본 연구의 목적은 만성족부불안정성과 발목염좌 과거력이 있는 유소년 축구선수들 30명을 대상으로 등속성 근력과 균형성을 분석하는데 있다. 피험자는 3그룹으로 정상그룹(CG:연령=17.78±1.98years, 체중=68.25±5.35kg, 신장=174.90±4.28cm), 만성족부불안정성 그룹(CIG: 연령=17.78±1.98years, 체중=72.40±6.16kg, 신장=177.44±3.90cm)과 과거력을 가진 발목염좌 그룹(HSG: 연령=17.10±2.42years, 체중=73.51±4.73kg, 신장=176.90±2.72cm)으로 분류 하였다. 측정은 족관절 근력(배측굴곡, 족저굴곡, 내번, 외번), 슬관절 근력(굴곡과 신전)과 평형성을 측정하였다. 결과에서는 CIG & HSG, CIG & CG에서 족저굴곡 30º/sec (체중댱최대우력: p<.001; 파워; p<.001), 족저굴곡 120º/sec(체중당최대우력, p<.041), 내번 30º/sec (체중당최대우력: p<.007; 파워, p<.036). 결론적으로 만성족부불안정의 원인은 내번 근육과 족저굴곡 근육의 약화로 인하여 복합적으로 발생된다. 따라서 만성족부불안정에 대한 재활프로그램과 예방의 목적으로 발목 강화훈련이 강조되어야 한다.

Objective: To examine if patients with chronic ankle instability or a history of ankle sprains without chronic instability have worse isokinetic strength and less balance. Design and Setting: We assessed isokinetic strength and balance on the Cybex isokinetic dynamometer. Subjects: Subjects included 30at the high school soccer players. Their ankles groups were divided into 3 groups: a symptom free control group(CG), subjects with chronic ankle instability group(CIG), subjects who had sustained an ankle sprain in the last 2years without instability(HSG)(men, CG: age=17.78±1.98years, weight=68.25±5.35kg, height=174.90±4.28cm; CIG: age=17.78±1.98years, weight=72.40±6.16kg, height=177.44±3.90cm; HIG: age=17.10±2.42years, weight=73.51±4.73kg, height=176.90±2.72cm). Measurements: assessed at the knee and ankle, and isokinetic peak torque was determined for extension, flextion at the knee and ankle dorsiflexion, plantarflexion, inversion, eversion at the ankle. Results: from the three groups have shown that were significant differences between two groups in CIG & HSG, CIG & CG PF 30º/sec (peak torque%body: p<.001; power, p<.001), PF 120º/sec (peak torque%body, p<.041), IV 30º/sec (peak torque%body: p<.007; power, p<.036). Conclusions: We suggest that the possible cause of chronic ankle instability is a combination of diminished inversion, eversion muscle and plantar flexion muscle weakness. There, we emphasize ankle strength training in the rehabilitation program for chronic ankle instability.