# A Systematic Review of Insole Sensor Technology: Recent Studies and Future Directions
## 3 Results  
### Overview of Research Articles on \"Sensorized\" Insoles  
The results of this study are presented in Table 2. The classification of works includes eight columns encompassing the author's name, the article's nature, the research's main focus, the equipment used within the study, the type and number of sensors, and whether they use wireless technology. According to the information provided in the table above (Table 2), we present in the following figure (Figure 7) some insole-based systems that were utilized in various works. We chose four commercial designs because there was more information available regarding that equipment, while there was little information about some of the prototypes and the designs elaborated on the works referred previously. The dates mentioned in the following figure represent the year that each work was produced and published. Figure 7: Development map of smart insole-like devices with representative systems design. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Study/Work** & **Year of** & **Type of** & **Polecment** & **Focus of Study** & **Equipment** & **Types of Sensors** & **Number of Sensors in Inside** & **Wireless** & **Number of Articles** \\ \hline
[8] & 2022 & Research article & Monitoring of forces applied to the tibial bone & Shoes and involes & Inertial measurement unit (IMU) and pressure sensors & ND* & Y & 49 \\ \hline
[9] & 2022 & Research article & Validation of pressure-sensing involes in patients with Parkinson’s disease & Inslogs & IMU and pressure sensors & 6-axis IMU; 18 & Y & 42 \\ \hline
[10] & 2021 & Research article & Gait analysis using smart involes in elderly people & Inslogs & IMU and pressure sensors & 6-axis IMU; 16 & Y & 54 \\ \hline
[11] & 2022 & Research article & Real-time gait event detection/foot angular kinematics with IMU & Plastic plates & IMU and pressure sensors &
\begin{tabular}{c} tri-axial accelerometer, tri-axial \\ gyroscope, and tri-axial \\ magnetometer, Pedar-X, Novel, \\ DE with 99 each \\ \end{tabular} & N & 31 \\ \hline
[12] & 2023 & Research article & Estimation and analysis of human gait & Inslogs & IMUs and pressure sensors &
\begin{tabular}{c} Sensor node-3-axis \\ accelerometer and gyroscope, \\ \(8\) each \\ \end{tabular} & N & 13 \\ \hline
[13] & 2016 & Research article & Analysis of gait in fallers and non-fallers in the elderly population & Bands, belt, and & Bands, belt, and &
\begin{tabular}{c} Tri-axial accelerometers at the \\ head, pelvis, and let and right angles \\ shanks; pressure-sensing \\ insoles (F-Scan 3000, Tkles, \\ Motor, MA, USA) with \\ \end{tabular} & N & 46 \\ \hline
[14] & 2021 & Research article & \
\begin{tabular}{c} Collecting and \\ monitoring plantar \\ pressure \\ \end{tabular} & Inslogs & Piezoresistive sensors &
\begin{tabular}{c} 6 textile piezoresistive sensors \\ (TPRS) each \\ \end{tabular} & ND* & 38 \\ \hline
[15] & 2020 & Review article & Gait phase detection in lower limb prostheses & ND* & \
\begin{tabular}{c} IMU, pressure sensors, \\ ground reaction force (GRF) \\ sensor, angular sensors, and \\ force sensors (PSs) \\ \end{tabular} &
\begin{tabular}{c} Force-sensing resistors (PSRs), \\ force sensors such as \\ forosovitches and foot pressure \\ inslogs \\ \end{tabular} & Y/N & 98 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Summary of the focus of each work, the equipment utilized, the types of sensors studied, the number of sensors in the inside, and the option of the wireless parameter considered for this systematic review.