Diabetic Foot/rehabilitation; Gait/physiology; Orthotic Devices; Pressure/adverse effects; Adolescent; Adult; Aged; Biomechanical Phenomena; Cohort Studies; Diabetes Complications/diagnosis; Diabetes Complications/rehabilitation; Diabetes Mellitus/diagnosis; Diabetes Mellitus/drug therapy; Diabetic Foot/etiology; Diabetic Foot/surgery; Equipment Design; Equipment Safety; Female; Follow-Up Studies; Humans; Male; Middle Aged; Postoperative Care; Probability; Sensitivity and Specificity; Severity of Illness Index; Shoes; Statistics, Nonparametric; Stress, Mechanical; Treatment Outcome; Vacuum; Weight-Bearing/physiology; Young Adult