Coronavirus disease 2019 (COVID-19) has rapidly evolved as a viral pandemic. Countries worldwide been affected by the recent outbreak caused by the SARS (severe acute respiratory syndrome)-CoV-2 virus1. High-density population centers with high mobility patterns, such as the New York metropolitan region, appear to be strongholds of COVID-19 with frequent spread from person to person2.
Hospitals and health-care systems are developing into zones of high transmission for COVID-19. As with prior viral pandemics (e.g., influenza A/H1N1, Middle East Respiratory Syndrome [MERS], SARS) health-care workers are at increased risk of contracting COVID-19, which can subsequently reduce staffing and resources for patient care3. The COVID-19 pandemic is different from prior situations because many infected people may be actively shedding virus but are clinically asymptomatic4,5.
Orthopaedic surgical procedures are a mainstay for modern health-care systems, ranging from emergency to elective procedures for chronic conditions. Continuing routine surgical care during this pandemic would place patients and health-care workers of all levels at increased risk for contracting COVID-19 and would consume limited supplies of personal protective equipment (PPE). However, many orthopaedic surgical procedures are life or limb-saving and cannot be postponed in spite of those risks6,7. The purpose of this report is to discuss safe orthopaedic surgery practices during the pandemic and the need to consider alternative strategies for patient care when suboptimal conditions arise. We created a classification system to help guide perioperative decision-making for patients needing medically necessary surgery during the pandemic.
SARS-CoV-2 Virus
COVID-19 is caused by a novel coronavirus (SARS-CoV-2), which was identified for the first time in December 2019 in Wuhan, China8,9. This virus has rapidly spread to >200 countries and territories1. A characteristic trait of COVID-19 is the relatively long incubation period (the median is 5.1 days, and it usually presents with symptoms within 12 days after infection)10. A large percentage of infected patients are asymptomatic or have minimal symptoms and increase viral transmission within a population, silently spreading COVID-19 further4,5.
COVID-19 initially was thought to preferentially affect patients >65 years of age with a high rate of morbidity and mortality11. However, younger adults also can be affected with serious illness12,13. In New York City (NYC), many younger patients have been affected, and reports of deaths among people <50 years of age, including health-care workers, have been alarming14. Further research is needed to understand how age and comorbid conditions affect morbidity and mortality from COVID-19.
Mandates released by health departments and the government have been issued with “stay at home orders,” quarantine measures for infected individuals, closure of nonessential businesses, and travel restrictions to reduce the transmission of COVID-19 and to decrease the national public health burden15,16. While these measures do not prohibit medically necessary office visits, these measures should be supported to limit virus spread. These measures may affect all aspects of ancillary musculoskeletal services, which will greatly affect orthopaedic patient care.
Patient Screening
Current screening recommendations are based on the latest Centers for Disease Control and Prevention (CDC) and World Health Organization (WHO) guidelines and are subject to change because of the rapidly evolving disease17–19. Because of data regarding asymptomatic spread, screening recommendations are different in regions with a high incidence of infection, such as NYC, compared with regions with low infection rates4.5. All patients undergoing medically necessary orthopaedic surgery procedures should be asked about their personal history over the past 14 days with regard to symptoms such as fever, cough, shortness of breath, respiratory disturbances, pneumonia of uncertain cause, and contact with a person positive for COVID-1920. In areas with a noted community spread of COVID-19, patients have an increased risk of being asymptomatic carriers4,5,14. Travel history is no longer a contributing factor given the widespread nature of COVID-19. Another feature of COVID-19 is the loss of smell and taste early in the disease process21. Symptom severity varies widely, with many people who are asymptomatic or are mildly symptomatic people and appear to have a mild cold20–24.
Testing for COVID-19 in Low-Prevalence Regions
For high-risk patients needing urgent surgery during the COVID-19 pandemic, we recommend routine screening with a rapid polymerase chain reaction (PCR) test, if available, as close to surgery as possible. Given the limited availability of tests, protocols are evolving for routine PCR testing prior to surgery for patients who live in regions with low to moderate community prevalence. We define moderate and low prevalence of COVID-19 infection as 50 to 100 cases per 100,000 people and <50 cases per 100,000 people, respectively25,26. As tests become more available, we recommend routine testing of asymptomatic patients because of the risk of operating on asymptomatic carriers27,28.
Testing for COVID-19 in High-Prevalence Regions
High-prevalence regions are defined as having an infection rate of >100 cases per 100,000 people27,28. Currently, >100 per 100,000 people are infected with COVID-19 in the New York region and the prevalence of COVID-19 is so high that testing the entire population is not possible29. To maximize the safety of perioperative teams, we recommend treating every patient in a high-prevalence region as being at high risk for COVID-19. With the rapid spread of COVID-19 throughout the world, the highly transmissible nature of this respiratory virus, and the high incidence of asymptomatic carriers, the final recommendation may be that every patient should be treated as if they have COVID-19 once it is widespread in the community.
Safe Orthopaedic Surgery Practices During COVID-19 Pandemic
Patients, surgeons, and all surgical team members are at risk for COVID-19. Considering these risks and challenges facing the public health systems of the world, we have formulated the following recommendations.
Scheduling and Perioperative Team Management
All elective procedures should be rescheduled and delayed. For urgent, emergency, and time-sensitive procedures, standard practices regarding risk-stratification, antibiotic prophylaxis, and sterile practices should be continued. Close monitoring and daily screening of perioperative teams with temperature assessments twice a day is advised to identify early disease and avoid inadvertent viral transmission to patients and team members. We recommend using surgical teams separated physically; the teams should alternate weeks of work to avoid exposure of the entire staff. If one team has a member who tests positive, only the affected team should quarantine. The next available and healthy team would then take over care30. Symptomatic personnel not only should stay home but also should contact their primary care physician and Occupational Health Department.
Orthopaedic Surgery Patients Positive for COVID-19 and in Regions of High Infection Rates
Risks and benefits of orthopaedic surgery should be carefully evaluated for patients who are symptomatic with COVID-19. Because of the high morbidity and mortality from COVID-19, potential delays in surgery may be required, even for otherwise urgent procedures (e.g., a hip fracture in an elderly patient). When it is medically necessary to proceed with surgery, we recommend using an evidence-based approach. Surgery should be performed rarely on COVID-19-positive patients and only in situations in which the risks of surgery are outweighed by the benefits. This most likely would occur in emergency situations (e.g., high-grade open fracture, necrotizing infection, compartment syndrome) or when surgical delay could cause increased morbidity and possibly mortality (e.g., displaced femoral neck fracture, periprosthetic joint infection, perilunate fracture-dislocation).
Analyses of SARS-CoV-1 and MERS viral outbreaks have demonstrated that virus particles are identifiable in the blood31. Previous studies have demonstrated that human immunodeficiency virus (HIV) particles are detectable in air samples during surgery with use of power tools32, suggesting that viral aerosolization is possible during many orthopaedic procedures that involve blood loss and the use of power tools. Intraoperative viral transmission of human papillomavirus from patient to surgical teams from the smoke plume during treatment is controversial33,34. More research is needed to understand how electrocautery and high-speed tools affect the SARS-CoV-2 virus. We advocate for (1) care when using power tools; (2) minimizing use of electrocautery; (3) when needed, using electrocautery at the lowest setting; and (4) aggressive suctioning of surgical smoke to minimize the volume of airborne viral particles.
Positive-pressure ventilation systems combined with a surgical hood and gown, often referred to as a surgical “toga system,” are frequently used during orthopaedic surgeries and are useful for avoiding gross contamination during surgery. Industry data from the time of the initial SARS outbreak in 2003 suggested that surgical togas may offer benefit with regard to preventing the passage of small particles35. It is important to emphasize that the use of surgical togas as respirators has not been approved by the U.S. Food and Drug Administration. With or without toga use, the air environment is best controlled with a negative-pressure ventilation system, which is not available in all operating rooms. Therefore, proper PPE remains critical to the safety of perioperative teams.
PPE must be utilized before, during, and after surgery in order to reduce transmission17,18,36–44. Traffic entering or exiting the operating room should be limited, and all staff entering should be fully protected with PPE. Guidelines from the American College of Surgeons (ACS), CDC, and WHO are being adjusted regularly on the basis of research and may be changed in the future. We support the highest level of protection (including a powered air-purifying respirator [PAPR] or N95 respirator, a face shield or goggles, gloves, boot covers, and an isolation gown) when performing surgery for patients who have or are at risk of having COVID-1942–44. The CDC specifies that the N95 respirator is preferred to a surgical mask when treating positive patients3. The WHO guidelines also advocate for N95 respirators or PAPR devices during procedures with a risk of aerosolization of viral particles43. Emerging data from Wuhan, People’s Republic of China support orthopaedic surgeon use of N95 respirators when treating COVID-19-positive patients on the ward, in the operating room, and in public hospital locations; not wearing an N95 respirator was found to significantly increase the risk of contracting COVID-19 (odds ratio, 5.2 [95% confidence interval, 1.09 to 25.00])45. Importantly, that study also showed a 25% rate of subsequent transmission from the surgeon to others, including family members, colleagues, friends, and patients45. Another study from the People’s Republic of China demonstrated decreased infection and mortality rates when an N95 respirator group was compared with a surgical mask group of health-care workers46. We advocate for the use of an N95 respirator or PAPR with use of face shields, isolation gowns, boot covers, and gloves for all members during surgery on COVID-19 patients, and these measures are also used for all patients in regions of high infectivity, such as NYC.
Strong communication with the anesthesiology team is vital during surgery on high-risk COVID-19 patients. Close monitoring of cardiopulmonary function perioperatively is necessary to avoid rapid patient deterioration. CDC guidelines support the use of N95 masks when intubating and extubating patients who are actively shedding viral particles3. New guidelines from the ACS recommend that intubation be performed outside of the operating room (e.g., in the intensive-care unit); the ACS also recommends use of a dedicated operating room for all COVID-19 patients47. We recommend that these procedures be performed with the least number of team members present because of the potential aerosolization of viral particles48,49. If the patient has not been previously intubated, regional or spinal anesthesia may be preferred in certain situations50. Preoperative chest imaging and close monitoring of oxygen saturation will guide anesthesia teams regarding ideal methods of anesthesia management.
Orthopaedic Surgery for Non-Infected or Asymptomatic Patients
Surgery should be reserved for emergency and urgent situations only, and the decision to proceed to the operating room should be guided by a number of factors. The community prevalence of COVID-19 should factor into guiding treatment in order to avoid straining already stressed health-care resources in regions of high prevalence. Health-care personnel involved with medically necessary surgical procedures should follow ACS and CDC guidelines regarding PPE17,18,21,22,33–44. Because of the risks of viral spread from asymptomatic patients, we recommend the use an N95 respirator or PAPR when performing surgery for an asymptomatic patient if there is a high prevalence of COVID-19 in the community, such as in NYC28,29. In regions of low prevalence with asymptomatic patients, a standard surgical mask is acceptable. Medically necessary outpatient procedures can be safely performed in a surgery center to decrease the burden of care and equipment on hospitals7.
When to Operate and Which PPE Is Preferred?
To summarize our recommendations based on the current literature, patients were divided into 4 categories. This classification system is similar to other guidelines42,51–53 but adds guidance regarding medically necessary surgical procedures as well as surgery management, such as the timing of surgery, preferred PPE, and ideal setting for surgery for each patient. Details regarding our classification system are shown in Table I.
TABLE I -
Classification System for Performance of Only Medically Necessary Surgical Procedures During COVID-19 Pandemic
*
| Classification |
Patient COVID-19 Positivity and Health Status |
Community COVID-19 Prevalence |
Risk of Surgery Given Patient Status and Community COVID-19 Prevalence |
Risk of Disease Transmission to Perioperative Team |
Treatment Options |
N95/PAPR or Surgical Mask |
Additional Recommendations |
| Class 4 |
COVID-19-positive, critical illness |
All levels |
Excessive |
Yes |
Surgery not advised unless patient improves adequately |
N95/PAPR |
If patient improves, surgery will be high risk (Class 3) |
| Class 3 |
COVID-19-positive, active disease |
All levels |
High |
Yes |
Delay if possible; proceed only if life or limb-threatening |
N95/PAPR |
Risks and benefits of surgery must be decided with a multidisciplinary approach specific to each patient |
| Class 2A |
COVID-19-positive, minimally symptomatic |
High |
Increased risk |
Yes |
Delay if possible; proceed if life or limb-threatening; temporize if appropriate |
N95/PAPR |
Close postoperative monitoring needed; disposition planning needed due to demand for hospital beds |
| Class 2B |
COVID-19-positive, minimally symptomatic |
Low or Moderate |
Increased risk |
Yes |
Delay if possible; proceed with surgery if resources allow |
N95/PAPR |
Close postoperative monitoring needed |
| Class 1A |
Asymptomatic |
High |
Low |
Possible |
Delay if possible; proceed if life or limb-threatening; temporize if appropriate |
N95/PAPR recommended due to community prevalence |
Rapid testing recommended when available to help guide PPE use; discharge as soon as possible, consider outpatient care when appropriate |
| Class 1B |
Asymptomatic |
Low or Moderate |
Low |
Unlikely |
Proceed with medically necessary surgery |
Surgical mask |
Use outpatient facilities when appropriate |
*We recommend nonoperative and alternative treatment when appropriate for orthopaedic conditions. In spite of the risks of postponement, delayed treatment should still be considered in certain situations that would otherwise not be acceptable (e.g., delayed surgical fixation of a hip fracture in a patient with active COVID-19). COVID-19 community prevalence is important to consider because of health-care resource limitations. The classification system stratifies patients on the basis of (1) COVID-19 positivity, (2) patient health status, (3) risk of surgery due to COVID-19, and (4) prevalence of COVID-19 in a given region. Analysis of these factors helps to guide PPE use, the safety of surgery, the setting of surgery, and the timing of medically necessary surgery.
Alternatives to Initial Hospital-Based Surgery
Standard management of common orthopaedic conditions may not be appropriate during the COVID-19 pandemic, necessitating consideration of alternative management options (see Appendix).
Recommended PPE Not Available: Alternatives to Recommended PPE
During this pandemic, there have been numerous reports of suboptimal PPE use due to lack of reserves, supply-chain limitations, and high global demand, but medically necessary surgery and health care must continue. In situations in which optimal PPE may not be available, alternative options to best protect perioperative teams are necessary (see Appendix).
Postoperative Care: Inpatient and Outpatient Follow-up
In order to minimize COVID-19 transmission following surgery, health-care workers must adhere to CDC guidelines for patient isolation and PPE18,36–44. After surgery, patients should be placed in isolation rooms with strict no-visitor policies.
While standard wound care and antibiotic prophylaxis are recommended, extended antibiotic therapy may be beneficial if an immunocompromised state or bacterial infection is identified. Perioperative multidisciplinary care (provided by orthopaedic surgery, internal medicine, pulmonology, infectious disease, cardiology, nursing, social work, nutrition, physical therapy, and sanitation personnel) will be needed for COVID-19-positive patients to reduce postoperative complications and mortality. Physical and occupational therapy are vital components of recovery after orthopaedic surgery and will need to be implemented as soon as safely possible. The length of stay (LOS) for both infected and non-infected patients during the COVID-19 pandemic may extend beyond the average LOS for a given procedure. Increased LOS may occur not only because of difficulties in arranging rehabilitation center or skilled-nursing center placement but also because of patient morbidities from the COVID-19 illness.
When appropriate, telemedicine can be utilized to allow for remote patient care, thereby reducing patient contact and decreasing demands on the limited supply of PPE54,55. New data suggest that traditional, office-based follow-up may not be needed for some orthopaedic conditions56. We recommend the use of technology to aid in frequent follow-up via telemedicine, video conferencing, and telephone calls to allow for strong patient-to-surgeon communication while limiting direct physician-patient contact and travel to the office54. Furthermore, the Centers for Medicare & Medicaid Services (CMS) supports these measures to aid in safe outpatient care55. Currently, many forms of communication are allowed by CMS and therefore are also being accepted by some private insurers. However, some forms of communication will not be considered HIPAA (Health Insurance Portability and Accountability Act)-compliant after the pandemic has resolved. We recommend developing a telemedicine approach now that is not only effective in communicating to patients with the use of audio and video but also will be HIPAA-compliant when CMS again requires the prior guidelines for patient privacy.
Summary
Because of the nature of the SARS-CoV-2 virus, the field of orthopaedic surgery must respond according to recommendations for the health of patients, surgeons, and the entire health-care team. Elective surgical procedures should be rescheduled, and inpatient procedures should be shifted to an outpatient setting if possible in order to reduce system-wide stressors on hospitals. We recommend adhering to the ACS guidelines for postponing elective procedures during the COVID-19 pandemic57. However, some modifications of these recommendations are likely as we gain greater national experience with management of the viral transmission and how it affects health-care resources.
Orthopaedic surgical procedures for patients infected with COVID-19 should be conducted on the basis of a systematic evaluation of each patient’s COVID-19 positivity, the patient’s health status, the community COVID-19 prevalence, and the nature of the patient’s pathology. Orthopaedic surgeons will need to be adaptable as COVID-19 may compel us to use alternative approaches compared with our typical practice with full resources. Tables II and III summarize our recommendations regarding orthopaedic surgery during the COVID-19 pandemic. Orthopaedic surgery should be performed for the properly indicated conditions during this pandemic, but careful perioperative planning is required to maximize the protection of patients, surgeons, and all perioperative team members.
TABLE II -
Recommendations for Medically Necessary Orthopaedic Procedures on Asymptomatic Patients
-
Comprehensive screening protocols for all patients including testing when available
-
Delay all non-urgent surgical procedures
-
Aggressive hand hygiene protocols
-
Strictly follow PPE guidelines, with use of N95 respirator or PAPR for regions of high infectivity for all patients
-
Monitor the surgical and perioperative teams daily for early signs or symptoms
-
Employ use of telemedicine and virtual visits when appropriate for postoperative care
-
Have regular communication with patients and teams
-
Maintain physical distancing between team members
|
TABLE III -
Summary of Recommendations for Orthopaedic Surgical Procedures to Be Performed on COVID-19-Positive or High-Risk Patients During the Pandemic
-
Continue above recommendations with regard to hand hygiene, delay of non-urgent surgical procedures, team member monitoring, physical distancing, and postoperative care
-
Use multidisciplinary perioperative management of all patients with COVID-19
-
Minimize operating room traffic
-
Consider regional anesthesia when appropriate
-
Use advanced PPE when treating infected and high-risk patients, including PAPR or N95 respirator with surgical togas when gross contamination is likely
-
Use caution with high-speed power tools and electrocautery during surgery
-
Close cardiopulmonary monitoring is needed
-
Perform intubation and extubation outside of operating room
-
Have a dedicated negative-pressure operating room for COVID-19 patients
-
Consider forming dedicated surgical teams to manage COVID-19 patients in the operating room with supplemental education and rotating schedule
-
Expect extended length of stay
|
Appendix
Supporting material provided by the authors is posted with the online version of this article as a data supplement at jbjs.org (https://links.lww.com/JBJS/F891).
References
1. World Health Organization. Coronavirus disease 2019 (COVID-19) situation report 73. 2020 Apr 2. Accessed 2020 Apr 2.
https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200402-sitrep-73-covid-19.pdf?sfvrsn=5ae25bc7_4
2. Kamel Boulos MN, Geraghty EM. Geographical tracking and mapping of coronavirus disease COVID-19/severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) epidemic and associated events around the world: how 21st century GIS technologies are supporting the global fight against outbreaks and epidemics. Int J Health Geogr. 2020 Mar 11;19(1):8.
3. Centers for Disease Control and Prevention. Interim U.S. guidance for risk assessment and public health management of healthcare personnel with potential exposure in a healthcare setting to patients with coronavirus disease (COVID-19). 2020 Mar 7. Accessed 2020 Mar 29.
https://www.cdc.gov/coronavirus/2019-ncov/hcp/guidance-risk-assesment-hcp.html
4. Li C, Ji F, Wang L, Wang L, Hao J, Dai M, Liu Y, Pan X, Fu J, Li L, Yang G, Yang J, Yan X, Gu B. Asymptomatic and human-to-human transmission of SARS-CoV-2 in a 2-family cluster, Xuzhou, China. Emerg Infect Dis. 2020 Mar 31;26(7). Epub 2020 Mar 31.
5. Kimball A, Hatfield KM, Arons M, James A, Taylor J, Spicer K, Bardossy AC, Oakley LP, Tanwar S, Chisty Z, Bell JM, Methner M, Harney J, Jacobs JR, Carlson CM, McLaughlin HP, Stone N, Clark S, Brostrom-Smith C, Page LC, Kay M, Lewis J, Russell D, Hiatt B, Gant J, Duchin JS, Clark TA, Honein MA, Reddy SC, Jernigan JA; Public Health – Seattle & King County; CDC COVID-19 Investigation Team. Asymptomatic and presymptomatic SARS-CoV-2 infections in residents of a long-term care skilled nursing facility - King County, Washington, March 2020. MMWR Morb Mortal Wkly Rep. 2020 Apr 3;69(13):377-1-8.
6. American College of Surgeons. COVID-19 guidelines for triage of orthopaedic patients. 2020 Mar 24. Accessed 2020 Mar 27.
https://www.facs.org/covid-19/clinical-guidance/elective-case/orthopaedics
7. Ambulatory Surgery Center Association. COVID-19: guidance for ASCs on necessary surgeries. 2020 Mar 19. Accessed 2020 Mar 29.
https://www.ascassociation.org/asca/resourcecenter/latestnewsresourcecenter/covid-19/covid-19-guidance
8. Zhou P, Yang XL, Wang XG, Hu B, Zhang L, Zhang W, Si HR, Zhu Y, Li B, Huang CL, Chen HD, Chen J, Luo Y, Guo H, Jiang RD, Liu MQ, Chen Y, Shen XR, Wang X, Zheng XS, Zhao K, Chen QJ, Deng F, Liu LL, Yan B, Zhan FX, Wang YY, Xiao GF, Shi ZL. A pneumonia outbreak associated with a new coronavirus of probable bat origin. Nature. 2020 Mar;579(7798):270-1-8. Epub 2020 Feb 3.
9. Du Z, Xu X, Wu Y, Wang L, Cowling BJ, Meyers LA. Serial interval of COVID-19 from publicly reported confirmed cases. Emerg Infect Dis. 2020 Mar 19;26(6):26. [Epub ahead of print].
10. Lauer SA, Grantz KH, Bi Q, Jones FK, Zheng Q, Meredith HR, Azman AS, Reich NG, Lessler J. The incubation period of coronavirus disease 2019 (COVID-19) from publicly reported confirmed cases: estimation and application. Ann Intern Med. 2020 Mar 10. [Epub ahead of print].
11. Onder G, Rezza G, Brusaferro S. Case-fatality rate and characteristics of patients dying in relation to COVID-19 in Italy. JAMA. 2020 Mar 23. [Epub ahead of print].
12. Wu Z, McGoogan JM. Characteristics of and important lessons from the coronavirus disease 2019 (COVID-19) outbreak in China: summary of a report of 72 314 cases from the Chinese Center for Disease Control and Prevention. JAMA. 2020;323(13):1239-1-8.
13. Zhang G, Zhang J, Wang B, Zhu X, Wang Q, Qiu S. Analysis of clinical characteristics and laboratory findings of 95 cases of 2019 novel coronavirus pneumonia in Wuhan, China: a retrospective analysis. Respir Res. 2020 Mar 26;21(1):74.
14. City of New York. COVID-19: data. Accessed 2020 Mar 31.
https://www1.nyc.gov/site/doh/covid/covid-19-data.page
16. Centers for Disease Control and Prevention. CARE: check and record everyday. 2020 Mar 11. Accessed 2020 Mar 31.
https://www.cdc.gov/coronavirus/2019-ncov/downloads/COVID-19_CAREKit_ENG.pdf
17. Centers for Disease Control and Prevention. Interim infection prevention and control recommendations for patients with confirmed 2019 novel coronavirus (2019-nCoV) or patients under investigation for 2019-ncov in healthcare settings. 2020 Apr 3. Accessed 2020 Apr 3.
https://www.cdc.gov/coronavirus/2019-nCoV/hcp/infection-control.html
18. Centers for Disease Control and Prevention. Strategies to prevent the spread of COVID-19 in long-term care facilities (LTCF). 2020 Mar 21. Accessed 2020 Mar 30.
https://www.cdc.gov/coronavirus/2019-ncov/healthcare-facilities/prevent-spread-in-long-term-care-facilities.html
19. World Health Organization. Infection prevention and control during health care when novel coronavirus (nCoV) infection is suspected. 2020 Mar 19. Accessed 2020 Apr 4.
https://www.who.int/publications-detail/infection-prevention-and-control-during-health-care-when-novel-coronavirus-(ncov)-infection-is-suspected-20200125
20. Cascella M, Rajnik M, Cuomo A, Dulebohn SC, Di Napoli R. Features, evaluation and treatment coronavirus (COVID-19). Treasure Island: StatPearls Publishing; 2020.
21. Wu Y, Xu X, Chen Z, Duan J, Hashimoto K, Yang L, Liu C, Yang C. Nervous system involvement after infection with COVID-19 and other coronaviruses. Brain Behav Immun. 2020 Mar 30. [Epub ahead of print].
22. Chen N, Zhou M, Dong X, Qu J, Gong F, Han Y, Qiu Y, Wang J, Liu Y, Wei Y, Xia J, Yu T, Zhang X, Zhang L. Epidemiological and clinical characteristics of 99 cases of 2019 novel coronavirus pneumonia in Wuhan, China: a descriptive study. Lancet. 2020 Feb 15;395(10223):507-1-8. Epub 2020 Jan 30.
23. Huang C, Wang Y, Li X, Ren L, Zhao J, Hu Y, Zhang L, Fan G, Xu J, Gu X, Cheng Z, Yu T, Xia J, Wei Y, Wu W, Xie X, Yin W, Li H, Liu M, Xiao Y, Gao H, Guo L, Xie J, Wang G, Jiang R, Gao Z, Jin Q, Wang J, Cao B. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. Lancet. 2020 Feb 15;395(10223):497-1-8. Epub 2020 Jan 24.
24. Wang D, Hu B, Hu C, Zhu F, Liu X, Zhang J, Wang B, Xiang H, Cheng Z, Xiong Y, Zhao Y, Li Y, Wang X, Peng Z. Clinical characteristics of 138 hospitalized patients with 2019 novel coronavirus-infected pneumonia in Wuhan, China. JAMA. 2020 Feb 7;323(11):1061-1-8. [Epub ahead of print].
25. Ministero della Salute. [Data provided by the Ministry of Health.] 2020 Apr 13. Accessed 2020 Apr 15. Italian.
http://www.salute.gov.it/imgs/C_17_notizie_4459_0_file.pdf
26. Bialek S, Bowen V, Chow N, Curns A, Gierke R, Hall A, Hughes M, Pilishvili T, Ritchey M, Roguski K, Silk B, Skoff T, Sundararaman P, Ussery E, Vasser M, Whitham H, Wen J; CDC COVID-19 Response Team. Geographic differences in COVID-19 cases, deaths, and incidence - United States, February 12-April 7, 2020. MMWR Morb Mortal Wkly Rep. 2020 Apr 17;69(15):465-1-8.
27. World Health Organization. Coronavirus disease (COVID-19) technical guidance: surveillance and case definitions. Accessed 2020 Apr 2.
https://www.who.int/emergencies/diseases/novel-coronavirus-2019/technical-guidance/surveillance-and-case-definitions
28. Patel A, Jernigan DB; 2019-nCoV CDC Response Team. Initial public health response and interim clinical guidance for the 2019 novel coronavirus outbreak - United States, December 31, 2019-February 4, 2020. MMWR Morb Mortal Wkly Rep. 2020 Feb 7;69(5):140-1-8.
29. New York State Department of Health. NYSDOH COVID-19 tracker. 2020 Apr 2. Accessed 2020 Apr 3.
https://coronavirus.health.ny.gov/county-county-breakdown-positive-cases
30. Chang Liang Z, Wang W, Murphy D, Po Hui JH. Novel coronavirus and orthopaedic surgery: early experiences from Singapore. J Bone Joint Surg Am. 2020 Mar 20. [Epub ahead of print].
31. Chang L, Yan Y, Wang L. Coronavirus disease 2019: coronaviruses and blood safety. Transfus Med Rev. 2020 Feb 21. [Epub ahead of print].
32. Johnson GK, Robinson WS. Human immunodeficiency virus-1 (HIV-1) in the vapors of surgical power instruments. J Med Virol. 1991 Jan;33(1):47-1-8.
33. Hallmo P, Naess O. Laryngeal papillomatosis with human papillomavirus DNA contracted by a laser surgeon. Eur Arch Otorhinolaryngol. 1991;248(7):425-1-8.
34. Subbarayan RS, Shew M, Enders J, Bur AM, Thomas SM. Occupational exposure of oropharyngeal human papillomavirus amongst otolaryngologists. Laryngoscope. 2019 Nov 11. [Epub ahead of print].
35. Parker R. Summary report Stryker T4 Surgical Helmet System filtration testing. 2003 May 14. Accessed 2020 Apr 3.
http://sars.medtau.org/strykerreport.doc
36. Centers for Disease Control and Prevention. Strategies for optimizing the supply of PPE. 2020 Apr 3. Accessed 2020 Apr 4.
https://www.cdc.gov/coronavirus/2019-ncov/hcp/ppe-strategy/index.html
37. Lindsley WG, Martin SB Jr, Thewlis RE, Sarkisian K, Nwoko JO, Mead KR, Noti JD. Effects of ultraviolet germicidal irradiation (UVGI) on N95 respirator filtration performance and structural integrity. J Occup Environ Hyg. 2015;12(8):509-1-8.
38. Heimbuch BK, Wallace WH, Kinney K, Lumley AE, Wu CY, Woo MH, Wander JD. A pandemic influenza preparedness study: use of energetic methods to decontaminate filtering facepiece respirators contaminated with H1N1 aerosols and droplets. Am J Infect Control. 2011 Feb;39(1):e1-1-8. Epub 2010 Dec 9.
39. Mills D, Harnish DA, Lawrence C, Sandoval-Powers M, Heimbuch BK. Ultraviolet germicidal irradiation of influenza-contaminated N95 filtering facepiece respirators. Am J Infect Control. 2018 Jul;46(7):e49-1-8. Epub 2018 Apr 17.
40. Lowe JJ, Paladino KD, Farke JD, Boulter K, Cawcutt K, Emodi M, Gibbs S, Hankins R, Hinkle L, Micheels T, Schwedhelm S, Vasa A, Wadman M, Watson S, Rupp ME. N95 filtering facepiece respirator ultraviolet germicidal irradiation (UVGI) process for decontamination and reuse. Accessed 2020 Mar 25.
https://www.nebraskamed.com/sites/default/files/documents/covid-19/n-95-decon-process.pdf?date=03252020
41. Centers for Disease Control and Prevention. Discontinuation of Transmission-Based Precautions and Disposition of Patients with COVID-19 in Healthcare Settings (Interim Guidance). 2020 Mar 23. Accessed 2020 Mar 30.
https://www.cdc.gov/coronavirus/2019-ncov/hcp/disposition-hospitalized-patients.html
42. American College of Surgeons. COVID-19: elective case triage guidelines for surgical care. 2020 Mar 24. Accessed 2020 Apr 3.
https://www.facs.org/covid-19/clinical-guidance/elective-case
43. World Health Organization. Rational use of personal protective equipment (PPE) for coronavirus disease (COVID-19): interim guidance. 2020 Mar 19. Accessed 2020 Apr 2.
https://apps.who.int/iris/handle/10665/331498
44. American College of Surgeons. PPE recommendations as of April 3, 2020. 2020 Apr 3. Accessed 2020 Apr 3.
https://www.facs.org/covid-19/ppe/additional
45. Guo X, Wang J, Hu D, Wu L, Gu L, Wang Y, Zhao J, Zeng L, Zhang J, Wu Y. Survey of COVID-19 disease among orthopaedic surgeons in Wuhan, People’s Republic of China. J Bone Joint Surg Am. 2020 Apr 8. [Epub ahead of print].
46. Wang X, Pan Z, Cheng Z. Association between 2019-nCoV transmission and N95 respirator use. J Hosp Infect. 2020 Mar 3. [Epub ahead of print].
47. American College of Surgeons. COVID-19 and surgery: frequently asked questions. 2020 Mar 21. Accessed 2020 Apr 3.
https://www.facs.org/covid-19/faqs
48. Wang J, Du G. COVID-19 may transmit through aerosol. Ir J Med Sci. 2020 Mar 24. [Epub ahead of print].
49. Ong S, Khee TT. Practical considerations in the anaesthetic management of patients during a COVID-19 epidemic. Anaesthesia. 2020 Mar 27. [Epub ahead of print].
50. Lie SA, Wong SW, Wong LT, Wong TGL, Chong SY. Practical considerations for performing regional anesthesia: lessons learned from the COVID-19 pandemic. Can J Anaesth. 2020 Mar 24. [Epub ahead of print].
51. Guy D, Bosco J, Savoie F. AAOS guidelines for elective surgery during the COVID-19 pandemic. 2020 Apr 2. Accessed 2020 Apr 15.
https://www.aaos.org/about/covid-19-information-for-our-members/aaos-guidelines-for-elective-surgery/
52. Centers for Medicare & Medicaid Services. Non-emergent, elective medical services, and treatment recommendations. 2020 Apr 7. Accessed 2020 Apr 15.
https://www.cms.gov/files/document/cms-non-emergent-elective-medical-recommendations.pdf
53. Schmidt T. COVID-19 and elective surgery. 2020 Mar 15. Accessed 2020 Apr 15.
https://www.orthoatlanta.com/media/covid19-and-elective-surgery
54. Wright JH, Caudill R. Remote treatment delivery in response to the COVID-19 pandemic. Psychother Psychosom. 2020 Mar 26;1-1-8. [Epub ahead of print].
55. Centers for Medicare & Medicaid Services. Medicare telemedicine healthcare provider fact sheet. 2020 Mar 17. Accessed 2020 Apr 2.
https://www.cms.gov/newsroom/fact-sheets/medicare-telemedicine-health-care-provider-fact-sheet
56. Halonen LM, Vasara H, Stenroos A, Kosola J. Routine follow-up is unnecessary after intramedullary fixation of trochanteric femoral fractures- analysis of 995 cases. Injury. 2020 Mar 10. [Epub ahead of print].
57. American College of Surgeons. COVID-19: recommendations for management of elective surgical procedures. 2020 Mar 13. Accessed 2020 Apr 3.
https://www.facs.org/covid-19/clinical-guidance/elective-surgery