Beynnon B D, Meriam C M, Ryder S H, Fleming B C, Johnson R J
Department of Orthopaedics and Rehabilitation, McClure Musculoskeletal Research Center, University of Vermont, Burlington 05405-0084, USA.
Am J Sports Med. 1998 Jul-Aug;26(4):536-9. doi: 10.1177/03635465980260041101.
The long-term success of a hamstring tendon graft depends not only on the type of device that is used for fixation but also on the mechanical interlocking of the soft tissue between the fixation device and bone. The purpose of this study was to evaluate the effect of screw insertion torque on the structural properties of soft tissue fixed to bone with a spiked metal washer. Two bovine tendons, one similar in size to a human semitendinosus tendon and the other similar in size to a human gracilis tendon, were secured to a bovine femur using a figure-of-8 technique with screws and metal spiked washers. A single load to failure was applied at 25 mm/sec. A significant positive linear correlation was observed between fixation screw insertion torque magnitude and the ultimate failure load value. An increase in the fixation screw insertion torque produced an increase in the ultimate failure load value. Similarly, there was a significant positive linear correlation between fixation screw insertion torque magnitude and the average maximum linear load value. No relationship was detected between screw insertion torque magnitude and the linear stiffness values of the tendon-fixation construct, indicating that a reproducible model was used. This study demonstrates that screw insertion torque is an important variable that controls the initial strength of soft tissue fixation to bone.
绳肌腱移植的长期成功不仅取决于用于固定的器械类型，还取决于固定器械与骨骼之间软组织的机械嵌合。本研究的目的是评估螺钉插入扭矩对用带尖金属垫圈固定于骨的软组织结构性能的影响。使用两根牛肌腱，一根尺寸与人的半腱肌肌腱相似，另一根尺寸与人的股薄肌肌腱相似，采用8字技术用螺钉和带尖金属垫圈固定于牛股骨。以25毫米/秒的速度施加单次破坏载荷。观察到固定螺钉插入扭矩大小与极限破坏载荷值之间存在显著的正线性相关性。固定螺钉插入扭矩的增加导致极限破坏载荷值增加。同样，固定螺钉插入扭矩大小与平均最大线性载荷值之间也存在显著的正线性相关性。未检测到螺钉插入扭矩大小与肌腱固定结构的线性刚度值之间的关系，表明使用了可重复的模型。本研究表明，螺钉插入扭矩是控制软组织固定于骨的初始强度的一个重要变量。
