Joint-replacement recovery used to go dark the moment a patient left the surgical centre. A printed sheet of exercises was the only guidance sent home with them, and the next scheduled contact was the six-week review, an enormous window in which a patient could be recovering well, quietly falling behind, or moving the wrong way, and nobody at the centre would know which.

Care teams tried to close the gap the only way they had: routine reassurance calls. But those calls were not targeted, so staff time went into checking on patients who were recovering fine just as often as it reached the ones who were struggling. The patients most at risk of falling behind were exactly the ones a blanket calling schedule was least likely to catch in time.

Across the 25 partner surgical centres piloting the programme, this pattern repeated at scale: printed sheets, a six-week blind spot, and clinic staff spending hours on calls that could not tell them who actually needed to hear from them.

We built iOS and Android companion apps paired directly with the patient's own smartwatch, replacing the printed exercise sheet with a day-by-day recovery plan. Step goals, guided exercise videos and pain and symptom check-ins gave patients a clear, structured routine to follow from the day they left the surgical centre, rather than a single sheet of instructions to interpret alone.

Step counts sync automatically from the watch, so the app captures real movement data without asking the patient to log anything by hand. That data feeds a clinician dashboard that flags patients falling behind their expected recovery curve, turning the six-week blind spot into a picture care teams can check daily across all 25 partner centres.

The dashboard changed how reassurance calls worked in practice. Instead of calling every patient on a fixed schedule, care teams could call the ones the data actually flagged as falling behind, so staff time went where it was needed rather than being spread evenly across everyone.