A patient may walk well for six meters in a clinic and struggle for the rest of the week at home.
More days, messier data
Wearables record steps, pace, pauses, and asymmetry across ordinary routines. That wider window can make recovery visible earlier.
What counts as improvement
The sensor output has to connect with outcomes that patients and clinicians value: fewer falls, less fatigue, or more independence.
Equity in the signal
Battery life, comfort, phone access, and household routines all shape the data. Trials must treat missing data as a design issue, not an afterthought.
