| Summary: | 碩士 === 國立體育學院 === 運動科學研究所 === 90 === The purpose of this study was to explain the role of proprioception in balance control after a rupture in anterior cruciate ligament（ACL）. There were 12 subjects with anterior cruciate ligament deficiency. The mean time elapsed between the injury and the study was 12.8 months（range 9 to 24）. Quadriceps muscle strength, knee joint laxity, proprioception, and balance control ability, were measured, thirteen health subjects were also measured as the control group. Dependent t test was used to compare the injured side and uninjured side. There were significant difference between injured side and uninjured side of knee muscle strength both in extensor and flexor, laxities, and proprioception（p<0.05）. A provocative balance test was used to compare the balance control with patients and control groups with single leg stance test, mean tilts with uninjured side were 5.34± 2.02 degrees, unsteadiness were 1.13±0.73 degrees. Mean tilts with injured side were 6.51±2.25 degrees, and unsteadiness were 1.86±0.93 degrees. Mean tilts of control group were 3.49±1.21 degrees, and unsteadiness were 0.87±0.75 degrees. The results demonstrated statistically significant deficits of the balance control in injured group compared to the control group. A significant correlation between proprioception and balance （r=0.52, p<0.05）was found, but not between muscle strength and balance control（r=0.20 to 0.22, p>0.05）.
It was concluded that patients with a chronic ACL deficiency have an impaired balance control and proprioception. This supports the hypothesis that rehabilitation, with prorpioceptive and agility training, is an important component in restoring the functional stability.
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