• Title/Summary/Keyword: Subtalar joint axis

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Biomechanical Characteristics of Comprehensive Ankle Joint Complex between Chronic Ankle Instability (CAI) and Healthy Control (만성 발목 불안정성(CAI) 환자와 건강 대조군 간 종합적 발목관절복합체의 생체역학적 특성)

  • Kim, Byong Hun;Jeong, Hee Seong;Lee, Inje;Jeon, Hyung Gyu;Lee, Sae Yong
    • Korean Journal of Sport Biomechanics
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    • v.31 no.3
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    • pp.168-175
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    • 2021
  • Objective: To investigate the static and dynamic analysis of ankle joint complex between subjects with chronic ankle instability (CAI) and healthy controls. Method: A total of 38 subjects and CAI group (N=19) and healthy control (N=19) participated in this first study. Variables that were measured in this study were as follows: 1) Subtalar joint axis inclination and deviation 2) Rearfoot angle 3) Navicular drop test 4) Heel alignment view in alignment analysis. Intra Correlation Coefficient (ICC) is used for reliability. A secondary 17 subjects are recruited including 9 of CAI and healthy for gait analysis between group. Lower extremity sagittal, frontal, and transverse kinematics were measured. All data were analyzed to ensemble curve analysis. Results: 1) There were statistically significant differences in standing rearfoot, navicular drop, heel alignment view, subtalar joint (STJ) inclination and deviation. 2) Only in sagittal, meaningful difference is showed during walking in gait analysis. Conclusion: Morphological problem can affect ankle sprain in aspect of structure with no relation to compensation of neuromuscular.

The Structural Characteristics of the Ankle Joint Complex and Declination of the Subtalar Joint Rotation Axis between Chronic Ankle Instability (CAI) Patients and Healthy Control (만성 발목 불안정성(CAI) 환자와 건강 대조군 간의 발목 관절 복합체 구조적 특징과 목말밑 관절 회전 축 기울기)

  • Kim, Chang Young;Ryu, Ji Hye;Kang, Tae Kyu;Kim, Byong Hun;Lee, Sung Cheol;Lee, Sae Yong
    • Korean Journal of Sport Biomechanics
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    • v.29 no.2
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    • pp.61-70
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    • 2019
  • Objective: This study aimed to investigate the characteristics of the declination of the subtalar joint rotation axis and the structural features of the ankle joint complex such as rear-foot angle alignment and ligament laxity test between chronic ankle instability (CAI) patients and healthy control. Method: A total of 76 subjects and CAI group (N=38, age: $23.11{\pm}7.63yrs$, height: $165.67{\pm}9.54cm$, weight: $60.13{\pm}11.71kg$) and healthy control (N=38, age: $23.55{\pm}7.03yrs$, height: $167.92{\pm}9.22cm$, weight: $64.58{\pm}13.40kg$) participated in this study. Results: The declination of the subtalar joint rotation axis of the CAI group was statistically different from healthy control in both sagittal slope and transverse slope. The rear-foot angle of CAI group was different from a healthy control. Compared to healthy control, they had the structure of rear-foot varus that could have a high occurrence rate of ankle varus sprain. CAI group had loose ATFL and CFL compared to the healthy control. Conclusion: The results of this study showed that the deviation of the subtalar joint rotation axis and the structural features of the ankle joint complex were different between the CAI group and the healthy control and this difference is a meaningful factor in the occurrence of lateral ankle sprains.