Biomechanical analysis of the knee joint with different braces during a land-jump task

• Main Authors: Yu-Lun Cheng, 程郁倫
• Other Authors: Chen-Sheng Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/10359697718776223312

碩士 === 國立陽明大學 === 物理治療暨輔助科技學系 === 98 === Running, stop-jumping, and cutting is often appeared in many sports like basketball, volleyball, and football. Knee joint is the major shock- absorption part in human body. Suddenly an excessive force or a chronic inappropriate force made knee joint injured. Knee braces are one of the methods for protecting and preventing knee injuries in recent years. There's a wide gap in costs of a simple knee sleeve and a knee brace with bilateral extra supports, however, there's limited evidence showed the structural differences between these braces. To study the biomechanics of the knee joints with different kind of braces and the gender differences in land-jump task, the experimental task was a lay-up task in basketball and be analyzed in landing phase and jumping phases. A mathematical model using a Matlab software was implemented to analyze the knee joint biomechanics. The force plate and motion analysis system were conducted to collect data. The knee brace M4531 and M3333 were chosen to be analyzed in terms of ground reaction force (GRF), knee joint force (KJF), jumping height, and gender difference, and be examined in ANOVA. The result indicated that the vertical peak GRF and KJF value in landing, and the vertical peak KJF value in jumping with M3333 were higher than those with barefoot (p<0.05). The posterior peak GRF value and the anterior peak KJF value with M3333 were lower than those with barefoot (p<0.05). The results with M4531 was as same as with M3333 in vertical direction (p<0.05). However, there was no significant difference between M4531 and barefoot in anterio-posterior direction. About jumping height, there was no significant difference between different knee brace groups but was difference between genders. Additionally, male with brace was higher than female with brace in jumping height. According to the results, wearing M3333 and M4531 increased the vertical KJF but didn’t affect the jumping height. However, wearing M3333 decreased the anterio-posterior KJF for protecting knee joint.