Comparison on hinged ankle splint, elastic ankle splint and air-stirrup on lateral cutting movement and drop landing

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Comparison on hinged ankle splint, elastic ankle splint and air-stirrup on lateral cutting movement and drop landing

 

Author: Choy, Tak-shun
Title: Comparison on hinged ankle splint, elastic ankle splint and air-stirrup on lateral cutting movement and drop landing
Degree: M.Sc.
Year: 2008
Subject: Hong Kong Polytechnic University -- Dissertations.
Ankle -- Wounds and injuries -- Prevention.
Orthopedic apparatus.
Orthopedic braces.
Department: Dept. of Health Technology and Informatics
Pages: xii, 79 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2174120
URI: http://theses.lib.polyu.edu.hk/handle/200/1647
Abstract: Ankle sprain is a common injury in sports population. Sideward lateral cutting movement is common in various types of ball game and it increases the risk of ankle sprain. Using external appliance is a common method to reduce the frequency and severity of sprain ankle. Although restricted ankle motions help to prevent sprain ankle, an adverse effect was the decreased ability in shock absorption during drop landing. In order to understand the effectiveness of custom moulded hinged ankle brace, Aircast(R) Sport-Stirrup, and A60TM ankle brace in restricting excessive range of motion during a movement which sprains often occur, the purpose of the study was to determine the effect of designed ankle brace on lower limb kinematic and kinetic during lateral cutting movement and drop landing. Eleven normal male subjects (average age 32) and eight male subjects with history of ankle sprain (average age 32) were recruited in this study. The effect of wearing three types of ankle orthoses on lower limb kinematic and kinetic were investigated during soft drop landing, stiff drop landing and lateral cutting movement. A two-way ANOVA was used to analyse the effect of different ankle orthoses in sprained group and control group. In lateral cutting movement, wearing Hinged Ankle Brace presented a significant effect on reducing maximum foot inversion angle compared with no brace by 5.6o (p=0.000). A smaller foot inversion angle (p=0.006) at initial contact was found in subject wearing hinged ankle brace during lateral cutting movement. In soft drop landing, wearing Aircast(R) Sport-stirrup showed a significant effect on reducing plantarflexion angle at touch down by 5.4o (p=0.000), and a significantly smaller maximum dorsiflexion angle than no brace condition by 5.8o (p=0.000). Wearing Aircast(R) Sport-stirrup also turned out with a shorter time to reach the first and second vertical peak force than no brace condition in soft drop landing. In this study, subject with recurrent ankle sprain positioned the foot in a more plantarflexed and inverted posture at initial foot contact in lateral cutting movement. Larger plantarflexion angle at initial contact also occurred in sprained group during soft and stiff drop landing. As sprained group landed in a more plantarflexed and inverted foot posture, the risk of recurrent sprain ankle was increased. Custom moulded hinged ankle brace presented with inversion restriction to the foot might help relieve ankle joint ligament complex in case of excessive strain. Custom moulded hinged ankle brace and Aircast(R) Sport-stirrup also maintained the unloaded foot in a more neutral position during initial contact. Both braces should have provided some degree of protection by effectively restricting undesired ankle motion.

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