| Summary: | 碩士 === 中國醫藥大學 === 醫學研究所 === 93 === Ankle sprain is one of the most common sports injuries. About 14% - 17% of sports injury is ankle sprain, and there is a part of acute ankle sprain patient will remain prolonged functional instability (FI) . Functional ankle instability means that the ankle with normal structure but injured proprioception receptor induce functional problem, ex. recurrent ankle sprain.
Generally speaking, the symptoms of functional instability are balance deficits, joint position sense deficits, nerve conduction velocity slower, delayed peroneal muscle reaction time and strength deficits. So, functional instability may change properties of ankle biomechanics. Most of ankle injuries happen during landing, so it is an important moment of ankle sprain. By understanding the characteristic of landing will help us to find out the mechanism of ankle sprain. There are many factors will effect our lower extremity to absorb the impact during landing, such as landing position or strategy. Ankle tapping is one of the useful treatments of ankle sprain, the mechanism of ankle tapping which protect ankle by decreasing ankle range of motion (ROM), increasing proprioception input, increasing peroneal muscle activity and ankle motion deceleration.
The purpose of this study is to compare the ground reaction force (GRF) parameters between the patients with ankle functional instability and normal individuals during counter movement jumping and straddle jumping in order to evaluate the relationship between functional ankle instability and the loading of lower limbs. Besides, the effect of ankle tapping on the ground reaction force during landing was also evaluated in this study.
Fourteen subjects were recruited in this study. There are 7 subjects with functional ankle instability and the other 7 subjects are control group. The subjects were asked to perform counter movement jumping and straddle jumping in two conditions (with ankle tapping and without ankle tapping). Nineteen reflective markers were placed on the lower limbs of subjects. Vicon motion analysis system and two AMTI force plates were used to collect the trajectories of markers and ground reaction forces and moments in order to calculate the joint kinematics, joint forces and joint moments of lower limbs. Independent t test was used to compare the difference on the kinematic and kinetic parameters between FI group and normal group. Pair t test was used to evaluate the effect of ankle tapping.
The results showed that the impulses, joint forces and joint moments in lower limbs in FI group during landing were greater than that in control group. Ankle tapping is helpful to decrease the impulses, joint forces and joint moments during landing when subjects performed counter movement jumping and straddle jumping. The results also showed that the ankle tapping did not change the joint movement pattern and range of motion of lower limbs in counter movement jumping and straddle jumping movements.
|
|---|
