Background

Health systems are under increasing pressure to improve performance including productivity, quality of care, and efficiency in service delivery. To promote optimal performance, health systems hold healthcare organizations such as hospitals accountable for the quality of care they provide through accountability agreements tied to performance targets [1, 2]. Despite such incentives, healthcare organizations face considerable challenges in providing high-quality care and research continues to show that the quality of hospital-based care is less than ideal [3,4,5]. Some researchers contend that this is attributed, in part, to the challenges that healthcare organizations face when integrating new knowledge into practice. Some challenges include dedicating sufficient resources to adopt or implement evidence-informed innovations that enhance service delivery and optimize patient health and outcomes [6].

Healthcare organizations use knowledge translation (KT) approaches to promote the use of evidence-based practices intended to optimize quality of care. The use of knowledge brokers (KBs) is one such approach. KBs are defined as the human component of KT who work collaboratively with stakeholders to facilitate the transfer and exchange of knowledge in diverse settings, [7,8,9]. KBs that facilitate the use of knowledge between people or groups have been referred to as opinion leaders, facilitators, champions, linking agents and change agents whose roles can be formal or informal [10, 11]. These “influencer” roles are based on the premise that interpersonal contact improves the likelihood of behavioral change associated with use or adoption of new knowledge [12]. Research shows that KBs have had a positive effect on increasing knowledge and evidence-based practices among clinicians in hospitals, and on advocating for change on behalf of clinicians to executives [13,14,15]. However, greater insight is needed on how to equip and support KBs, so they effectively promote and enable clinicians to use evidence-based practices that improve quality of care [13, 16, 17].

Middle managers (MMs) play a pivotal role in facilitating high quality care and may play a brokerage role in the sharing and use of knowledge in healthcare organizations [18, 19]. MMs are managers at the mid-level of an organization supervised by senior managers, and who, in turn, supervise frontline clinicians [20]. MMs facilitate the integration of new knowledge in healthcare organizations by helping clinicians appreciate the rationale for organizational changes and translating adoption decisions into on-the-ground implementation strategies [18, 19]. Current research suggests that MMs may play an essential role as internal KBs because of their mid-level positions in healthcare organizations. Some researchers have called for a deeper understanding of the MM role in knowledge brokering, including how MMs enact internal KB roles [16,17,18,19, 21].

To this end, further research is needed on who assumes the KB role and what they do. Prior research suggests that KBs may function across five key roles: knowledge manager, linking agent, capacity builder, facilitator, and evaluator, but it is not clear whether these roles are realized in all healthcare settings [7, 21, 22]. KBs are often distinguished as external or internal to the practice community that they seek to influence, and most studies have focused on external KBs with comparatively little research focused on the role of internal KBs [7, 9, 17, 23, 24]. To address this gap, we will focus on internal KBs (MMs) who hold a pivotal position because their credibility and detailed knowledge of local context allows them to overcome the barriers common to external KBs. One such barrier is resistance to advice from external sources unfamiliar with the local context [25].

With respect to what KBs do, two studies explored KB roles and activities, and generated frameworks that describe KB functions, processes, and outcomes in health care [7, 22]. However, these frameworks are not specific to MMs and are limited in detail about KB roles and functions. This knowledge is required by healthcare organizations to develop KB capacity among MMs, who can then enhance quality of care. Therefore, the focus of this study was to synthesize published research on factors that influence the KB roles, activities, and impact of MMs in healthcare settings. In doing so, we will identify key concepts, themes, and the relationships among them to generate an organizing framework that categorizes how MMs function as KBs in health care to guide future policy, practice, and research.

Methods

Approach

We used a critical interpretive synthesis (CIS) to systematically review the complex body of literature on MM KBs. This included qualitative, quantitative, and theoretical papers. CIS offers an iterative, dynamic, recursive, and reflexive approach to qualitative synthesis. CIS was well-suited to review the MM KB literature than traditional systematic review methods because it integrates findings from diverse studies into a single, coherent framework based on new theoretical insights and interpretations [26, 27]. A key feature that distinguishes CIS from other approaches to interpretive synthesis is the critical nature of the analysis that questions the way studies conceptualize and construct the topic under study and uses this as the basis for developing synthesizing arguments [26]. We ensured rigor by complying with the Enhancing Transparency in Reporting the Synthesis of Qualitative Research (ENTREQ) criteria (Additional file 1) and other criteria of trustworthiness [28, 29]. We did not register a protocol for this review.

Search

With a medical librarian, we developed a search strategy (Additional file 2) that complied with the evidence-based checklist for peer review of electronic search strategies [30]. We included Medical Subject Headings and keywords that captured the concepts of MMs (e.g., nurse administrator, manager), explicit or non-explicit KB roles (e.g., diffusion of innovation, dissemination, broker, and facilitator), evidence-based practice (e.g., knowledge, evidence) and setting (e.g., hospital, healthcare, or health care). We searched MEDLINE, CINAHL, Social Sciences Abstracts, ABI/INFORM, EMBASE, PubMed, PsycINFO, ERIC, and the Cochrane Library from January 1, 2001, to August 14, 2020. We searched from 2001 onward because the field of KT did not substantially investigate KBs until 2001 [7, 21]. We reviewed the reference lists of eligible articles for additional relevant studies not identified by searches. As is typical of CIS, this was an iterative process allowing search terms to be expanded to optimize search results [26, 31].

Eligibility

We generated eligibility criteria based on the PICO framework (population, intervention, comparisons, and outcomes) (Additional file 3). Populations refer to MMs functioning as KBs in hospitals or other healthcare settings but did not necessarily use those labels. Because the MM literature is emergent, we included settings other than hospitals (e.g., public health department, Veteran Affairs Medical Centres). We included studies involving clinical and non-clinical administrators, managers, directors, or operational leaders if those studies met all other inclusion criteria. The intervention of interest was how MM KBs operated in practice for the creation, use and sharing of knowledge, implementation of evidence-based practice(s), or innovation implementation. Study comparisons may have evaluated one or more MM KB roles, approaches and associated barriers, enablers and impacts alone or in comparison with other types of approaches for the sharing or implementation of knowledge, evidence, evidence-based practices, or innovations. Outcomes included but were not limited to MM KB effectiveness (change in knowledge, skills, policies and/or practices, care delivery, satisfaction in role), behaviors, and outcomes. Searches were limited to English language quantitative, randomized, or pragmatic controlled trials, case studies, surveys, quasi-experimental, qualitative, or mixed methods studies and conceptual papers. Systematic reviews were not eligible, but we screened references for additional eligible primary studies. Publications in the form of editorials, abstracts, protocols, unpublished theses, conference proceedings were not eligible.

Screening

FB and ARG independently screened 50 titles and abstracts according to the eligibility criteria and compared and discussed results. Based on discrepancies, they modified the eligibility criteria and discussed how to apply them. Thereafter, FB screened all remaining titles, and discussed all uncertainties with ARG and the research team. FB retrieved all potentially eligible articles. FB and ARG independently screened a sample of 25 full-text articles, and again discussed selection discrepancies to further standardize how eligibility criteria were applied. Thereafter, FB screened all remaining full-text items.

Quality appraisal

We employed quality appraisal tools relevant to different research designs: Standards for Reporting Qualitative Research (SRQR) [32], the Good Reporting of a Mixed Methods Study (GRAMMS) tool [33], Critical Appraisal of a Questionnaire Study [34], Revised Standards for Quality Improvement Reporting Excellence (SQUIRE 2.0) tool [35], and the Critical Appraisal Checklist for Quasi-Experimental Studies [36]. FB and ARG independently assessed and compared the quality of a sample of seven studies each. Thereafter, FB assessed the quality of the remaining 24 studies.

Data extraction

We developed a data extraction form to extract information on study characteristics (date of publication, country, purpose, research design) and MM KB characteristics, roles, activities, enablers, barriers, and impacts. To pilot test data extraction, FB and ARG independently extracted data from the same 25 articles, then compared results and discussed how to refine data extraction. Thereafter, FB extracted data from remaining articles, which was independently checked by ARG, and then reviewed by the research team.

Data analysis

FB and ARG conducted an initial reading and coding of a sample of articles independently. Codes were assigned to significant elements of data within the results and conclusions sections of the eligible articles and grouped into relevant categories with shared characteristics and organized into preliminary themes. This was an iterative process that involved ongoing consultation with the research team, who provided feedback on the codes and themes.

We created a matrix of MM KB roles and activities from extant MM and KB theory [7, 18, 22, 37] and deductively mapped themes from included studies with the matrix to help inform the analysis and interpretation of our findings. As per CIS methodology, we developed an integrative grid (matrix table) where themes pertaining to MM KB roles and activities formed columns, and themes mapped to those roles/activities from individual studies formed rows [31]. The grid helped us integrate the evidence across studies and explore relationships between concepts and themes to inductively develop synthetic constructs [31, 38]. Using a constant comparative approach, we critiqued the synthetic constructs with the full sample of papers to identify conceptual gaps in the available evidence in relation to our aims, and to ensure that the constructs were grounded in the data [31, 38]. Our interpretive reflections on MM KB roles, activities, factors, and impacts led us to develop “synthetic arguments” and we used the arguments to structure our findings (attributes, roles, activities, impacts, enablers, barriers) in an organizing framework to capture our interpretation of how MMs function as KBs in healthcare organizations. We used NVivo 12 software to assist with data analysis.

Results

Search results

The initial search yielded 9936 articles. Following removal of duplicates, 9760 titles were not eligible, and 176 items were retrieved as potentially relevant. Of those, 135 were excluded because the study design was ineligible (25), they did not examine MMs (27) or MM KBs (34), were not focused on the evaluation of an MM KB role (39), were editorials (4), or the publication was a duplicate (6). We included 41 articles for review (Fig. 1 PRISMA flow diagram). Additional file 4 includes all data extracted from included studies.

Fig. 1
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PRISMA flow diagram

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Study characteristics

Eligible articles were published between 2003 and 2019. Three (7.3%) were conceptual and 38 (92.7%) were empirical studies. Conceptual articles discussed MM and KB theoretical constructs. Table 1 summarizes study characteristics. Studies examined the impacts of change efforts (47.3%), barriers to practice change (34.2%), and evaluation of KB interventions (18.4%). Most were qualitative (52.6%) and conducted in the United States (36.8%). Of study participants (34.2%) were MMs. In most studies, participants were nurses (63.1%) or allied health (13.2%) and based in hospitals (68.4%). Otherwise, (31.6%) were based in public health or occupational health departments, primary health care centers, Veterans Affairs Medical Centres, community care, and a senior’s care facility.

Table 1 Study Characteristics
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Quality assessment findings

A critical analysis of the included studies revealed issues related to research design, varying from data collected from heterogeneous healthcare settings and diverse types of MMs to the type of analyses completed (e.g., qualitative, mixed methods), to the strength of conclusions drawn from a few studies’ results (e.g., correlational, or causal). Fifteen (39.5%) studies met the criteria for quality. Twenty-three (60.5%) studies had minor methodological limitations (e.g., no research paradigm identified in qualitative studies, and mixed methods studies did not describe the integration of the two methods) (Additional file 5). These methodological flaws did not warrant exclusion of any studies as they provided relevant insights regarding the emerging framework.

MM KB attributes

Seven (18.4%) studies described MM KB attributes (Table 2). Of those, 4 (10.5%) identified MM attributes, 2 (5.2%) identified KB attributes, and 1 (2.6%) identified nurse knowledge broker attributes. MM KBs were described as confident, enthusiastic, and experienced with strong research skills [41, 45]. They were also responsive and approachable, with an understanding of the complexity of an innovation and the organizational context [42,43,44].

Table 2 MM KB Attributes
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MM KB roles and activities

Table 3 summarizes themes pertaining to roles and activities. A total of 63 activities were grouped in the following 12 MM KB roles: (1) gather data, (2) coordinate projects, (3) monitor and evaluate the progress of a project, (4) adjust implementation to organizational context, (5) disseminate information, (6) facilitate networks, (7) bridge the evidence-to-practice gap, (8) engage stakeholders, (9) convince others of the need for, and benefit of a project, (10) coach staff, (11) provide tools and resources and (12) function as a strategic influencer. Roles did not differ among MM KBs in hospital and non-hospital settings.

Table 3 Themes representing MM KB roles and activities
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Table 4 summarizes the frequency of each of the 12 MM KB roles across included studies. The two most common MM KB roles were to monitor and evaluate the progress of a project (14, 36.8%) [40, 41, 47,48,49,50,51, 54, 57, 60, 63,64,65,66] and to convince others of the need for, and benefit of a project (12, 31.6%) [46,47,48, 50, 51, 55, 58, 61, 64,65,66,67]. For example, MM KBs played an important role in monitoring the progress of projects to evaluate and reinforce practice change [41, 50]. To convince others of the need for, and benefit of a project and to promote staff buy-in, they held ongoing conversations with staff to help them understand the rationale for change, reinforce the message, and encourage staff to consistently maintain the innovations on their units [46, 48, 66]. The least common MM KB role was project coordination (4, 10.5%) [39, 47, 48, 56].

Table 4 Frequency of 12 MM KB roles in included studies
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Several of the identified MM KB roles aligned with five KB roles in prior published frameworks [7, 22] and MM role theory [18, 37] (Table 5). For example, 31 (81.6%) studies described MM KB roles of gather data, project coordination, disseminate information, and adjust implementation to organizational context, which aligned with the roles and activities of a KB knowledge manager. Twenty-nine (76.3%) studies described the MM KB roles of provide tools and resources, convince others of the need for and benefit of a project, and coach staff, which aligned with the roles and activities of a KB capacity builder. We found overlap between the MM KB roles and the four hypothesized roles in MM role theory: (1) disseminate and obtain information, (2) adapt information and the innovations, (3) mediate between strategy and day to day activities, and (4) selling innovation implementation) [18, 37]. For example, we found that as capacity builders, MM KBs also mediated between strategy and day-to-day activities such as coaching staff and providing resources, and in the role of knowledge manager, MM KBs obtained, diffused, and synthesized information [18, 37].

Table 5 MM KB roles in included studies mapped to roles in published KB frameworks
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While MM KB roles identified in included studies aligned with the five previously identified KB roles, the CIS approach we employed identified 12 distinct roles that were further characterized based on corresponding activities associated with each of the 12 roles. Therefore, while this research agrees with prior work on MM KB roles, it represents a robust framework of MM KB roles and activities by elaborating the complexity of MM KB roles and activities.

We fully described two roles compared with prior frameworks: to convince others of the need for and benefit of a project, and function as a strategic influencer. To convince others of the need for and benefit of a project (e.g., a quality improvement, best practice guideline implementation, or innovation), MM KBs used tactics such as role modelling their commitment, providing the rationale for the change, being enthusiastic about its adoption, offering positive reinforcement, and providing emotional support [47, 50, 58]. The role of strategic influencer featured in 7 (18.4%) studies [39, 48, 52, 56, 62, 65, 68]. For example, MM KBs were influential at the executive level of the hospital, advocating for innovations among less involved team members and administrators, including the hospital board, were members of organizational decision-making groups for strategic planning, and served as an authoritative contact for initiatives.

Factors that influence MMs knowledge brokering

Table 6 summarizes the enablers and barriers of MM KB roles and activities, organized as individual or organizational factors. We identified four enablers at the organizational level: senior management support, availability of resources, engaged staff, and alignment to strategy. The most common was senior management support, featured in 12 (32.0%) studies. We found that senior management support enhanced the commitment of MM KBs to innovation implementation [16, 17, 19, 44, 45, 52, 61, 63, 66,67,68,69,70]. For example, senior managers empowered and supported MM KBs to make decisions by ensuring that the necessary structures and resources were in place, and by conveying that the implementation was an organizational priority [66, 68]. We identified three individual-level facilitators: training and mentorship, personal attributes, and experience in the MM role. The most common facilitator was training and mentorship, featured in 8 (21.1%) studies. We found that training and mentorship with more experienced managers was important to the success of MM KBs and their projects, especially if they were new to their role [16, 17, 19, 41, 42, 48, 54, 68].

Table 6 Factors that influenced MM KB roles, activities, and impacts
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Studies reported more barriers (n = 8) than enablers (n = 7). We found four organizational barriers: a lack of resources, lack of senior management support, staff resistance, and a lack of time. The most common barriers were lack of resources in 12 (32.0%) studies and lack of time in 12 (32.0%) studies. A lack of resources (budget constraints, limited staff) made it challenging for MM KBs to move their projects forward [39, 42, 44, 47, 52, 55, 57, 64, 68,69,70,71]. For example, inadequate funds interfered with obtaining appropriate resources and undermined the feasibility of implementing projects [47, 55]. In addition, staffing issues created difficulty in engaging staff in project work and low staffing levels limited capacity to provide desired standards of care [42, 64]. Additionally, a lack of protected time for data collection or other project work was identified as a significant barrier to implementing projects [17, 19, 39, 42, 44, 47, 52, 55, 57, 64, 68, 71]. MM KBs also lacked the time to nurture, support and adequately coach staff [39, 55].

We identified four individual-level barriers: lack of formal training, dissatisfaction with work life balance, being caught in the middle, and professional boundaries. The most common barriers were lack of formal training (8, 21.1%) and dissatisfaction with work life balance (8, 21.1%). For example, a lack of formal training resulted in MM KBs being unprepared for managerial roles and without the knowledge and skills to promote effective knowledge brokering and knowledge transfer with end users [17, 39, 41, 42, 55, 57, 69, 71]. We also found that heavy workloads and conflicting priorities left MM KBs often dissatisfied with their work life balance and hindered their ability to successfully complete projects [42, 44, 51, 52, 57, 61, 64, 71]. For example, because of multiple responsibilities and conflicting priorities, MM KBs were often pulled away to address problems or were so absorbed by administrative tasks that they had no time to complete project responsibilities [44, 64].

Impact on service delivery and outcomes

Eight (21.1%) studies showed that MM KBs had some impact on organizational and provider outcomes [16, 40, 43, 44, 47, 56, 62, 67]. One (2.6%) study reported that practice changes were greater when associated with higher MM leadership scores (OR 1.92 to 6.78) and when MMs worked to help create and sustain practice changes [40]. One (2.6%) study reported the impact of senior managers’ implementation of an evidence-based Hospital Elder Life Program on administrative outcomes (e.g., reduced length of stay and cost per patient), clinical outcomes (e.g., decreased episodes of delirium and reduced falls), and provider outcomes (e.g., increased knowledge and satisfaction) [67].

Two (5.3%) studies reported the impact of a Clinical Nurse Leader role on care processes at the service level in American hospitals. Benefits were evident in administrative outcomes such as RN hours per patient day (increased from 3.76 to 4.07) and in reduced surgical cancellation rates from 30 to 14%. There were also significantly improved patient outcomes in dementia care, pressure ulcer prevention, as well as ventilator-assisted pneumonia [56, 62]. One (2.6%) study reported financial savings [56].

Four (10.5%) studies reported the effect of a KB strategy on health professionals’ knowledge, skills, and practices [16, 43, 44, 47]. For example, Traynor et al. [44] found that participants who worked closely with a KB showed a statistically significant increase in knowledge and skill (average increase of 2.8 points out of a possible 36 (95% CI 2.0 to 3.6, p < 0.001) from baseline.

Organizing framework of MM KBs in healthcare organizations

We sought to capture the roles, activities, enablers, barriers and impacts of MM KBs across diverse healthcare settings in an organizing framework (Fig. 2 Organizing framework of MMs who function as knowledge brokers in healthcare organizations). From our interpretation of the published evidence, the findings across studies were categorized into 12 roles and 63 associated activities to represent specific ways in which MM KBs described their roles and activities during project implementation. Influencing factors were categorized into individual and organizational enablers and barriers that influence the efforts of MM KBs in healthcare organizations. While attributes were categorized as enablers, their level of importance as enablers emerged from our synthesis in how they operated in practice. The types of outcomes that we examined also varied between changes in care practice, processes, and competencies which we constructed into provider and organizational outcomes. Our emergent insights were used to construct four synthesizing arguments from the available literature: (1) MM KBs have attributes that equip and motivate them to implement practice change and innovations in healthcare organizations, (2) MMs enact KB roles and activities in healthcare organizations, (3) enablers and barriers influence the knowledge brokering efforts of MMs in healthcare settings; and (4) MM KB efforts impact healthcare service delivery. These synthesizing arguments were used to structure the organizing framework presented in Fig. 2, which depicts how MM function as KBs in healthcare organizations and their impact on service delivery.

Fig. 2
figure 2

Organizing framework of MMs who function as knowledge brokers in healthcare organizations

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Discussion

We conducted a CIS to synthesize published research on factors that influence the roles, activities, and impacts of MM KBs in healthcare organizations. As per CIS, our output was an organizing framework (Fig. 2) that promotes expansive thinking about and extends knowledge of MM KBs in healthcare settings. We identified 63 activities organized within 12 distinct MM KB roles, which is far more comprehensive than any other study [7, 22]. We build on prior frameworks and characterize further the roles of strategic influencer and convincing others of the need for, and benefit of an innovation or evidence-based practice. We identified organizational and individual enablers and barriers that may influence the efforts and impact of MM KBs in health care. Of note, a key enabler was senior leadership support while a key barrier for MM KBs was a lack of formal training in project implementation. Such factors should be closely considered when looking at how to strengthen the MM KB role in practice. Furthermore, we found that the MM KB role was associated with enhanced provider knowledge and skills, as well as improved clinical and organizational outcomes.

We offer a novel conceptualization of MM KBs in healthcare organizations that has, thus far, not been considered in the literature. Our theoretical insights (summarized in Fig. 2) are an important first step in understanding how individual and organizational factors may influence how MMs enact KB roles, and the impact they have on service delivery and associated outcomes. We found that the many MM KB roles and activities corresponded to the characterization of KB roles in the literature and substantiated MM role theory. Our findings corroborate previous studies and systematic reviews by confirming that MMs function as KBs and build on the MM and KB theoretical constructs previously identified in the literature [7, 18, 21, 22, 37, 46, 48]. Building on Birken and colleagues’ theory [37], we found significant overlap between MM and KB roles and activities. Figure 2 helps to define and analyze the intersection of these roles while distinguishing MM KB roles and activities more clearly from other administrative roles.

We contend that Fig. 2 has applicability across a range of healthcare settings and may be used by hospital administrators, policymakers, service providers, and researchers to plan projects and programs. It may be used as a resource in strategic planning, to re-structure clinical programs, build staff capacity, and optimize HR practices. For example, Fig. 2 could be used as a foundation to establish goals, objectives, or key performance indicators for a new or existing clinical program; refine job postings for MM roles to encompass optimal characteristics of candidates to enable KB activities; or identify new evaluation criteria for staff performance and training gaps in existing HR practices. It could also help decision makers take on pilot projects to formalize the KB role in healthcare.

Figure 2 is intended to foster further discussion of the role that MMs play in brokering knowledge in healthcare settings. It can be modified for specific applications, although we encourage retaining the basic structure (reflecting the synthesizing arguments). For example, the factors may change depending on specific localized healthcare contexts (i.e., acute care versus long-term care, or rehabilitation). Although the use of our framework in practice has yet to be evaluated, it may be strengthened with the results of additional mixed methods studies examining MM KBs as well as quasi-experimental studies applying adapted HR practices based upon our framework. As more studies are reported in the literature, the roles, activities, factors, and outcomes can be further refined, organized, and contextualized. Figure 2 can also be used as a guide for future studies examining how MMs enact the KB role across healthcare settings and systems, disciplines, and geographic locations.

Our synthesis provides new insights into the roles of MM KBs in healthcare settings. For example, we further elucidate two MM KB roles: 1) functioning as a strategic influencer; and 2) convincing others of the need for, and benefit of an innovation or evidence-based practice. These are important roles that MM KBs enact when preparing staff for implementation and corroborate Birken et al.’s hypothesized MM role of selling innovation implementation [18, 37]. Our findings validate the organizational change literature that emphasizes the important information broker role MMs play in communicating with senior management and helping frontline staff achieve desired changes by bridging information gaps that might otherwise impede innovation implementation [37]. Our new conceptualization of how MM KBs navigate and enact their roles, and the impact they may have on service delivery and associated outcomes extends the findings of recent studies. These studies found that the role of MMs in organizational change is evolving and elements such as characteristics and context may influence their ability to facilitate organizational adaptation and lead the translation of new ideas [53, 72, 73]. However, further research is required to test and further explicate these relationships in the broader context of practice change.

Our synthesis both confirms and extends previous research by revealing organizational and individual factors that both enabled and hindered MM KBs efforts in healthcare organizations. An important organizational factor in our study was having senior management support. We found that MM KBs who had healthy supportive working relationships with their senior leaders led to project success. This support was critical because without it they experienced significant stress at being “caught in the middle” trying to address the needs of staff while also meeting the demands of senior management. Recent studies confirm our finding that senior management engagement is essential to MM KBs’ ability to implement innovations and underscores the need for senior leaders to be aware of, and acknowledge, the impact that excessive workload, competing demands, and role stress can play in their effectiveness [19, 74].

The personal attributes of MM KBs as well as their level of experience were both important factors in how they operated in practice. We identified that key attributes of MM KBs contributed to their ability to drive implementation of initiatives and enhanced staff acceptance and motivation to implement practice change [75, 76]. Our findings corroborate recent studies that highlight how the key attributes of effective champions (those that are intrinsic and cannot be taught) [77,78,79] may contribute to their ability to lead teams to successful implementation outcomes in healthcare organizations [80,81,82]. We also found that experienced MM KBs were well trained, knowledgeable, and better prepared to understand the practice context than novice MM KBs, but a lack of formal training in project implementation was an impediment for both. This emphasizes the importance of providing opportunities for professional development and training to prepare both novice and experienced MM KBs to successfully implement practice change. Our findings contribute to the growing knowledge base regarding what makes an effective MM KB. However, future research should focus on generating evidence, not only on the attributes of MM KBs, but also on how those attributes contribute to their organizational KB roles as well as the relationships among specific “attributes” and specific KB roles. More research is also needed to better understand how and what skills can be taught to boost the professional growth of MM KBs in health care.

Organizational theory and research may provide further insight into our findings and guidance for future research on the role of MM KBs in healthcare organizations. For example, the literature suggests that by increasing MMs’ appreciation of evidence-based practice, context, and implementation strategies may enhance their role in implementing evidence-based practices in healthcare organizations [18, 83, 84]. We found that MM KBs’ commitment to the implementation of an evidence-based project was influenced by the availability of resources, alignment with organizational priorities, a supportive staff and senior leadership. Extending from organizational theory and research, further investigation is needed to explore the nature of the relationship between these factors and the commitment of MM KBs to evidence-based practice implementation and subsequent outcomes.

When assessing the impact of MM KBs in hospitals, we found some evidence of changes in organizational and provider outcomes, suggesting MM KB impact on service delivery. Given that the available outcome data were limited, associational in nature, or poorly evaluated, it was challenging to identify strong thematic areas. Like our study, several systematic reviews also reported the lack of available outcome data [7, 18, 21]. This highlights an important area for research. Future research must include evaluation of the effectiveness of MM KBs and establish rigorous evidence of their impact on service delivery.

Our findings have important implications for policy and practice. MMs are an untapped KB resource who understand the challenges of implementing evidence-based practices in healthcare organizations. Both policy makers and administrators need to consider the preparation and training of MM KBs. As with other studies, our study found that providing MM KBs with opportunities for training and development may yield a substantial return on investment in terms of narrowing evidence-to-practice gaps in health care [48]. Thus, an argument can be made for recruiting and training MM KBs in health care. However, the lack of guidance on how to identify, determine and develop a curriculum to prepare MM KBs requires more research.

Our synthesis revealed numerous activities associated with 12 MM KB roles providing further insight into the MM role in healthcare settings. Our list of 63 activities (Table 2) has implications for practice. We found that MMs enact numerous KB roles and activities, in addition to their day-to day operational responsibilities, highlighting the complexity of the MM KB role. Senior leaders and administrators must acknowledge this complexity. A greater understanding of these KB roles and activities may lead to MM implementation effectiveness, to sustainable MM staffing models, and to organizational structures to support the KB efforts that many MMs are already doing informally. For example, senior leaders and administrators need to take the MM KB role seriously and explicitly include KB activities as a core function of existing MM job descriptions. To date, the KB role and associated activities are not typically or explicitly written into the formal job descriptions for MMs in healthcare settings, as their focus is primarily on operational responsibilities. A formal job description for MM KBs would improve the KB capacity of MMs by giving them the permission and recognition to implement KB-related functions. Our findings inform future research by more clearly articulating the MM KB roles and activities that may be essential to the implementation of evidence-based practice and highlights a much-needed area for future work.

Our study features both strengths and weaknesses. One strength in using CIS methodology was the ability to cast a wide net representing a range of research designs of included studies. This included studies in which MMs were required to be KBs by senior leaders or functioned explicitly as KBs. This enabled us to identify and include diverse studies that made valuable theoretical contributions to the development of an emerging framework, which goes beyond the extant theories summarized in the literature to date [18]. In contrast to prior systematic reviews of MM roles in implementing innovations [18], the CIS approach is both systematic and iterative with an interpretive approach to analysis and synthesis that allowed us to capture and critically analyze an in-depth depiction of how MMs may enact the KB role in healthcare organizations. Our synthesis also revealed numerous activities associated with the 12 identified MM KB roles. The resulting theoretical insights were merged into a new organizing framework (Fig. 2). These insights are an important first step in understanding how individual and organizational factors may influence how MMs enact KB roles, and the impact they have on service delivery.

Although CIS is an innovative method of synthesizing the literature and continues to evolve, it does have limitations. CIS has yet to be rigorously evaluated [85, 86]. While there is some precedent guiding the steps to conduct a CIS, one weakness is that CIS is difficult to operationalize. Another weakness is that the steps to conduct CIS reviews are still being refined and can lack transparency. Therefore, we used standardized, evidence-based checklists and reporting tools to assess transparency and methodological quality, and an established methodology for coding and synthesis. We provided an audit trail of the interpretive process in line with the ENTREQ guidance. Still, there was a risk of methodological bias [28, 85, 86]. Another weakness of qualitative synthesis is its inability to access first order constructs that is the full set of participants’ accounts in each study. As reviewers, we can only work with the data provided in the papers and, therefore, the findings of any review cannot assess primary datasets [31]. Study retrieval was limited to journals that are indexed in the databases that were searched. We did not search the grey literature, assuming that most empirical research on MM KBs would be found in the indexed databases. Finally, we may have synthesized too small a sample of papers to draw definitive conclusions regarding different aspects of MMs as KBs.

Conclusion

Our study is a first step in advancing the theoretical and conceptual conversation regarding MM KBs by articulating the attributes, roles, activities, and factors influencing their efforts and impact. Through the generation of a novel organizing framework, we identify a potential combination of roles for those in MM positions who may also function as KBs in healthcare organizations. Our study is a timely contribution to the literature and offers an initial understanding of extant evidence of the KB role MMs play in health care. Our framework has utility for policymakers, administrators, and researchers to strengthen the MM role and, ultimately, improve quality of care.