Biomechanical analysis of an inciting event of ankle sprain on basketball players
© Castro et al; licensee BioMed Central Ltd. 2008
Published: 26 September 2008
Lateral ankle sprains are very common among basketball players and are responsible for great time lost in practice. Nevertheless, having the same exposure to risk by playing basketball, some athletes never sprain their ankles while others do. The aim of this study is to understand the main kinematics an electromyography differences in basketball players during the dynamic activity that causes more sprained ankles in basketball: jump to unstable surface.
Data was analyzed in four phases of movement: prepare to jump, push-off; ascending flying and descending flying that culminate on the contact moment.
Knee and ankle angles on landing (deg)
17,49 ± 12,52
14,63 ± 10,77
p < 0,05
Ankle planta flexion
-3,38 ± 10,04
-9,75 ± 14,18
p < 0,01
Although differences on landing moment are far more obvious for the ankle, they also become visible for knee flexion. Healthy subjects showed more knee flexion and less ankle plantar flexion on contact which gives them a better arrangement for lower limb impact absorption and creates a safer position for ankle load. They also showed lower muscle activity for all muscles with exception of TA which contraction is significantly different on both groups on landing.
This study identified different movement behaviour for the lower leg of healthy versus previous sprained ankles during the jump, which could possibly prevent the athlete from preparing for contact and supporting moment, leading to an ankle sprain, especially because of an ankle position in greater risk. Healthy athletes take more time preparing lower limb for contact moment and further load. These findings also suggest that healthy athletes manage to arrange a better position for lower limb to land, which may be a sign that there might be necessary to train athletes' jumps in "safe positions" in order to prevent ankle sprains.
Authors would like thank Prof. Gil Pascoal & IDP & PRODEP.
This article is published under license to BioMed Central Ltd.