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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(5):1129-1135.
Changes of Gait Patterns by the Ankle Foot Orthoses with a Variable Ankle Joint Stop.
Park, Jun Min , Choi, Kyoung Hyo , Chun, Min Ho
Department of Rehabilitation Medicine, Asan Medical Center, University of Ulsan, College of Medicine.
단하지 보조기의 족관절 각도에 따른 보행 양상의 변화
박준민, 최경효, 전민호
울산대학교 의과대학 서울중앙병원 재활의학과
Abstract

Objective
To investigate the changes of gait patterns in subjects who use the ankle foot orthoses (AFOs) with a variable ankle joint stop.


Method
Six young subjects without a known physical disability were involved in this study. Double upright AFOs with three kinds of ankle joint stops (eg. AFOs with 85o posterior stop, 90o posterior stop, and 95o posterior stop) were used for the right foot and a rigid shoe was used for the left foot. Gait patterns of the subjects using the AFOs with a variable ankle joint stop were evaluated with the three dimensional gait analysis system.


Results
The gait patterns of the subjects with a 85o posterior stop AFO showed a shorter duration of single support phase than the subjects with a 90o posterior stop or 95o posterior stop. They showed the increased maximal knee flexion angles, decreased knee extension angles and decreased ankle range of motions by the kinematics. These linear changes in parameters and kinematics were statistically significant. In kinetics, the gait patterns of the subjects using a AFO with 85o posterior stop had the largest maximal knee flexion moment and the gait patterns of the subjects using a AFO with 95o posterior stop had the largest maximal knee extension moment. However these results were not statistically significant.


Conclusion
For the patients with uncontrolled ankle motion, the AFOs with 90o or 95o posterior stop would be more desirable than the AFOs with 85o posterior stop, for the clearance of foot and stability of knees but not for the correction of the knee hyperextension.

Key Words: Variable ankle joint stop, Ankle foot orthoses, Variable ankle joint stop, Gait analysis


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