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《Journal of Forestry Engineering》 2018-01
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Biomechanical effect of mattress force and knee flexion angle on knee and hip joints in supine position

FANG Fei;SHEN Liming;CHEN Yuxia;GUO Yong;College of Furnishings and Industrial Design,Nanjing Forestry University;College of Forestry and Landscape Architecture,Anhui Agriculture University;  
Based on biomechanical analysis on knee and hip joints in supine position with knee flexion,formulations were developed to calculate joint and muscle forces of knee and hip joints. The effect of mattress force and joint angles on joints and muscle forces of knee and hip were also investigated in this study. The results showed that,with the knee flexion angle in the range of 0°-80°,the knee joint and quadriceps femor muscle forces decreased with the increase of the knee flexion angle. The values of knee joint and muscle forces were relatively lowand stable when the flexion angle was over 80°. The hip joint and iliopsoas muscle forces were relatively lower when the hip joint flexion was lower than 60°. With an increase in mattress forces on foot and hip,the joints and muscle forces of both knee and hip joints increased. During the most sleeping conditions,the angles of knee and hip joints were lower than 90° with higher knee muscle and hip joint forces,leading to muscle fatigue. It was demonstrated that the time to keep knee and hip flexion position was limited and illuminated intrinsic reason for the necessity of posture change during sleep from the angle of biomechanics.
【Fund】: 安徽省自然科学基金(1308085QH133)
【CateGory Index】: TS941.75
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