Table 2. Methods and results of papers included in review.

Paper	Equipment and balance analysis	Type of insole	Results
1	Force plate	Quick-comfort insole	Prefabricated insoles improve postural stability, global stability and proprioception.
2	Force plate	Soft gel insole and hard insole	Soft and hard insoles lead to significant improvements in postural sway.
3	Force plate	Textured insole	Textured insoles reduce postural sway of older individuals, especially during more challenging balance tasks.
4	Force plate and EMG	Textured insole	Textured insoles reduce mediolateral sway of healthy elderly individuals.
5	Force plate	Vibrating insole	Vibrating insoles improve balance, especially in the anteroposterior direction.Postural stability was not significantly increased with the use of vibrating insoles.
6	Force plate	Insole with wedge + set-up sensors	Improved balance and symmetry
7	Force plate and EMG	Textured insole	Textured surfaces do not affect control of bipedal static postural sway or lower limb muscle activity
8	Force plate	Vibrating insole	Both groups (control and neuropathy) showed significant effects and the displacement velocity of center of pressure was improved in the anteroposterior direction
9	Force plate	Insole with spikes	Spiked insoles improve postural control.
10	Gait disturbance protocol	Balance enhancing insole	Balance-enhancing insoles constitute a viable strategy for improving balance control.
11	Force plate	Flat insoles with different Shore A (15° or 30°)	Insole rigidity exerts no influence on balance.
12	Electronic version of Romberg test + camera based on motion analysis system	Vibrating insoles	Vibrating insoles assist in improving balance control in patients with diabetes and stroke victims.