Abstract
Background
Recently, the use of smartphones to deliver health-related content has experienced rapid growth, with more than 165,000 mobile health (mHealth) apps currently available in the digital marketplace. With 3 out of 4 Canadians currently owning a smartphone, mHealth apps offer opportunities to deliver accessible health-related knowledge and support. Many individuals experience pain after surgery, which can negatively impact their health-related quality of life, including sleep, emotional, and social functioning. Smartphone apps that provide remote real-time monitoring and symptom management have the potential to improve self-management skills in patients experiencing postoperative pain. Increased confidence and practice of self-management skills could contribute to decreased postoperative pain and reduce risk of developing persistent pain. Published reviews of general pain self-management apps demonstrate a lack of evidence-based content, theoretical grounding, and health care professional involvement. However, no review to date has focused on the app marketplace specific for individuals with postoperative pain.
Objective
The aim of this study was to characterize and critically appraise the content and functionality of commercially available postoperative pain self-management apps.
Methods
An electronic search and extraction was conducted between December 2016 and March 2017 of the official Canadian app stores for the three major smartphone operating systems (iPhone operating system [iOS], Android, and Windows). Stores were searched separately using predetermined search terms. Two authors screened apps based on information provided in the public app description. Metadata from all included apps were abstracted into a standard spreadsheet. Two authors verified the data with reference to the apps and downloaded apps themselves. The content and functionality of each app as it pertained to postoperative pain self-management was rated.
Results
A total of 10 apps met the inclusion criteria. All included apps were designed exclusively for the Android platform. Education was the most common self-management feature offered (8/10, 80%), with none of the apps offering features related to goal setting or social support. Overall, no single app was comprehensive in terms of pain self-management content. Five (50%) apps reported the involvement of a health care provider in their development. However, not a single app involved end users in their development, and none of the apps underwent scientific evaluation. Additionally, none of the apps were designed for use in pediatric patients.
Conclusions
Currently available postoperative pain apps for patients lack evidence-based content, goal setting, and social support functions. There is a need to develop and test comprehensive theory-based apps to support patients with pain self-management care following surgery.
Keywords: pain, postoperative; smartphone; mobile applications; review; pain management; self care
Introduction
Background
More than 80% of patients experience acute postoperative pain after surgery, of whom approximately 75% report their pain intensity as moderate, severe, or extreme [1,2]. Unrelieved or undertreated acute postoperative pain can delay remobilization, lead to increased opioid use and related side effects, and negatively impact all aspects of health-related quality of life [3-5]. Greater confidence in one’s ability to control pain is referred to as pain coping self-efficacy. Improvements in pain coping self-efficacy may contribute to decreased postoperative pain and reduced risk for developing persistent postoperative pain, an expensive and debilitating health problem [6,7]. Thus, the prevention or minimization of postoperative pain is critically important.
Remote real-time monitoring and symptom management support for postoperative pain patients is a relatively new notion made possible by technological advances. Smartphones, for instance, are now widely used across the life span [8,9]. Smartphones have the potential to empower people with postoperative pain who are at increased risk for undertreatment of pain and disruption in activities of daily living [10]. Smartphones can support self-management by (1) improving self-monitoring of pain and other symptoms in everyday environments (eg, home, hospital settings), (2) promoting pain self-efficacy and appropriate self-care (eg, adherence to prescribed medications, cognitive-behavioral pain coping strategies), and (3) minimize barriers to optimal pain treatment (eg, lack of transportation to tertiary care centers) [11,12].
Existing Reviews of Pain Management Apps
There are a growing number of generalized pain self-management smartphone apps available for users to download on their personal mobile devices. In a 2011 scoping review, Rosser and Eccleston identified 111 such apps [13]. A majority were designed for the iPhone (iPhone operating system, iOS) platform, with fewer being available for Android or BlackBerry operating systems. The primary app functions included education skills training (50.5%; 56/111), self-monitoring (eg, pain diary, 26.1%; 29/111), and relaxation training (21.6%; 24/111). Importantly, 85.6% (95/111) of the identified apps did not report the involvement of health care professionals in their design or evaluation of content. None of the apps were focused on postoperative pain [13]. In 2012, Reynoldson and colleagues conducted an updated search of the iOS and Android stores [14]. This search only included apps with a primary self-monitoring function (ie, allowing patients to track their pain episodes). Apps were excluded if their intended use was limited to pain from specific conditions such as arthritis, inflammatory bowel disease, or migraine. The authors identified 12 eligible apps, which then underwent content analysis and usability testing. Their review identified a lack of user and clinician engagement in pain app development, as well as variation in app quality [14]. In 2015, Lalloo and colleagues conducted an updated scoping review of available pain management apps [15]. A total of 279 apps met the inclusion criteria. Pain self-care skill support was the most common self-management function (77.4%; 216/279). Apps also purported providing patients with the ability to engage in pain education (45.9%; 128/279), self-monitoring (19.0%; 53/279), social support (3.6%; 10/279), and goal setting (0.7%; 2/279). No apps were comprehensive in terms of pain self-management, with the majority of apps including only a single self-management function (58.8%; 164/279). Additionally, only 8.2% (23/279) of the apps included a health care professional in their development, not a single app provided a theoretical rationale, and only 1 app underwent scientific evaluation [15].
Objectives
To our knowledge, no scoping review to date has focused on apps for postoperative pain management. In addition, no scoping reviews to date have sought to identify apps for both pediatric and adult users. Therefore, the objectives of this study were to (1) characterize the current field of patient-focused pain self-management apps across all major smartphone platforms in Canada; (2) critically appraise the content and functionality of these apps, including self-care skill support, pain education, self-monitoring, social support, and goal setting; and (3) identify gaps in the field to guide future development of an app to support individuals with postoperative pain.
Methods
An electronic search and extraction was conducted between December 2016 and March 2017 of the official Canadian app stores for the 3 major smartphone operating systems: iOS (iTunes App Store), Android (Google Play Store), and Windows (Windows Store). The entire stores were searched separately using predetermined search terms (ie, no restrictions related to store subcategories such as “health and wellness” were imposed). The search terms were as follows: “Pain, Surgery,” “Pain, Post-Surgery,” “Pain, Post-Surgical,” “Pain, Operative,” “Pain, Operation,” “Pain Management, Surgery,” “Pain Management, Post-Surgery,” “Pain Management, Post-Surgical,” “Pain Management, Operative,” “Pain Management, Operation.”
No limits were imposed related to language or date of app publication. Given that the process for app indexing exhibited variability across app stores, a calibration exercise was conducted before app selection in order to verify our ability to detect postsurgical pain apps. Specifically, we tested our search criteria for the ability to find postsurgical pain apps that were known to be currently available in the app stores. In all cases, our search criteria identified the apps we expected to find.
Screening and Selection of Apps
Apps were included in the study if the primary intended user of the app was a person undergoing surgery, and a stated goal of the app was to provide education, tools, or advice related to managing pain after surgery. Apps were excluded if they focused only on the services offered by specific hospitals because they were intended as advertisements for these sites. These clinic apps typically included only lists of the pain management services and personnel available at the hospital and directions to the clinic rather than self-management programming. Apps were also excluded if they were classified as e-books by the respective app store or were judged by the reviewers as such. An e-book was defined as an app that did not provide any additional content or functionality beyond a textbook (eg, written content identical to a book). Authors performed app selection independently and all discrepancies regarding selection were resolved through discussion with a third author. Apps were screened based on the information provided in the app description section of each respective app store. Apps that met all screening criteria were downloaded and reviewed to confirm eligibility, and then data abstraction and content assessment were completed.
Data Abstraction
Metadata from all included apps were abstracted into a Microsoft Excel spreadsheet. Abstracted metadata included app name, URL, app description, customer rating on the day of store search, number of installations, and price. A systematic approach to data abstraction was used. Specifically, 2 authors (CDC and JR) abstracted all data and 2 others (CL and US) verified the data with reference to the app website and the downloaded apps themselves.
Content Assessment
To assess the comprehensiveness of app self-management content, the following criteria were used: (1) having a postoperative pain tracking function, (2) ability to set goals related to improving pain and functioning, (3) provision of skills training related to specific pain self-care strategies, (4) provision of social support, (5) provision of education related to surgery, and (6) provision of education related to pain after surgery. For each criterion, we assessed coverage as either present or absent. Similar criteria were used in our 2015 published scoping review [15] of general pain self-management apps. This list is based on the features of pain self-management programs that have been examined for effectiveness in scientific trials [16-19].
We also assessed whether a regulated health care professional had provided clinical expertise related to development of the app content and function. An app was required to reference the involvement of a health care professional listed in the Ontario Regulated Health Professions Act [20] to meet this criterion. This list contains 26 health care regulatory colleges to whom the Ontario government has endowed the capacity to regulate the practices of corresponding health care professionals to ensure safe and ethical patient care. The list includes professions such as physicians, nurses, and physiotherapists. If an app claimed the input of a profession that was not listed in the Act in its development, we assessed the health care professional involvement as absent. The involvement of end users (eg, surgery patients) in app development was also documented as present or absent. Apps were reviewed to determine whether they were designed for pediatric (aged 18 years or younger) or adult users.
The app store descriptions were also screened for any reference to the app being part of formal scientific research. The app description and corresponding developer website (if available) were reviewed to determine whether any specific theoretical framework had been used to guide the development of app content. Finally, large publicly accessible scientific literature databases (ie, NCBI PubMed and Google Scholar) were searched using the app name as a query for any published research related to the app. The MyHealthApps website was also reviewed as per the methods of de la Vega and Miro [21]. Descriptive statistics were used to summarize the results of the content assessment.
Results
App Screening
Our search strategy across iTunes, Windows, and Google Play app stores identified a total of 1019 apps (923 Android, 93 iPhone, and 3 Windows), which were screened according to the inclusion and exclusion criteria. Only 10/1019 apps (0.98% of total screened) met all inclusion criteria and were included in the analysis (see Figure 1 for PRISMA [Preferred Reporting Items for Systematic Reviews and Meta-Analyses] flowchart) [22]. All included apps were designed exclusively for the Android platform (see Table 1 for included apps).
Figure 1.
PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) flowchart of app review process.
Table 1.
Postoperative pain apps included in the review.
| # | App | Developer |
| 1 | Activity Heals 1on1 | Elevenity |
| 2 | Breast Implant Exercises | Chicago Plastic Surgery |
| 3 | BW MyTENS | Visiomed Lab |
| 4 | Doado Your Health Companion | Alex Spriet |
| 5 | Fuse—Post Op. Journal | Imbas Solutions |
| 6 | Healing Power | Phil Shapiro |
| 7 | My Hip Rehab | App Squid |
| 8 | Physiotherapy Help Guide | Creativity Knowledge App |
| 9 | Pocket Physio | Care UK HC |
| 10 | Surgeon on Call | Phoenix Medical Consulting |
Self-Management Content of Reviewed Apps
Education related to postoperative pain was the most common self-management feature offered across the identified apps. This educational content largely focused on self-care advice following surgery, particularly physiotherapy exercises to support return to mobility. However, there was no specific content related to emotional factors such as anxiety or catastrophizing related to surgery. As well, none of the apps offered features related to goal setting or social support. Overall, no single app was comprehensive in terms of pain self-management content. Additionally, no apps were designed specifically for pediatric patients. See Figure 2 for a summary of the self-management components across all reviewed apps.
Figure 2.
Self-management content across reviewed apps.
App Cost, Customer Ratings, and Number of Installs
Most apps (8/10, 80%) were free to download with the exceptions of Surgeon on Call and My Hip Rehab, which were associated with charges of Can $0.99 and Can $10.22, respectively. App store customers had the option of rating each app on a scale ranging from 1 to 5 stars (no anchors provided). There was a high variability in the number of users who chose to rate each app (range of 2-380 raters per app). As seen in Figure 3, the average customer rating ranged from 2 to 4.8 stars. However, fewer than 10 customers reviewed most (7/10, 70%) of the apps. The number of app installs ranged from as low as 10 to as high as 100,000 across apps (see Table 2).
Figure 3.
Customer-generated app ratings. *No customer ratings, or less than 2 ratings, were available for three apps: Fuse – Post-Op Journal, Surgeon on Call, and Healing Power.
Table 2.
App installations. Categories provided by Android Google Play Store. Data collected on April 26, 2017.
| Number of installs | Apps |
| 10-50 | Surgeon on Call; My Hip Rehab |
| 100-500 | Fuse–Post Op. Journal; Healing Power |
| 500-1000 | Activity Heals 1on1; BW MyTENS |
| 1000-5000 | Breast Implant Exercises |
| 5000-10000 | Pocket Physio |
| 10,000-50,000 | Doado Your Health Companion |
| 50,000-100,000 | Physiotherapy Help Guide |
Involvement of Health Care Providers, End Users, and Scientific Evaluation
Overall, 5/10 (50%) apps reported the involvement of a health care provider in their development. In summary, Doado Your Health Companion and Pocket Physio involved a physiotherapist, while Breast Implant Exercises and Healing Power involved a physician, and Surgeon on Call involved a specialist (surgeon). The other apps did not report any involvement of health care professionals in their development. None of the apps reported involvement of end users (eg, surgical patients) in their development. No evidence was found indicating that any of the apps had been scientifically evaluated.
Discussion
Principal Findings
This review demonstrates the paucity of high-quality apps that are commercially available to support self-management of postoperative pain for either adult or pediatric users. All included apps were designed exclusively for the Android platform. Education was the most common self-management feature offered (8/10, 80%), while none of the apps offered features related to goal setting or social support. Overall, no single app was comprehensive in terms of pain self-management content. Five (5/10, 50%) apps reported the involvement of a health care provider in their development. However, not a single app involved end users in their development and none of the apps underwent scientific evaluation. Additionally, none of the apps were designed for use in pediatric patients.
Customer ratings for the apps were moderate on average (mean 3.6, standard deviation 1.1). However, it is important to highlight that very few users chose to provide an app rating. For instance, while Pocket Physio reported between 5000 and 10,000 installs, only 86 users provided a rating (0.86-1.7%). No ratings, or less than the required minimum of 2 ratings, were provided for 30% (3/10) of the apps. All of the identified apps were designed exclusively for Android devices with no interoperability for iOS and Windows devices. This finding is in contrast to the 2015 systematic review of generic pain apps, where the majority of identified apps were designed for the iOS platform [15].
The adequacy of existing apps can be assessed relative to recently published clinical practice guidelines for evidence-based management of postoperative pain across the life span [23]. Relevant recommendations include the delivery of individually tailored preoperative education and perioperative pain management planning, the use of validated pain assessment tools to track response to pain interventions and inform treatment adjustments as needed, as well as the use of evidence-based, nonpharmacological pain management (eg, cognitive behavioral strategies, physical modalities) in conjunction with indicated pharmacological modalities [23]. Compared against these guidelines, none of the reviewed apps uniquely fulfill all recommended criteria of education (surgery and pain), symptom self-management, and pain self-management strategies. Furthermore, none of the apps offer the ability to prespecify a postoperative pain management plan or to consider the relevance of managing presurgical pain to postsurgical outcomes.
A complex myriad of surgical, psychological, socioenvironmental, and patient-related risk factors have been shown to influence postsurgical pain experience [24]. Pre- and postsurgical psychological factors associated with increased pain include anxiety, depression, low self-efficacy, and the tendency to catastrophize about pain [24-26]. Recent reviews and meta-analyses identify psychological treatments delivered preoperatively, postoperatively, or both, to effectively reduce postoperative pain [23,27]. Many of these strategies, such as distraction, relaxation, and guided imagery techniques, can be easily delivered via mHealth platforms. The ability of self-management apps to target psychosocial risk factors is plausible, given existing evidence supporting the use of smartphones to effectively deliver interventions to reduce symptoms of anxiety and depression [28], particularly when strategies are available in the moment when people are engaged in their everyday lives [29].
Despite the focus of many apps on physical strategies in recovery from surgery, none included goal setting. Goal setting is a critical function in smartphone apps targeting increased physical activity [30]. In addition to increasing risk for postsurgical pain, depression, anxiety, and low self-efficacy are also identified as barriers to adherence to physiotherapy treatment [31]. Apps that are designed to pair psychological and physical pain self-management strategies with goal setting may be particularly effective for reducing pain and enhancing postsurgical outcomes.
Concurring with the findings of earlier app reviews [13,15,32], this study demonstrates that existing postoperative pain apps lack empirical evidence of evaluation. This finding continues to raise concerns about the trustworthiness and effectiveness of commercially available apps for helping individuals to manage their postoperative pain. In contrast to previous reviews, 50% (5/10) of the identified postoperative pain apps reported inclusion of a health care provider in their development. While this is a positive development, it would be informative for app developers to more explicitly describe the nature of provider input.
Moreover, none of the apps explicitly involved end users (people with postoperative pain) in their development. It has been recommended that patient-focused apps be developed as per a user-centered design (UCD) approach [33]. UCD is “characterized by a focus on the user, and on incorporating the user’s perspective in all stages of the design process” [34]. Application of UCD has been associated with improved user acceptance, satisfaction, and engagement [35]. Given the limitations of existing apps, it is important that future app development to support postoperative pain management adopt the UCD principles.
Limitations
Given that the Web-based app searches were conducted within Canada, the results reflect the Canadian app marketplace. Due to the geographic search restrictions of the online app stores, this limitation also applies to other published app reviews (eg, Rosser and Eccleston [13] and Reynoldson et al [14] focused on the United Kingdom; Lalloo et al [15] focused on Canada). Thus, there may be differences in the commercially available postoperative pain apps in other countries. Additionally, while the Google Play Store (which contained all included apps) allows users to rate their app experience, their 1 to 5 scale does not have defined anchors. This lack of definition limits our ability to interpret the factors that are driving customer ratings. Furthermore, since app customers are not required to provide ratings, there is a high frequency of missing rating data in comparison with the reported number of installs.
Conclusions
Currently available postoperative pain apps are characterized by a lack of evidence-based content, goal setting, and social support functions and are not targeted to pediatric users. There is a need to develop and evaluate comprehensive, theory-based apps to better support patients with pain self-management care following surgery.
Abbreviations
- mHealth
mobile health
- PRISMA
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- UCD
user-centered design
Footnotes
Conflicts of Interest: Authors CL, KAB, JNS, and FC conduct mHealth research and are involved in the development of pain self-management apps. These apps are described at the websites of PainQuILT (an evidence-based pain assessment and tracking tool for people with chronic pain) and the Improving Outcomes in Child Health through Technology (iOUCH) lab, a part of the Child Health Evaluative Sciences (CHES) research program at The Hospital for Sick Children in Toronto, Ontario.
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