BACKGROUND:In rabbit femur fracture model experiment, there are a few studies on whether quadriceps tendon wil affect the stability of the fixed device. OBJECTIVE:To analyze the effects of quadriceps tendon to the stability of external fixator in rabbit models of femur fracture. METHODS:The 48 New Zealand white rabbits were randomly divided into two groups. External fixator was used to make fracture model. In the experiment group, quadriceps tendon was cut. In the control group, quadriceps tendon was retained. 2 weeks later, X-ray examination was utilized to observe the number of failed external fixator in both groups from modeling to success. RESULTS AND CONCLUSION:(1) X-ray examination:2 weeks after model establishment, external fixation frame screw was free from femur in one rabbit of the experiment group, and seven rabbits in the control group. Of them, one screw was broken. Threaded portion retained in the femur. (2) External fixation failure rate:failed external fixator was found in one rabbit in the experiment group, resulting in a failure rate of 4%, and 12 rabbits in the control group, resulting in a failure rate of 50%(P<0.05). These findings suggested that cutting off the rabbit quadriceps tendon can effectively ensure the stability of the external fixator, and indirectly improve success rate of the experiment.%背景：在兔股骨骨折类造模实验中，关于股四头肌肌腱是否会影响固定装置稳定性的相关研究较少。目的：分析股四头肌肌腱对兔股骨骨折模型中外固定架稳定性的影响。方法：将48只新西兰大白兔随机分为2组，使用外固定架制作兔股骨骨折模型，实验组切断股四头肌肌腱，对照组保留股四头肌肌腱，2周后行X射线检查观察在骨折造模开始到成功阶段2组外固定架失效的数量。结果与结论：①X射线检查：造模后2周实验组1只兔外固定架螺钉游离于股骨外，对照组7只实验兔外固定架螺钉游离于股骨外，其中1只螺钉折断，螺纹部分留置于股骨内；②外固定架失效率：实验组1只兔外固定架失效，失效率4%，对照组12只兔外固定架失效，失效率50%，差异有显著性意义(P<0.05)。结果证明切断兔股四头肌肌腱可以有效地保证术后兔外固定架的稳定性，间接的提高了实验的成功率。
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