Inclusion criteria	Exclusion criteria
1. Studies comparing diabetic patients with and without neuropathy (DPN and DC groups)	1. Studies included current or past diabetes foot ulcer participants as a part of their DPN or DC groups
2. Observational studies in the English language	2. Studies performed on a treadmill or the walking speed is imposed
3. Studies reported outcomes for at least one of the following: gait velocity, stride length, stride time, stance time, range of motion (RoM) in the sagittal plane of the knee joint, and the maximum knee extension moment.	3. Studies in which the outcomes cannot be compared or the key data are unmentioned
4. The classification of participants is based on the objective diagnostic criteria	4. Studies performed on uneven or obstacle roads