Järvinen Teppo L N, Nurmi Janne T, Sievänen Harri
Medical School and Institute of Medical Technology, University of Tampere, Tampere, Finland.
Am J Sports Med. 2004 Sep;32(6):1421-9. doi: 10.1177/0363546503262168. Epub 2004 Jul 20.
Bone mineral density and interference screw insertion torque are thought to be useful predictors of anterior cruciate ligament graft fixation strength.
Bone mineral density and insertion torque are reliable predictors of anterior cruciate ligament graft fixation strength.
Randomized experimental study.
The volumetric bone mineral density, maximum insertion torque, and initial fixation strength (determined both as cyclic-loading-induced displacement and yield load) were recorded on 21 pairs of anterior cruciate ligament reconstructions. To assess the accuracy of bone mineral density and insertion torque in predicting the fixation strength, half of the specimens were first used to determine the regression equations between the variables, and then the data from the remaining specimens were used to validate the prediction equations.
Despite the relatively high group correlations, the ability of bone mineral density and insertion torque to predict the strength of graft fixation was poor. Errors ranging from -150% to 92%, -22% to 50%, -56% to 121%, and -23% to 50% were observed when bone mineral density and insertion torque were used to predict individual cyclic-loading-induced displacement and yield load, respectively.
Neither bone mineral density nor insertion torque provides a sufficiently accurate prediction of the fixation strength of an individual soft tissue anterior cruciate ligament graft.
Bone mineral density and insertion torque cannot be used to estimate the strength of interference screw fixation in anterior cruciate ligament reconstruction.
骨矿物质密度和干涉螺钉插入扭矩被认为是前交叉韧带移植物固定强度的有用预测指标。
骨矿物质密度和插入扭矩是前交叉韧带移植物固定强度的可靠预测指标。
随机实验研究。
记录21对前交叉韧带重建手术中的骨体积密度、最大插入扭矩和初始固定强度（通过循环加载引起的位移和屈服载荷来确定）。为了评估骨矿物质密度和插入扭矩在预测固定强度方面的准确性，首先使用一半的标本确定变量之间的回归方程，然后使用其余标本的数据验证预测方程。
尽管组内相关性相对较高，但骨矿物质密度和插入扭矩预测移植物固定强度的能力较差。当分别使用骨矿物质密度和插入扭矩预测个体循环加载引起的位移和屈服载荷时，观察到的误差范围分别为-150%至92%、-22%至50%、-56%至121%和-23%至50%。
骨矿物质密度和插入扭矩均不能充分准确地预测个体软组织前交叉韧带移植物的固定强度。
骨矿物质密度和插入扭矩不能用于估计前交叉韧带重建中干涉螺钉固定的强度。
