Measurement of Muscle Strength of Ankle Joint Using Isokinetic Dynamometer in Normal Korean Adults
Journal of Korean Foot and Ankle Society
같은 인대 구조물들에 의해 유지되고 있으며, 이 외에도 장 비골 건(peroneus longus tendon)과 단 비골건이 동적 구조물(dynamic stabilizer)로서 발목관절에 기능적 안정성(functional stability)을 부 여하고 있다. 만성 발목 불안정증의 원인 인자로는 외측 인대 구조 물의 손상에 따른 해부학적 불안정성 이외에도 발목관절 주변의 고유 수용감각(proprioception)의 저하, 비골근의 약화(weakness), 비골근의 반응속도 저하(prolonged reaction time) 등이 관여하는 것으로 알려져 있다. 1-4) 따라서 발목관절 외측 인대 손상 후의 보존 적 치료 및 만성 불안정증에 대한 수술 후의 재활치료에서 비골근 력의 강화를 통한 기능적 안정성의 회복은 만족스러운 임상 결과 서 론 발목관절의 외측 안전성은 전 거비인대(anterior talofibualr ligament), 종비인대(calcaneofibualr
... caneofibualr ligament), 후 거비인대(posterior talofibualr ligament), 원위 경비골간 인대복합체(syndesmosis)와 Original Article CC This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Purpose: Restoration of ankle stability through the strengthening exercise of peroneus muscles is considered an important factor for achievement of successful outcomes, in the rehabilitation program following ankle ligament injuries. However, there were few definitive data on normal muscle strength, including eversion power by peroneus muscles. This study was conducted to evaluate the muscle strength of ankle joint measured using an isokinetic dynamometer in normal Koreans. Materials and Methods: Sixty adults (120 ankles) were recruited and divided into three groups (20 in their twenties, 20 in thirties, and 20 in forties). Each group consisted of 10 males and 10 females. The selection criteria were no history of ankle injury and no evidence of instability. The peak torque, total work, and deficit ratio were measured using the Biodex TM (Biodex Medical Systems). Differences in muscle strength by age, gender and dominant versus non-dominant side were analyzed. Results : The peak torque of dorsiflexion was average 31.5 Nm at 30 o /s of angular velocity and 18.8 Nm at 90 o /s; average 69.3 Nm (30 o /s) and 42.4 Nm (90 o /s) on plantarflexion; average 19.6 Nm (30 o /s) and 10.8 Nm (90 o /s) on inversion; average 12.9 Nm (30 o /s) and 8.0 Nm (90 o /s) on eversion. The deficit ratio of strength in women was average 61.1% of men on dorsiflexion; average 66.2% on plantarflexion; average 48.5% on inversion; average 55.4% on eversion. The deficit ratio in non-dominant foot was average 88.6% of dominant foot on dorsiflexion; average 90.1% on plantarflexion; average 85.1% on inversion; average 85.6% on eversion. Conclusion: The muscle strength of the ankle joint showed a tendency to weaken with age. There were significant differences in muscle strength by gender and dominancy. Further studies for comparison of patients with ankle instability, a comparison between before and after surgery for instability, the correlation between clinical outcomes and the recovery in muscle strength will be needed.