 2012 (P = .0014); however, analysis of postacute costs showed a nonsignificant increase in price between years (P = .1008). We demonstrated significant increase in home health (P < .0001) and significant decrease in acute rehabilitation (P = .0481). Durable medical equipment costs significantly decreased (P = .0087).

CONCLUSION

We demonstrate lower mean inpatient costs since GBR initiation. We reveal increased mean postacute care costs, which may be due to increased acuity for patients needing postacute care. Our results show nonsignificant reductions in length of stay, complications, and increased rate of home discharge, suggesting GBR may be effective in orchestrating reduced costs for TKA at high-volume institutions.

Does the Amount of Opioid Consumed Influence How Patients Rate Their Experience of Care After Total Knee Arthroplasty?

BACKGROUND

With legislative efforts aimed at optimizing value of care, surgeons performing total knee arthroplasty (TKA) are faced with increased responsibility of optimizing patient perception of care. However, pain after TKA may negatively influence patient perception of care, as measured by Press Ganey (PG) patient satisfaction surveys. While opioid-based medications are best suited for acute pain alleviation, awareness of a growing opioid epidemic has spurred efforts to reduce its administration. Therefore, this study assessed the correlation between postoperative opioid consumption and 7 PG question domains: (1) overall hospital rating; (2) communication with nurses; (3) response time of hospital staff; (4) communication with doctors; (5) hospital environment; (6) pain management and; (7) communication about medication.

METHODS

We reviewed our institutional PG database for TKA patients from 2011 to 2014. A total of 406 patients were analyzed (mean age = 66, 73.4%). Opioid consumption was measured using a morphine milliequivalent conversion algorithm. Bivariate correlation analysis assessed the association between opioid consumption and PG domains. Spearman's r was utilized to assess the strength of the association.

RESULTS

No association between total opioid consumption and overall hospital rating (r = 0.044), communication with doctors (r = 0.080), communication with nurses (r = 0.072), responsiveness of hospital staff (r = 0.084), pain management (r = 0.100), communication about medicines (r = 0.083), or hospital environment (r = 0.155) were found.

DISCUSSION

Our findings demonstrate that PG scores are not influenced by immediate postoperative opioid use. These results suggest opioid-based pain medications should be administered exclusively on the basis of clinical guidelines and patient needs without concern regarding satisfactions scores and reimbursement penalties.

Clostridium difficile infection in the USA: incidence and associated factors in revision total knee arthroplasty patients

INTRODUCTION

Revision total knee arthroplasty (TKA) procedures performed secondary to periprosthetic joint infection (PJI) are associated with significant morbidity and mortality. These poor outcomes may be further complicated by postoperative infection requiring antibiotics. However, antibiotic overuse may suppress patients' bacterial flora, leading to Clostridium difficile infection (CDI). Therefore, we aimed to study the: (1) incidence; (2) costs; and (3) risk factors associated with CDI in revision TKA patients.

METHODS

The National Inpatient Sample database was queried for individuals diagnosed with PJI who underwent revision TKA between 2009 and 2013 (n = 83,806). Patients who developed CDI during their inpatient stay were identified (n = 799). Logistic regression analysis was conducted to assess the association between hospital- and patient-specific characteristics and the development of CDI.

RESULTS

The incidence of CDI after revision TKA was 1.0%. These patients were older (mean age 69.05 vs. 65.52 years), had greater LOS (median 11 vs. 5 days) and greater costs ($30,612.93 vs. 18,873.75), and experienced higher in-hospital mortality (3.6 vs. 0.5%; p < 0.001 for all) compared to those without infection. Patients with CDI were more likely to be treated in urban, not-for-profit, medium/large hospitals in the Northeast or Midwest (p < 0.05 for all) and to have underlying depression (OR 4.267; p = 0.007) or fluid/electrolyte disorders (OR 3.48; p = 0.001).

CONCLUSION

Although CDI is rare following revision TKA, it can have detrimental consequences. We demonstrate that CDI is associated with longer LOS, higher costs, and greater in-hospital mortality. With increased legislative pressure to lower healthcare expenditures, it is crucial to identify means of preventing costly complications.

Opiate Pain Medication Consumption in Cigarette Smokers following Total Hip Arthroplasty

Purpose  The purpose of the present study was to assess perception of pain and pain management in smokers versus nonsmokers who received a total hip arthroplasty (THA).

Methods  Patients who underwent THA from 2010 to 2016 were propensity score matched 1:1 based on race, body mass index, age, and sex. This yielded 124 smokers and 124 nonsmokers. Pain intensity was quantified using area under the curve for visual analog scale pain scores. Opioid consumption was determined using a morphine milliequivalent (mEq) conversion algorithm. An independent samples t -test and Chi-square analysis was conducted to assess continuous and categorical variables respectively.

Results  Smokers experienced a nonsignificantly increased pain intensity (198.1 vs. 185.7; p  = 0.063). Smokers demonstrated significantly higher opioid consumption in both immediate postoperative (65.9 vs. 59.3 mEq; p  = 0.045) and 90 days postoperative periods (619.9 vs. 458.9 mEq; p  = 0.029).

Conclusion  Our study demonstrated a nonsignificantly increased pain intensity, and (in both the immediate and 90 days postoperative periods) a significantly higher opioid consumption following THA in patients who smoke cigarettes. This may be due to a relatively small effect size, warranting the need for larger prospective studies. Nevertheless, arthroplasty surgeons should encourage preoperative smoking cessation and alternative nonopioid analgesics to smoking patients receiving THA.

Level of Evidence  This is a level III, retrospective cohort study.

Use of new interactive patient-provider software improves patient satisfaction and outcomes-a retrospective single-center study

Background

While a number of studies have explored patient- and provider-related factors contributing to quality of care, few studies have explored the role of technology in improving quality and optimizing patient-provider communication. This study explores the use of an interactive patient-provider software platform (IPSP) at a single institution. Specifically, we compared: (1) patient satisfaction scores, (2) complication rates, and (3) readmission rates before and after the use of an IPSP on patients undergoing total hip arthroplasty and total knee arthroplasty.

Material and Methods

A retrospective review was performed on all total hip arthroplasty and total knee arthroplasty patients who completed a Press Ganey survey at a single institution between the years 2014 and 2017. Primary outcomes included Press Ganey patient satisfaction scores and 90-day complication and readmission rates. Mann-Whitney U testing and chi-squared analyses were conducted to assess continuous and categorical variables, respectively.

Results

Analysis revealed an improvement in median Clinician and Group Consumer Assessment of Healthcare Providers and Systems (89 vs 97) and Hospital for Consumer Assessment of Healthcare Providers and Systems scores (9 vs 10; P < .001) between pre-IPSP and post-IPSP. There was a decrease in 90-day complication rates (17.3 vs 11.2%; P = .035) but no decrease in readmission rates (0.30 vs 0.18%, P = .322) between the 2 time points.

Conclusions

The use of an IPSP proved instrumental in improving patient satisfaction and lowering 90-day complication rates at a single institution. The implementation of an IPSP may prove beneficial to arthroplasty surgeons and health-care institutions alike seeking to optimize the quality of care. Larger multicenter studies are necessary to validate the results of the present study.

Short-term outcomes for total knee arthroplasty patients with active extension lag

Background

Despite the success of total knee arthroplasty (TKA), quadriceps strength can fail to recover. Active extension lag [quadriceps lag (Q-lag)] is a function of quadriceps weakness. Q-lag presents itself in patients who maintain a full passive range of motion (ROM), but are limited in active extension ROM. Few studies have evaluated the outcomes of post-TKA patients in the presence of post-operative Q-lag. Thus, this study aims to compare: (I) pain scores; and (II) rates of readmission to physical therapy (PT) in TKA patients with Q-lag of ≥15 degrees to patients without Q-lag.

Methods

A retrospective review of primary TKA patients between 2013 and 2015 was performed. A total of 150 patients (mean age 63.0 years) with a mean follow-up of 30.7 months were analyzed. All patients received an evidence-based protocol for PT at our institution. Patient readmission to PT was recorded if the orthopedic surgeon wrote an additional prescription for PT intervention following the standard of care following TKA. An independent samples t-test and chi-square analysis was conducted to assess the continuous and categorical variables, respectively.

Results

Fifty-one patients had Q-lag ≥15 degrees and 97 patients had Q-lag <15 degrees. Analysis of mean pain scores between the groups demonstrated a significant difference in mean pain scores (1.9 vs. 3.9; P=0.043). Chi-square analysis demonstrated no significant difference in rates of PT readmission between patients who presented with Q-lag, and patients without Q-lag (23.5% vs. 13.4%; P=0.118).

Conclusions

There was no significant difference in readmission rates; however, patients with Q-lag experienced a clinically significant higher pain level. Since this is the first study of its kind, we suggest further investigations on the effect of Q-lag on patient outcomes following primary TKA.

Trends in Total Hip Arthroplasty Under the Patient Protection and Affordable Care Act: A National Database Analysis Between 2008 and 2015

The Patient Protection and Affordable Care Act expanded health coverage for low-earning individuals and families. With more Americans having access to care, the use of elective procedures, such as total hip arthroplasty (THA), was expected to increase. Therefore, the aim of this study was to evaluate trends in THA before and after the initiation of the Patient Protection and Affordable Care Act regarding race, age, body mass index, and sex between 2008 and 2015. The National Surgical Quality Improvement Program database was queried for all individuals who had undergone primary THA between 2008 and 2015. This yielded a total of 104,209 patients. Descriptive statistics were used to analyze patient-level data. A Cochran-Armitage test assessed trends in categorical data points over time. Analysis indicated an increased percentage of blacks or African Americans undergoing THA (7.8% vs 9.2%, P<.001), followed by Native Americans or Pacific Islanders (0.0% vs 0.4%, P<.001), American Indians or Alaskan Natives (0.3% vs 0.5%, P=.016), and Asians (1.4% vs 1.5%, P=.002). An increased percentage of patients 55 to 80 years old received THAs (68.6% vs 74.1%, P<.001). The percentage of patients with a body mass index of 25.0 to 29.9 kg/m², 30.0 to 34.9 kg/m², and 35.0 to 39.9 kg/m² increased (32.9% vs 33.1%, 24.2% vs 25.6%, 12.6% vs 13.3%, respectively, P<.001 for all). These findings may provide insight on the changing patient characteristics for orthopedic surgeons performing THA. Furthermore, these findings may inform health policy makers interested in increasing access to procedures underutilized by specific patient populations and the creation of strategies to meet increased demand. [Orthopedics. 2018; 41(4):e534-e540.].

Use of Neuromuscular Electrical Stimulation During Physical Therapy May Reduce the Incidence of Arthrofibrosis After Total Knee Arthroplasty

INTRODUCTION

Arthrofibrosis remains a major complication following total knee arthroplasty (TKA) that negatively impacts patient outcomes and exhausts healthcare resources. The use of neuromuscular electrical stimulation (NMES) has demonstrated the ability to facilitate quadriceps muscle recovery and reduce pain. Therefore, the purpose of this study was to compare TKA patients who received physical therapy (PT) and adjuvant NMES therapy versus physical therapy alone in terms of: 1) rates of manipulation under anesthesia (MUA) to treat arthrofibrosis; and 2) post-therapy range of motion (ROM).

MATERIALS AND METHODS

This was a retrospective review of TKA patients from multiple institutions who underwent physical therapy versus physical therapy and adjuvant NMES therapy following primary TKA. A total of 206 patients were reviewed in the two cohorts that either received PT alone (n=86) or PT and adjuvant NMES therapy (n=120). Data regarding the requirement of MUA postoperatively for treatment of arthrofibrosis were collected for every patient. Additionally, pre- and post-therapy knee ROM data was also collected. Outcomes in both cohorts were then compared and analyzed.

RESULTS

Lower rates of arthrofibrosis requiring MUA were recorded in patients who used NMES therapy and PT when compared to PT alone (7.5% vs. 19.8%; p=0.009). Log regression analysis revealed lower odds of needing MUA in patients who utilized NMES therapy in adjunct with PT (odds ratio [OR]=0.36; 95% CI: 0.115 to 0.875; p=0.023). Patients who received the NMES therapy were shown to have a statistically greater mean improvement in ROM when compared to those patients who did not receive NMES (+2.63, p=0.04). Log regression analysis also demonstrated that post-PT ROM decreased the odds of receiving MUA with a larger ROM (OR=92; 95% CI: 0.824 to 0.9855; p<0.001).

CONCLUSION

This study demonstrated that the use of NMES during PT may reduce the incidence of arthrofibrosis and improve patient ROM. Prospective, randomized controlled, and larger-scale studies are needed to validate these results. Nevertheless, this novel report demonstrated the positive outcomes for a new application of the NMES therapy.

Risk Factors and Costs Associated With Clostridium difficile Colitis in Patients With Prosthetic Joint Infection Undergoing Revision Total Hip Arthroplasty

BACKGROUND

With the increased demand for primary total hip arthroplasty (THA) and corresponding rise in revision procedures, it is imperative to understand the factors contributing to the development of Clostridium difficile colitis. We aimed to provide a detailed analysis of: (1) the incidence of; (2) the demographics, lengths of stay, and total costs for; and (3) the risk factors and mortality associated with the development of C. difficile colitis after revision THA.

METHODS

The National Inpatient Sample database was queried for all individuals diagnosed with a periprosthetic joint infection and who underwent all-component revision THA between 2009 and 2013 (n = 40,876). Patients who developed C. difficile colitis during their inpatient hospital stay were identified. Multilevel logistic regression analysis was conducted to assess the association between hospital- and patient-specific characteristics and the development of C. difficile colitis.

RESULTS

The overall incidence of C. difficile colitis after revision THA was 1.7%. These patients were significantly older (74 vs 65 years), had greater lengths of hospital stay (19 vs 9 days), accumulated greater costs ($51,641 vs $28,282), and were more often treated in an urban hospital compared to their counterparts who did not develop C. difficile colitis (P < .001 for all). Patients with colitis also had a significantly higher in-hospital mortality compared to those without (5.6% vs 1.4%; P < .001).

CONCLUSION

While C. difficile colitis infection is an uncommon event following revision THA, it can have potentially devastating consequences. Our analysis demonstrates that this infection is associated with a longer hospital stay, higher costs, and greater in-hospital mortality.

Management of Injuries to the Medial Patellofemoral Ligament: A Review

The medial patellofemoral ligament (MPFL) is thought to be the most important medial structure providing restraint to lateral subluxation of the patella. After an initial patellar dislocation, the MPFL is frequently injured and can usually be treated with conservative measures. However, these patients often suffer from recurrent dislocations, which thereby necessitate operative intervention. In the setting of normal anatomy and kinematics, isolated reconstruction of the MPFL is an effective treatment for preventing recurrent dislocations. Various surgical techniques have been described, with differences in fixation and graft selection. The treatment of MPFL injuries should aim to provide patellar stabilization and restore normal kinematics throughout the joint. This review will discuss the following: (1) anatomy of the MPFL, (2) presentation and assessment of MPFL injuries, (3) management of patients with MPFL injuries, and (4) complications following MPFL reconstruction.

Impact factors of orthopaedic journals between 2010 and 2016: trends and comparisons with other surgical specialties

Background

With increased legislative efforts to utilize evidence-based medicine as a guide for clinical practice, orthopaedists feel increasing pressure to publish research in higher-quality journals that reach a larger audience. Impact factor (IF) is used to quantify and rank journal apparent quality, and is the most standardized method for journal appraisal. In this study, we assessed the trends for IF among orthopaedic journals and compared these trends to those of medicine and general surgery journals.

Methods

Journal IFs from Journal Citation Reports (JCR) between the years 2010 to 2016 were obtained and analyzed for trends. Only journals that were considered primarily orthopaedic journals were included. The top 10 journals by IF in both internal medicine and surgery were also included for comparison. Each journal was analyzed by IF, and trends across time were noted. The differences in mean IF between orthopaedic specialty groups were analyzed using an independent samples t-test.

Results

The mean IF of orthopaedic increased from 1.4 (range, 0.0-3.9) in 2010 to 1.9 (range, 0.5-5.7) in 2016. In 2016, the percentage of English journals increased to 87.3% (n=48), while the percentage of journals published in the United States was 47.3% (n=26). There was a significant difference between the IF of journals published in English and those published in other languages (P=0.004). The mean IF of both general and specialized orthopaedic journals increased from 2010 to 2016, but the difference was nonsignificant. The mean IF of the top 10 journals in both surgery and internal medicine also increased from 2010 to 2016, but the increase was also nonsignificant.

Conclusions

Overall, the mean IF for peer-reviewed orthopaedic journals has increased in the past years, as has the number of journals. English journals from the United States continue to have the largest impact when compared to non-English journals and journals from outside the United States. Future studies should aim to better qualify journal impact, while limiting confounders such as self-citation.

Patients With Major Depressive Disorder Experience Increased Perception of Pain and Opioid Consumption Following Total Joint Arthroplasty

BACKGROUND

Pain in the immediate postoperative period following total joint arthroplasty is influenced by various patient factors, including major depressive disorder (MDD). Therefore, this study aimed to compare the patient perception of pain and opioid consumption between patients with and without MDD who received either a total knee arthroplasty (TKA) or total hip arthroplasty (THA). Specifically, we compared (1) pain intensity, (2) lengths of stay, (3) opioid consumption, and (4) patient perception of pain control.

METHODS

We reviewed our institutional Press Ganey database to identify patients with a diagnosis of MDD who received a THA (n = 48) and TKA (n = 68) between 2012 and 2016. An independent samples t-test and chi-square analyses were conducted to assess continuous and categorical variables, respectively. Analysis of covariance assessed the effects of depression on postoperative pain intensity. Mixed-design analysis of variance assessed the difference in opioid consumption between groups.

RESULTS

Patients with MDD who received THA or TKA demonstrated a higher mean pain intensity score when compared to those without MDD; however, this was not statistically different (235.6 vs 207.7; P = .264 and 214.8 vs 185.1; P = .055, respectively). Patients with MDD who received THA or TKA consumed more opioids when compared to those without MDD (P = .048 and P = .038, respectively).

CONCLUSION

Patients with MDD undergoing total joint arthroplasty consume more opioids compared to their matched cohort during the immediate postoperative period. Identifying patient-specific factors, such as MDD, could help arthroplasty surgeons modulate patients' course of recovery. These findings warrant more cooperation between arthroplasty surgeons and primary care providers to optimize outcome.

Impact of Neuromuscular Electrical Stimulation (NMES) on 90-Day Episode Costs and Post-Acute Care Utilization in Total Knee Replacement Patients with Disuse Atrophy

INTRODUCTION

This study evaluated differences in: 1) total episode payments, 2) probability of hospital readmission, 3) probability of inpatient rehab facility (IRF) and utilization, and 4) probability of skilled nursing care facility (SNF) utilization in patients who had disuse atrophy and underwent a total knee arthroplasty (TKA) and either did, or did not, receive preoperative home-based neuromuscular electrical stimulation (NMES) therapy.

MATERIALS AND METHODS

We used the Medicare limited dataset for a 5% sample of beneficiaries from 2014 and 2015 to construct episodes-of-care for TKA (DRG-470) patients with disuse atrophy who underwent a TKA during the 30 days prior to hospital admission and 90 days post-discharge. Patients were stratified into those who either did or did not receive pre- and postoperative NMES therapy. An ordinary least square (OLS) model was used to estimate the impact of NMES on total episode. Linear probability models were used to estimate the impact of NMES on SNF or IRF utilization and readmission.

RESULTS

A $3,274 reduction in episode payments for patients who used preoperative NMES versus those who did not (p<0.001) was demonstrated. The probability of readmission was 12.7% lower for those who used preoperative NMES therapy versus those who did not (p=0.609). The probability of utilizing IRF and SNF was 56.7% (p=0.061) and 46.4% (p=<0.001) lower for those who used pre- and postoperative NMES versus those who did not, respectively.

CONCLUSION

Significant reduction in total episode payments and SNF utilization for TKA patients with disuse atrophy who had NMES therapy was demonstrated.

Acute Kidney Injury after Total Knee Arthroplasty: A Clinical Review

INTRODUCTION

Patients who develop acute kidney injury (AKI) have an increased risk for progression to chronic kidney disease, end-stage renal disease, and increased mortality. The outcomes of total knee arthroplasty (TKA) patients who develop AKI have remained controversial. The purpose of this review was to summarize and identify the current literature focused on 1) major risk factors, 2) short-term outcomes, and 3) costs associated with the development of perioperative AKI after TKA.

MATERIALS AND METHODS

A literature search was performed using PubMed and Ovid to find literature relevant to AKI in TKA. All abstracts found via literature search were screened for relevancy to the study topics: (1) risk factors, (2) short-term outcomes, and (3) cost.

RESULTS

A total of 447 abstracts were initially identified. Irrelevant abstracts and those not in English were excluded from the study (n=336). Forty-five papers focused on risk factors associated with AKI, six papers focused on short-term outcomes, and seven discussed cost savings. Increased body mass index, metabolic syndrome, perioperative antibiotics, antihypertensive medications, and antibiotic-impregnated cement spacers are amongst the many modifiable patient and drug-induced risk factors associated with AKI after TKA. Perioperative renal injury is associated with increased inpatient and long-term mortality with increased length of stay and extended care facility discharge.

CONCLUSION

Increased length of stay and comorbidities have shown higher cost utilization and readmission rates. Inpatient and long-term complications and mortality are associated with postoperative AKI and a multidisciplinary perioperative approach is necessary to appropriately identify and, ultimately, prevent patients at higher risk for acute renal failure.

Presentation of Knee Osteoarthritis in the Emergency Department: A Problem Worth Mentioning?

INTRODUCTION

Osteoarthritis (OA) of the knee is a progressive debilitating disease affecting more than 27 million Americans. Treatment is often aimed at reducing pain and slowing disease progression. However, patients with significant barriers to healthcare may elect to visit the emergency department (ED) due to OA-related knee pain. The purpose of this study is to provide a detailed analysis of 1) patient demographics; 2) payor type; 3) charges; and 4) discharge status of patients presenting to the emergency department with a primary diagnosis of knee OA.

MATERIALS AND METHODS

The Nationwide Emergency Department Sample from 2009 to 2013 was queried for all patients who presented to the ED with a primary diagnosis of knee OA (ICD-9 CM=715.96) and did not have a concomitant major injury. This yielded 215,253 patients. An analysis of variance (ANOVA) test with a post-hoc Turkey-Kramer test was conducted to assess mean differences of continuous data over time. All categorical data was analyzed using chi-square analysis.

RESULTS

The incidence of ED visits dropped significantly between the years 2009 and 2010 (68,661 to 36,846) and plateaued between the years 2010 and 2013. Patients had a mean age of 59.9 years and were primarily women (67.3%). The majority of patients were at the lowest 50% income bracket (68.8%). The Southern US census region had the highest number of ED visits (n=91,995; 42.7%), and Medicare was the primary payor in most cases (n=87,323; 40.7%). The mean charge for ED visits from 2009 to 2013 was $1,368.39, and there was a statistically significant increase in ED-related charges between 2009 and 2013 (p<0.001). The majority of discharges from the ED were routine (n=202,247; 93.8%).

CONCLUSION

While the early management of knee osteoarthritis is largely successful at delaying the need for surgery, there are still many patients who do not receive adequate care and present to the emergency room for non-emergent evaluation. This, along with rising charges for ED visits, is likely increasing resource consumption and the financial impact on the healthcare system. Future efforts should focus on improving access to care for patients with knee OA before it develops into an overwhelming burden.

The Addition of Diclofenac to a Multimodal Pain Control Regimen Decreases Postoperative Pain and Opioid Consumption

INTRODUCTION

Total knee arthroplasty (TKA) is a commonly-performed orthopaedic procedure in the United States. However, inadequate postoperative pain management following TKA has been associated with a number of negative consequences, including chronic postoperative pain requiring long-term opioid use. Multimodal pain control is a recently-popularized means of maximizing analgesia and postoperative outcomes. We aimed to evaluate the outcomes of a multimodal pain regimen incorporating diclofenac, including: 1) length of stay (LOS); 2) pain intensity; and 3) opioid consumption in primary TKA patients.

MATERIALS AND METHODS

A prospective cohort study was performed. All patients scheduled for primary TKA by a single surgeon between March 1, 2017 and August 31, 2017 were screened for study involvement, yielding 46 consecutive patients (52 TKAs). This study group was treated with a postoperative regimen of intravenous (IV) diclofenac, in addition to a perioperative pain control regimen including adductor canal blockade (ACB) and periarticular multimodal drug injection (PMDI). Postoperative outcomes in this group were compared to those of a matched cohort of 78 patients (88 primary TKAs) who had previously been treated with the same perioperative pain control regimen.

RESULTS

Patients prescribed a postoperative diclofenac regimen had lower mean LOS (2.10 vs. 2.33 days; p=0.053) and lower 24-hour postoperative pain intensity (76 vs. 104; p=0.056) as compared to the untreated group. The diclofenac-treated group had a significantly lower opioid consumption in the first 24 hours postoperatively than did their untreated counterparts (39.8 vs. 53.1 morphine milligram equivalents [MME]; p=0.041). In addition, 17 patients (18 TKAs, 35%) in the diclofenac group had zero opioid requirements during the first 12 hours postoperatively, and 12 of these patients (13 TKAs, 25%) continued to not require any opioids through the first 24 hours postoperatively.

DISCUSSION

In the midst of the rapidly-increasing rates of TKA in the US, multimodal pain control has emerged as an extremely effective means of maximizing postoperative patient outcomes. To our knowledge, this is the first study to evaluate the postoperative outcomes of TKA patients treated with a regimen of IV diclofenac. We demonstrate shorter LOS, decreased 24-hour pain intensity, and significantly decreased 24-hour opioid consumption in patients treated with adjunctive IV diclofenac compared to patients managed with our institution's standard perioperative regimen.

The Effect of Preoperative Physical Status on Pain Management in Total Knee Arthroplasty Patients Receiving Adductor Canal Blockade

INTRODUCTION

Managing postoperative pain can be challenging for arthroplasty surgeons. While pain control modalities, such as adductor canal blockade (ACB), have been proven effective, the multifactorial nature of pain perception may serve as an obstacle for optimizing pain control. This study assesses the effect of patient pre-operative physical status on patient perception of pain. Specifically, we compared 1) lengths of hospital stay (LOS), 2) pain levels, and 3) opioid consumption in patients receiving total knee arthroplasty (TKA) who presented with an American Society of Anesthesiologists physical status score (ASA) of 2 and 3.

MATERIALS AND METHODS

A single hospital, single surgeon database was reviewed for patients who had TKA between January 2015 and April 2016. Only patients with an ASA class of 2 or 3 who received ACB were analyzed. This yielded 106 patients with a mean age of 63 years, comprised of 36 men and 70 women. Patients were stratified into those with an ASA class of 2 (n= 58) and those with an ASA class of 3 (n= 48). Electronic medical records were reviewed to obtain demographic and endpoint data. Pain was quantified using Visual Analog Scale (VAS). Continuous variables were compared using the student' s t-test and analysis of variance, while categorical variables were compared using chi-square analysis.

RESULTS

There was no significant difference found between the two groups in LOS (2.25 days vs. 2.19 days; p=0.805), VAS scores (4.95 vs. 5.75; p=0.306), and opioid consumption on day 0 (17.77 morphine eq vs. 23.49 morphine eq; p=0.233) and day 3 (9.11 morphine eq vs. 19.87 morphine eq; p=0.100). However, patients with an ASA score of 2 had a significantly lower opioid consumption on day 1 (32.20 morphine eq vs. 52.70 morphine eq; p=0.049), day 2 (19.21 morphine eq vs. 40.71 morphine eq; p=0.018), and overall (78.30 morphine eq vs. 135.77 morphine eq; p=0.024).

CONCLUSION

Despite the effectiveness of ACB in controlling pain, patient pre-operative status may affect perception of pain. This study demonstrates that patients with a higher ASA physical status classification consumed more opioid medication postoperatively, despite having similar pain scores and lengths of stay to those with a lower classification. Future studies should assess all ASA classifications and stratify for preoperative opioid consumption and tolerance as a possible confounder.