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Özbaş N, Acar A, Karadağ M. The Effect of QR Code-Supported Patient Training on Total Knee Arthroplasty-Related Problems and Emergency Department Admission Rate. Comput Inform Nurs 2024; 42:305-312. [PMID: 38478918 DOI: 10.1097/cin.0000000000001113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
Knee arthroplasty surgery, which is increasingly performed due to increased life expectancy, has positive outcomes, although it can also cause serious health problems following surgery. This study was conducted to evaluate the impact of patient-related education via a QR code on total knee arthroplasty problems and emergency department referral rates. Participants were randomly assigned to intervention (n = 51) and control (n = 51) groups. The intervention group received QR code-supported training. The outcomes were assessed at baseline (preoperative), discharge, and postoperative sixth week. In the intervention group, significantly fewer problems related to total knee arthroplasty occurred at discharge and in week 6, and a higher level of functionality was noted ( P < .05). In week 6, the rate of emergency department admissions was lower, and mean scores for satisfaction with patient training were higher in the intervention group ( P < .05). In conclusion, QR code-supported patient training was effective in reducing the physiological and psychosocial problems related to total knee arthroplasty and the emergency department referral rates. In addition, it provided functional improvement and increased satisfaction with patient training.
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Affiliation(s)
- Nilgün Özbaş
- Author Affiliations: Nursing Department, Yozgat Bozok University Akdağmadeni Health College, Yozgat (Dr Özbaş); and Department of Orthopedics and Traumatology, University of Health Sciences Dişkapi Yildirim Beyazit Training and Research Hospital (Dr Acar); and Department of Nursing, Faculty of Health Sciences, Yüksek İhtisas University (Dr Karadağ), Ankara, Turkey
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Lethbridge L, Richardson CG, Dunbar MJ. Continuity of primary care and emergency department visits following knee and hip replacement surgery: a retrospective cohort study. Can J Surg 2023; 66:E451-E457. [PMID: 37673437 PMCID: PMC10495165 DOI: 10.1503/cjs.016622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/15/2023] [Indexed: 09/08/2023] Open
Abstract
BACKGROUND Continuity of primary care (CPC) improves patient well-being, but the association between CPC and surgical outcomes has not been well studied. The numbers of joint replacement procedures are expected to rise considerably in the coming years, so it is crucial to identify factors related to successful outcomes. The purpose of this study was to examine the association between CPC and emergency department (ED) visits after knee and hip replacement surgery. METHODS Physician claims and hospital data from 2005 to 2020 in Nova Scotia were used in this retrospective study. To measure CPC, we used the Modified Modified Continuity Index (MMCI), which is the number of primary care providers adjusted for the total number of visits. The outcome was ED visits within 90 days of discharge. Logistic regression was used to test for associations between MMCI and the probability of an ED visit. RESULTS There were 28 574 knee and 16 767 hip procedures in the data set; 13.9% (95% confidence interval [CI] 13.5%-14.3%) and 13.5% (95% CI 13.0%-14.0%) of the patients, respectively, had an ED visit within 90 days. For patients who underwent knee procedures, the mean MMCI was 0.868 (95% CI 0.867-0.870); 10.7% (95% CI 10.4 %-11.1 %) had perfect continuity of care. For patients who underwent hip procedures, the corresponding measures were 0.864 (95% CI 0.862-0.866) and 13.5% (95% CI 13.0%-14.0%). There was a statistically significant negative association between greater continuity of care and the probability of an ED visit after controlling for confounders. CONCLUSION Having multiple primary care providers before surgery increased the likelihood of negative outcomes following knee or hip replacement surgery compared with having a single provider. Presurgical conversations should include primary care history to improve postsurgical outcomes.
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Affiliation(s)
- Lynn Lethbridge
- From the Department of Surgery, Dalhousie University, Halifax, NS (Lethbridge, Richardson, Dunbar); and the Nova Scotia Health Authority, Halifax, NS (Richardson, Dunbar)
| | - C Glen Richardson
- From the Department of Surgery, Dalhousie University, Halifax, NS (Lethbridge, Richardson, Dunbar); and the Nova Scotia Health Authority, Halifax, NS (Richardson, Dunbar)
| | - Michael J Dunbar
- From the Department of Surgery, Dalhousie University, Halifax, NS (Lethbridge, Richardson, Dunbar); and the Nova Scotia Health Authority, Halifax, NS (Richardson, Dunbar)
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Hecht CJ, Burkhart RJ, Karimi AH, Acuña AJ, Kamath AF. What is the Association Between Clinically Diagnosed Psychiatric Illness and Total Joint Arthroplasty? A Systematic Review Evaluating Outcomes, Healthcare Use, and Patient-reported Outcome Measures. Clin Orthop Relat Res 2023; 481:947-964. [PMID: 36730492 PMCID: PMC10097587 DOI: 10.1097/corr.0000000000002481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 10/12/2022] [Indexed: 02/04/2023]
Abstract
BACKGROUND Studies evaluating the effects of a psychiatric illness on orthopaedic surgical outcomes have yielded mixed results. Because awareness of patient comorbid mental health disorders has become increasingly important to tailor treatment plans, the aim of our systematic review was to present the findings of all studies reporting on the association between clinically diagnosed psychiatric illnesses and total joint arthroplasty (TJA) outcomes and evaluate the quality of evidence to provide a comprehensive summary. QUESTION/PURPOSE Is there a consistently reported association between comorbid psychiatric illness and (1) complication risk, (2) readmission rates, (3) healthcare use and discharge disposition, and (4) patient-reported outcome measures (PROMs) after TJA? METHODS The PubMed, EBSCO host, Medline, and Google Scholar electronic databases were searched on April 9, 2022, to identify all studies that evaluated outcomes after TJA in patients with a comorbid clinically diagnosed mental health disorder between January 1, 2000, and April 1, 2022. Studies were included if the full-text article was available in English, reported on primary TJA outcomes in patients with clinically diagnosed mental health disorders, included patients undergoing TJA without a psychiatric illness for comparison, and had a minimum follow-up time of 30 days for evaluating readmission rates, 90 days for other perioperative outcomes such as length of stay and complications, and 1-year minimum follow-up if assessing PROMs. Studies that used a mental health screening examination instead of clinical diagnoses were excluded to isolate for verified psychiatric illnesses. Additionally, systematic reviews, case reports, duplicate studies between the databases, and gray literature were excluded. Twenty-one studies were included in our final analysis comprising 31,023,713 patients with a mean age range of 57 to 69 years. Mental health diagnoses included depression, anxiety, bipolar disorder, schizophrenia, major personality disorder, and psychosis as well as concomitant mental disorders. Two reviewers independently evaluated the quality of included studies using the Methodological Index for Nonrandomized Studies (MINORS) tool. The mean MINORS score was 19.5 ± 0.91 of 24, with higher scores representing better study quality. All the articles included were retrospective, comparative studies. Given the heterogeneity of the included studies, a meta-analysis was not performed, and results are instead presented descriptively. RESULTS Patients with schizophrenia were consistently reported to have higher odds of medical and surgical complications than patients without psychiatric illness, particularly anemia and respiratory complications. Among studies with the largest sample sizes, patients with depression alone or depression and anxiety had slightly higher odds of complications. Most studies identified higher odds of readmission among patients with depression, schizophrenia, and severe mental illness after TJA. However, for anxiety, there was no difference in readmission rates compared with patients without psychiatric illness. Slightly higher odds of emergency department visits were reported for patients with depression, anxiety, concomitant depression and anxiety, and severe mental illness across studies. When evaluating healthcare use, articles with the largest sample sizes reporting on depression and length of stay or discharge disposition found modestly longer length of stay and greater odds of nonhome discharge among patients with depression. Although several studies reported anxiety was associated with slightly increased total costs of hospitalization, the most robust studies reported no difference or slightly shorter average length of stay. However, the included studies only reported partial economic analyses of cost, leading to relatively superficial evidence. Patients with schizophrenia had a slightly longer length of stay and modestly lower odds of home discharge and cost. Likewise, patients with concomitant depression and anxiety had a slightly longer average length of stay, according to the two articles reporting on more than 1000 patients. Lastly, PROM scores were worse in patients with depression at a minimum follow-up of 1 year after TJA. For anxiety, there was no difference in improvement compared with patients without mental illness. CONCLUSION Our systematic review found that individuals with psychiatric illness had an increased risk of postoperative complications, increased length of stay, higher costs, less frequent home discharge, and worse PROM scores after TJA. These findings encourage inclusion of comorbid psychiatric illness when risk-stratifying patients. Attention should focus on perioperative interventions to minimize the risk of thromboembolic events, anemia, bleeding, and respiratory complications as well as adequate pain management with drugs that do not exacerbate the likelihood of these adverse events to minimize emergency department visits and readmissions. Future studies are needed to compare patients with concomitant psychiatric illnesses such as depression and anxiety with patients with either diagnosis in isolation, instead of only comparing patients with concomitant diagnoses with patients without any psychiatric illnesses. Similarly, the results of targeted interventions such as cognitive behavioral therapy are needed to understand how orthopaedic surgeons might improve the quality of care for patients with a comorbid psychiatric illness.
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Affiliation(s)
- Christian J. Hecht
- Department of Orthopaedic Surgery, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Robert J. Burkhart
- Department of Orthopaedic Surgery, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Amir H. Karimi
- Department of Orthopaedic Surgery, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Alexander J. Acuña
- Department of Orthopaedic Surgery, Cleveland Clinic Foundation, Cleveland, OH, USA
| | - Atul F. Kamath
- Department of Orthopaedic Surgery, Cleveland Clinic Foundation, Cleveland, OH, USA
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Singh V, Anil U, Kurapatti M, Robin JX, Schwarzkopf R, Rozell JC. Emergency department visits following total joint arthroplasty: do revisions present a higher burden? Bone Jt Open 2022; 3:543-548. [PMID: 35801582 PMCID: PMC9350702 DOI: 10.1302/2633-1462.37.bjo-2022-0026.r1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Aims Although readmission has historically been of primary interest, emergency department (ED) visits are increasingly a point of focus and can serve as a potentially unnecessary gateway to readmission. This study aims to analyze the difference between primary and revision total joint arthroplasty (TJA) cases in terms of the rate and reasons associated with 90-day ED visits. Methods We retrospectively reviewed all patients who underwent TJA from 2011 to 2021 at a single, large, tertiary urban institution. Patients were separated into two cohorts based on whether they underwent primary or revision TJA (rTJA). Outcomes of interest included ED visit within 90-days of surgery, as well as reasons for ED visit and readmission rate. Multivariable logistic regressions were performed to compare the two groups while accounting for all statistically significant demographic variables. Results Overall, 28,033 patients were included, of whom 24,930 (89%) underwent primary and 3,103 (11%) underwent rTJA. The overall rate of 90-day ED visits was significantly lower for patients who underwent primary TJA in comparison to those who underwent rTJA (3.9% vs 7.0%; p < 0.001). Among those who presented to the ED, the readmission rate was statistically lower for patients who underwent primary TJA compared to rTJA (23.5% vs 32.1%; p < 0.001). Conclusion ED visits present a significant burden to the healthcare system. Patients who undergo rTJA are more likely to present to the ED within 90 days following surgery compared to primary TJA patients. However, among patients in both cohorts who visited the ED, three-quarters did not require readmission. Future efforts should aim to develop cost-effective and patient-centred interventions that can aid in reducing preventable ED visits following TJA. Cite this article: Bone Jt Open 2022;3(7):543–548.
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Affiliation(s)
- Vivek Singh
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Utkarsh Anil
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Mark Kurapatti
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Joseph X. Robin
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Ran Schwarzkopf
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
| | - Joshua C. Rozell
- Department of Orthopedic Surgery, NYU Langone Health, New York, New York, USA
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Singh V, Kurapatti M, Anil U, Macaulay W, Schwarzkopf R, Davidovitch RI. Evaluation of Emergency Department Visits Following Total Joint Arthroplasty: Same-Day Discharge vs Non-Same-Day Discharge. J Arthroplasty 2022; 37:1017-1022. [PMID: 35181447 DOI: 10.1016/j.arth.2022.02.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/05/2022] [Accepted: 02/09/2022] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Traditionally, most efforts have focused on readmission rates while little has been reported on emergency department (ED) presentation. This study aims to analyze the difference between same-day discharge (SDD) and non-SDD primary total hip and knee arthroplasty cases to determine the rate and reasons associated with 90-day ED presentations. METHODS We retrospectively reviewed all patients who underwent primary total hip arthroplasty and total knee arthroplasty between 2011 and 2021. The patients were separated into 2 cohorts: (1) SDD and (2) required a longer length of stay. The primary outcome was an ED visit within 90 days of the index operation. Secondary outcomes included reasons for ED visits and readmission rates. Multivariable logistic regressions were performed to compare the 2 groups while accounting for significant demographic variables. RESULTS Of the 24,933 patients included, 1,725 (7%) were SDD and 23,208 (93%) required a longer length of stay. The overall rate of 90-day ED visits was significantly lower for patients who were SDD compared to non-SDD (1.6% vs 4.0%, P = .004). However, when stratified based on the reason for ED visit, no single cause was significant between the 2 cohorts. The most commonly reported reasons were pain (32.1% vs 26.7%, P = .064) and other non-orthopedic-related medical issues (25.0% vs 29.5%, P = .206). Among those who presented to the ED, the readmission rate did not statistically differ (25.0% vs 23.4%, P = .131). CONCLUSION Patients who underwent SDD were less likely to present to the ED within 90 days following their surgery compared to non-SDD. Approximately three fourths of the patients in both cohorts that visited the ED did not require readmission. Future efforts should focus on developing interventions to reduce the burden of these visits on the healthcare system. LEVEL III EVIDENCE Retrospective Cohort Study.
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Affiliation(s)
- Vivek Singh
- Department of Orthopedic Surgery, NYU Langone Health, New York, NY
| | - Mark Kurapatti
- Department of Orthopedic Surgery, NYU Langone Health, New York, NY
| | - Utkarsh Anil
- Department of Orthopedic Surgery, NYU Langone Health, New York, NY
| | - William Macaulay
- Department of Orthopedic Surgery, NYU Langone Health, New York, NY
| | - Ran Schwarzkopf
- Department of Orthopedic Surgery, NYU Langone Health, New York, NY
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Ravi B, Pincus D, Croxford R, Leroux T, Paterson JM, Hawker G, Redelmeier DA. Patterns of pre-operative opioid use affect the risk for complications after total joint replacement. Sci Rep 2021; 11:22124. [PMID: 34764305 PMCID: PMC8586234 DOI: 10.1038/s41598-021-01179-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 10/14/2021] [Indexed: 12/14/2022] Open
Abstract
Preoperative opioid use has been shown to increase the risk for complications following total joint arthroplasty (TJA); however, these studies have not always accounted for differences in co-morbidities and socio-demographics between patients that use opioids and those that do not. They have also not accounted for the variation in degree of pre-operative use. The objective of this study was to determine if preoperative opioid use is associated with risk for surgical complications after TJA, and if this association varied by degree of use. Population-based retrospective cohort study. Older adult patients undergoing primary TJA of the hip, knee and shoulder for osteoarthritis between 2002 and 2015 in Ontario, Canada were identified. Using accepted definitions, patients were stratified into three groups according to their preoperative opioid use: no use, intermittent use and chronic use. The primary outcome was the occurrence of a composite surgical complication (surgical site infection, dislocation, revision arthroplasty) or death within a year of surgery. Intermittent and chronic users were matched separately to non-users in a 1:1 ratio, matching on TJA type plus a propensity score incorporating patient and provider factors. Overall, 108,067 patients were included in the study; 10% (N = 10,441) used opioids on a chronic basis before surgery and 35% (N = 37,668) used them intermittently. After matching, chronic pre-operative opioid use was associated with an increased risk for complications after TJA (HR 1.44, p = 0.001) relative to non-users. Overall, less than half of patients undergoing TJA used opioids in the year preceding surgery; the majority used them only intermittently. While chronic pre-operative opioid use is associated with an increased risk for complications after TJA, intermitted pre-operative use is not.
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Affiliation(s)
- Bheeshma Ravi
- Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, Canada. .,Division of Orthopaedic Surgery, Sunnybrook Health Sciences Centre, 43 Wellesley St E, Room 315, Toronto, ON, M4Y 1H1, Canada.
| | - Daniel Pincus
- Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.,Division of Orthopaedic Surgery, Sunnybrook Health Sciences Centre, 43 Wellesley St E, Room 315, Toronto, ON, M4Y 1H1, Canada
| | | | - Timothy Leroux
- Division of Orthopaedic Surgery, Department of Surgery, University of Toronto, Toronto, Canada.,Division of Orthopaedic Surgery, Toronto Western Hospital, Toronto, Canada
| | | | - Gillian Hawker
- Department of Medicine, University of Toronto, Toronto, Canada
| | - Donald A Redelmeier
- ICES, Toronto, Canada.,Department of Medicine, University of Toronto, Toronto, Canada
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Knapp P, Layson JT, Mohammad W, Pizzimenti N, Markel DC. The Effects of Depression and Anxiety on 90-day Readmission Rates After Total Hip and Knee Arthroplasty. Arthroplast Today 2021; 10:175-179. [PMID: 34458530 PMCID: PMC8379358 DOI: 10.1016/j.artd.2021.06.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 06/05/2021] [Accepted: 06/16/2021] [Indexed: 11/28/2022] Open
Abstract
Background Patients undergoing total joint arthroplasty have higher rates of anxiety, depression or anxiety and depression than the general population and higher costs of care, which lead to higher levels of postoperative dissatisfaction and readmission rates. We evaluated the readmission rates of patients undergoing total hip or knee arthroplasty with diagnoses of anxiety, depression, or both. Methods Our hospital's prospectively collected data from Michigan's statewide total joint database were reviewed from 2013 to 2018. Rates of anxiety, depression or anxiety and depression were determined based on preoperative anxiolytic or antidepressant medications using National Drug Codes. Results A total of 4107 cases were included. Of which 4.28% had a readmission within the 90-day global period, and 12% had a history of depression or anxiety or both. For the entire cohort, those on anxiolytic medication were 153% more likely to be readmitted than those not on medication (P = .017). When comparing total hip arthroplasty (THA) or total knee arthroplasty (TKA), patients taking anxiolytic medication and undergoing TKA were 120% more likely to undergo readmission within 90 days (P = .021). Patients on depression medication alone were not at increased risk of readmission in the TKA cohort (P = .991). For THA, neither diagnosis appeared a risk factor for readmission (P = .852). Conclusions Patients with depression, anxiety, or both undergoing TKA were at a statistically significant risk of readmission within 90 days compared with patients without these diagnoses. Anxiety and depression were both risk factors for readmission, but anxiety appeared to have a more significant impact. Patients undergoing THA on the other hand did not appear to share this risk profile.
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Affiliation(s)
- Paul Knapp
- Section of Orthopaedic Surgery, Ascension Providence Hospital, Southfield, MI, USA
| | - James T Layson
- Section of Orthopaedic Surgery, Ascension Providence Hospital, Southfield, MI, USA
| | - Waleed Mohammad
- Section of Orthopaedic Surgery, Ascension Providence Hospital, Southfield, MI, USA
| | - Natalie Pizzimenti
- Ascension-Providence Orthopaedic Residency, The MORE Foundation, Novi, MI, USA
| | - David C Markel
- Section of Orthopaedic Surgery, Ascension Providence Hospital and The Core Institute, Novi, MI, USA
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Maldonado-Rodriguez N, Gandhi R, Sundararajan K, Rampersaud YR, Mahomed N, Leroux TS. What Goes Bump in the Night: An Evaluation of Emergency Department Visits Following Total Joint Arthroplasty. J Arthroplasty 2021; 36:1232-1238. [PMID: 33298326 DOI: 10.1016/j.arth.2020.10.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 10/17/2020] [Accepted: 10/26/2020] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Interest in postoperative healthcare utilization has increased following the implementation of episode-of-care funding for elective orthopedic surgery. Most efforts have focused on readmission; however, little has been reported on emergency department (ED) presentation. We analyzed elective, primary total hip or knee arthroplasty (THA and TKA) cases to determine the rate, reasons, risk factors, timing, and hospital cost associated with 30-day ED presentations. METHODS An observational study of patients who underwent primary, elective TKA and THA between January 1, 2016, and December 31, 2017, was performed. The primary outcome was an ED visit within 30-days of the index operation. Secondary outcomes included reasons, risk factors, timing, and hospital cost of ED visits. A multivariable logistic regression was undertaken to determine patient factors associated with ED presentation. RESULTS Overall, 1690 patients were included, of which 9.2% presented to the ED within 30-days of surgery. Approximately two-thirds of the visits were after-hours, and most were discharged home without readmission (81.4%). The most commonly reported reasons were wound concerns (30.1%) and pain (20.5%). Older age (OR 1.1, P = .03) and preoperative dyspnea (OR 2.1, P < .001) increased the odds of ED visits. The mean cost of an ED visit was significantly greater after-hours (P = .015). CONCLUSION Overall, 1 in 10 patients undergoing TKA/THA presented to the ED within 30-days of surgery, of which over 80% were not readmitted, and most occurred after-hours where cost is greatest. Our observations suggest ED visits following TKA/THA are common, and most are likely preventable. Future efforts should focus on developing interventions to reduce these visits.
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Affiliation(s)
- Naomi Maldonado-Rodriguez
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Rajiv Gandhi
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Kala Sundararajan
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Y Raja Rampersaud
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Nizar Mahomed
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
| | - Timothy S Leroux
- Division of Orthopaedic Surgery, Department of Surgery, University Health Network, Toronto, Ontario, Canada
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