The use of wearable sensors has made it possible to have
the necessary treatment at home for patients after an attack of
diseases such as heart-attacks, sleep apnea, Parkinson disease
and so on [10]–[12]. Patients after an operation usually go
through the recovery/rehabilitation process where they follow
a strict routine. All the physiological signals as well as
physical activities of the patient are possible to be monitored
with the help of wearable sensors. During the rehabilitation
stage the wearable sensors may provide audio feedback, virtual
reality images and other rehabilitative services. The system can
be tuned to the requirement of individual patient. The whole
activity can be monitored remotely by doctors, nurses or
caregivers [13].