Abstract
Gait studies were performed on 13 children with mental retardation between the ages of 4 and 18 years. Walking speed; step length, and step length/shin length ratio; duration of stance and double-limb stance (as percentage of the gait cycle); and rotations of the lower-extremity joints in the sagittal plane were analyzed throuout a walking cycle, and were evaluated. 8 subjects were diagnosed as a group of the abnormal gait, and their patterns of the sagittal-plane angular rotations were similar to those of normal infants. Most of the group remained whithin the 2nd year in mental development, and the rest, who were over the 2nd year, had overt motor disorders.
