Biomechanical characteristics of the patients with functional ankle instability when landing on the slope

doi:10.3969/j.issn.2095-4344.0355

Abstract

Abstract:

BACKGROUND: Leaping maintains the correct arrangement and stability of joint by closed-loop (neural control after landing) and open loop control (neural control before landing). The stabilization mechanism of the ankle feedback is poor in functional ankle instability (FAI) patients. However, the characteristics of the nerve reaction in FAI patients are still unclear.

OBJECTIVE: To explore the ankle joint kinematics of the FAI patients landing on the slope and the electromyographic activation of the relevant muscle, so as to reveal the nerve response mechanism of the FAI patients who cannot recover the proper posture through the muscles surrounding ankle joint.

METHODS: Eleven unilateral FAI patients and 11 healthy female participants with similar age were recruited. The motion capture and surface electromyography test system were conducted synchronously. The kinematics and myoelectric parameters at 200 ms before and after landing on the slope were collected using relevant software, and statistical analysis was performed on SPSS 17.0 software.

RESULTS AND CONCLUSION: (1) The activation of gastrocnemius of the affected side in the FAI patients before landing was significantly higher than that of the healthy side (P < 0.05), and there was no significant difference in the anterior tibial muscle, peroneus longus and soleus muscles between sides (P > 0.05). The average sagittal plane plantar flexion of the affected side was significantly higher than that of the healthy side (P < 0.05), and other angles were insigificantly different between sides (P > 0.05). (2) The activation of peroneus longus of the affected side in the FAI patients after landing was significantly lower than that of the healthy side (P < 0.05), and there was no significant difference in the anterior tibial muscle, gastrocnemius and soleus muscles between sides (P > 0.05). The kinematics parameters after landing showed no significant differences between sides (P > 0.05). (3) The activation of peroneus longus of the affected side in the FAI patients before landing was significantly higher than that of the two sides in healthy controls (P < 0.05), and there was no significant difference in the anterior tibial muscle, gastrocnemius and soleus muscles between groups (P > 0.05). The activation of the four muscles after landing showed no significant difference between two groups (P > 0.05). (4) The angles of the bilateral joints before and after landing did not differ significantly between two groups (P > 0.05). (5) In summary, neither open nor closed loop mechanism is conducive to the landing on the slope, and the difference is insignificant between FAI and healthy people. Therefore, the assessment protocol on motion control based on open-loop neural mechanism needs to be further studied and developed.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Ankle Joint, Electromyography, Tissue Engineering

CLC Number:

R318

Song Fa-ming, Wang Chun. Biomechanical characteristics of the patients with functional ankle instability when landing on the slope[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(27): 4380-4386.

Figures/Tables 4

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