Lessons and limitations
Digital health coaching was able to successfully deliver remote health behaviour support to participants preoperatively with high levels of patient-reported satisfaction. We demonstrated statistically significant improvements in PAM levels, indicating positive changes in participants’ confidence, knowledge and skills to manage their own health needs. Participants who had the lowest PAM scores on entering the programme (non-activated) had a greater increase in their PAM score compared with the group as a whole, with 71% of this group moving to an activated group on programme completion. No patients remained in the highest risk category (group 1) on completion of the programme. This is an important finding given the correlation with adverse health outcomes in people who undergo surgery in a non-activated state. This improvement is in line with improvements seen in PAM after prehabilitation for cancer treatment.35
Our participants demonstrated a statistically significant increase in resistance training and small non-statistically significant improvements in their other health behaviours throughout the programme, particularly relating to aerobic activity and alcohol consumption. Enhanced recovery and prehabilitation programmes have previously demonstrated that a combination of small changes can lead to significant improvements in overall outcomes often termed ‘aggregation of marginal gains’.36 In tandem with this, we would expect participants to have reported a higher functional capacity with a higher VO2max; however, the self-reported DASI scores on Exit from the programme did not support this. In rationalising this finding, we hypothesise that participants initially overestimated their functional capacity at Entry assessment, however, after undertaking a structured exercise programme completed a more accurate assessment of their functional capacity at Exit, leading to a reduction in DASI score. This possibility is supported by studies that have demonstrated discrepancies between physician and patient assessment of functional capacity where patients may tend to overestimate their physical capacity.37 There have also been reported limitations in using the DASI score to assess functional capacity.38 To overcome this limitation, it may be appropriate in future projects to measure functional capacity objectively as we did in our original face-to-face programme, where we observed clinically significant improvements in 6 min walk distances.7 With improvements in wearable digital technology this can be achieved remotely, although it is important to note there may be limitations in accuracy of measurements.39 Further research would be warranted to find a way to accurately measure functional capacity remotely.
Our outcomes also support the potential for healthcare savings in patients receiving digital health coaching compared with face-to-face or no support. Compared with our ‘control’ cohort of patients from the National Joint Registry (unmatched, demographics unknown), there was a 1-day reduction in LOS in those receiving digital health coaching. If scaled to all 1600 patients undergoing arthroplasty at the Trust annually, this would represent a potential cost saving of up to £437 000. With our earlier face-to-face prehabilitation delivery we observed a median LOS of 4 days (IQR 3–5) in arthroplasty patients, 2 days longer than participants in the current project.7 This finding, coupled with the higher cost of face-to-face prehabilitation delivery (£249 higher per patient for 8-week programme), would also represent a substantial potential cost saving if replicated at scale. It is important to note, however, that we acknowledge that there are many other factors which may affect the interpretation and applicability of these findings. The LOS comparison was not adjusted for potential confounding factors such as patient clinical risk status between the various groups for data we present here. The subsequent cost analysis also uses modelled data from these unmatched patient populations, including the exclusion of high-risk patients from the current project. These are two of several factors which may influence outcomes and skew LOS. We therefore cautiously present these results as having the ‘potential’ to generate healthcare savings.
The majority of patients (74%) (see figure 1) approached consented to being involved in a digital prehabilitation programme, which is consistent with other prehabilitation interventions.40 The digital health coaching participants were majority female (67.5%). In the participants who chose the alternative Targeted interactive computer-based programme, 46% were female. This may demonstrate a preference for digital health coaching in females. The digital health coaching participants were also younger (mean age 63 years) compared with those who chose the alternative computer-based offer (mean age 66.6 years). App-based digital interventions accessible through a mobile phone may therefore be more appealing to younger patients. This is consistent with outcomes from our institution’s Digital Joint School work where older patients preferred to access their programme on a larger computer screen.34 Older patients are at increased risk of digital exclusion, feeling less confident in using a mobile phone application to access healthcare. As healthcare moves forward with an increasing emphasis on digital delivery, we need to consider ways to educate and assist older people in using technology, such as paper user guides, and having family and friends to assist.28 Further work is needed to explore the barriers to participation in digital prehabilitation.
EQ-5D scores were relatively unchanged after the programme. Orthopaedic patients undergoing primary arthroplasty tend to have significant levels of pain as well as difficulties in mobility.41 We expected pain to continue or increase throughout the programme due to disease progression, which may have negatively affected the EQ-5D scores at Exit as well as physical activity levels throughout.42 With small participant numbers it is difficult to assess if pain has impacted the EQ-5D results, and further research would be required to identify if this is a significant component.
There are several limitations that are important to acknowledge from this work. The nature of the project as a quality improvement initiative meant that we had a relatively small sample size of patients from a single surgical specialty, with no matched control group. Although these factors mean our results need to be interpreted with a degree of caution, we believe our findings provide a useful addition to the literature, while providing important feasibility data for future projects to build on. We excluded high-risk patients as we deliberately chose a ‘safety first’ approach given the exploratory nature of the project. Despite this, we would expect similar if not greater improvements in higher risk patient populations. The fact that higher risk patient groups have lower levels of activation,18 and our observation that this group achieved greater benefits overall, is likely to support this interpretation. Expanding to higher risk groups in future is feasible with a high degree of assessment and monitoring to ensure patient safety. Patients consenting to digital health coaching may be more likely to be engaged with health optimisation and digital health compared with those who decline participation, a factor which may skew results. This would limit its implementation in a less engaged population. Patients without compatible smartphone devices were excluded from the programme, therefore usability for participants who are not digitally enabled was not assessed. Although we acknowledge the need to support patients who may be at risk of digital exclusion to avoid inequality of access, a full discussion of this topic is beyond the scope of this manuscript. Only 55% of participants who completed the programme provided written feedback regarding their experiences and satisfaction. This limits the identification of common themes to improve participant experience while using the app.
The programme was delivered by recruiting patients from the Tees Valley and North Yorkshire regions which represents a predominantly white British population demographic. Despite this, we would anticipate that digital health coaching could be successfully delivered in other geographical areas. This assessment is supported by the relatively successful uptake of the programme in the Tees Valley which has some of the highest levels of deprivation (and associated risk of digital exclusion) in England.5 The successful uptake in patients from North Yorkshire was also encouraging given the large geographical area of the county, making programmes like digital health coaching an ideal resource to support patients remotely while minimising travel inconvenience. Assessment of digital health coaching resources in non-English-speaking patients is a limitation of this work and will be a critical next step when resources are available.