  The increase in world elderly population has significantly underlined the
need for continuous health care measurement, specifically in rehabilitation
monitoring. The new technologies has enabled people to have in home healthcare
services, meanwhile, motion analysis methods are widely used for human activity
monitoring as a remote healthcare service. Wearable sensors have indicated
promising results both in convenience and technical performance. These sensors
are extensively used in human motion analysis and advancement of wireless
communications has intensively contributed to this field. Exploiting wireless
technology and wearable sensors contributes to more effective help in emergency
cases and has significantly decreased the hospitalization time. This paper
reviews the most recent advances in wearable sensors used in motion analysis,
specifically in the field of rehabilitation. Firstly, common wearable sensor
technologies are introduced and then wearable sensors deploying Carbon Nano
Tubes (CNT) are specifically reviewed. The next section is dedicated to sensor
fusion in which possibility and performance of integration of new technologies
are reviewed. This technique has been widely exploited to bring forth certainty
in clinical results. Lastly, the challenges and future possibilities for
advancement in motion analysis sensors is discussed.
