## 1 Introduction
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Canes**} \\ \hline
**Reference** & **Technology** & **Methods** & **Results** & **Limitation** & **Year** \\ \hline
[16] & Cane & \begin{tabular}{c} A Force sensor was \\ attached to measure \\ the load on the cane. \\ Laser range finders \\ were used to detect the \\ user’s leg motion. \\ \end{tabular} & \
\begin{tabular}{c} Continuously \\ measurement using \\ weight bearing \\ during walking \\ Spatiotemporal gait \\ were \\ Spatiotemporal gait \\ were used to detect the \\ were’s leg motion. \\ \end{tabular} &
\begin{tabular}{c} No temporal-spatial gait \\ parameters were \\ estimated in this study. \\ \end{tabular} & 2019 \\
[22] & Cane Robot & \begin{tabular}{c} \\ \end{tabular} & \
\begin{tabular}{c} Laser range finders \\ were used to detect the \\ parameters \\ were measured \\ \end{tabular} &
\begin{tabular}{c} Spatiotemporal gait \\ tight pants or short skirts \\ during monitoring. \\ \end{tabular} & 2022 \\ \hline
**Wheeled Walkers** & \multicolumn{4}{c}{**Wheeled Walkers**} \\ \hline
**Reference** & **Technology** & **Method** & **Results** & **Limitation** & **Year** \\ \hline
[14] & i-Walker Platform & \begin{tabular}{c} Force sensors were \\ embedded on \\ handlebars of \\ the walker. \\ \end{tabular} & \
\begin{tabular}{c} Extracted \\ spatiotemporal \\ spatiotemporal \\ gait parameters. \\ \end{tabular} &
\begin{tabular}{c} The user needed to put a \\ mass of at least 3 kg on the \\ walker handlebars for use \\ \end{tabular} & 2015 \\
[23] & Smart Walker & \begin{tabular}{c} Gait monitoring by \\ using feet position and \\ orientation by using \\ ISIR’s smart walker \\ prototype with Active \\ depth sensor. \\ \end{tabular} & \
\begin{tabular}{c} Spatial patterns are \\ reported in this study \\ by using a camera \\ depth sensor \\ without markers. \\ \end{tabular} &
\begin{tabular}{c} Spatiotemporal \\ parameters were not \\ reported in this study. \\ \end{tabular} & 2015 \\
[24] & Wheeled Walker & \begin{tabular}{c} Microwave Doppler \\ radars are embedded \\ in the four wheels of \\ the walker. \\ \end{tabular} & \
\begin{tabular}{c} Gait velocity \\ estimation for normal \\ and abnormal gait. \\ \end{tabular} &
\begin{tabular}{c} Important gait parameters \\ for diagnosis of the user’s \\ condition are not the \\ scope of this study for \\ instance cadence, step \\ length, etc. \\ \end{tabular} \\
[18] & i-Walker Platform & \begin{tabular}{c} Embedded force \\ sensors in handlebars \\ of the walker. \\ \end{tabular} & \
\begin{tabular}{c} Estimated force \\ difference of \\ handlebar sensors \\ during walking \\ \end{tabular} &
\begin{tabular}{c} Estimated force \\ optrack system and a \\ treadmill, so it needed a \\ confined environment \\ for operation. \\ \end{tabular} \\
[25] & Smart Walker & \begin{tabular}{c} Data of volunteers \\ using a smart rollator \\ based on a force \\ sensor, an \\ accelerometer, and a \\ gyroscope was \\ classified using \\ machine learning. \\ \end{tabular} & \
\begin{tabular}{c} Found distinct \\ walking-age groups \\ according to walking \\ speed, the forces \\ exerted by the \\ individual on the \\ i-Walker. \\ \end{tabular} &
\begin{tabular}{c} For assessment only two \\ parameters were known \\ in.e., walking speed \\ and force. \\ \end{tabular} \\
[26] & Smart Walker & \
\begin{tabular}{c} The gait parameters \\ determined by smart \\ walker and GaitRite \\ were concurrently \\ with gait monitoring. \\ \end{tabular} &
\begin{tabular}{c} This walker only \\ determined temporal gait \\ parameters and extraction \\ of spatial gait parameters \\ are not in the scope of \\ this system. \\ The main draw of this \\ device was that it needed \\ users’ leg visibility during \\ rollator use due to a \\ laser-based gait analysis \\ system. Walk-IT also \\ encountered visibility \\ issues when it came to \\ tracking steps, a crucial \\ element for \\ gait assessment. \\ \end{tabular} & 2019 \\
[27] & Smart Rollator & \begin{tabular}{c} Open-source \\ modular-based rollator \\ for gait monitoring \\ and support. It \\ included force sensors, \\ encoders in the wheel, \\ and light detection \\ and ranging sensors. \\ \end{tabular} & \
\begin{tabular}{c} Assessment of \\ spatiotemporal gait \\ parameters by leg \\ speed information and \\ weight bearing \\ of users. \\ \end{tabular} &
\begin{tabular}{c} No temporal-spatial gait \\ parameters were \\ estimated in this study. \\ \end{tabular} \\
[22] & Smart Rollator & \
\begin{tabular}{c} Assetment of \\ rollator use due to a \\ laser-based gait analysis \\ system. Walk-IT also \\ received visibility \\ issues when it came to \\ tracking steps, a crucial \\ element for \\ gait assessment. \\ \end{tabular} &
\begin{tabular}{c} Assessment of \\ rollator use due to a \\ laser-based gait analysis \\ system. Walk-IT also \\ encountered visibility \\ issues when it came to \\ tracking steps, a crucial \\ element for \\ gait assessment. \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}