Ro Du-Hyun, Lee Sahnghoon, Cho Yool, Lee Young-Min, Lee Myung-Chul, Kim Seong Hwan
Department of Orthopedic Surgery, Seoul National University Hospital, 101 Daehak-Ro Jongno-Gu, Seoul, 110-744 South Korea.
Department of Orthopedic Surgery, Hyundae General Hospital, Chung-Ang University College of Medicine, Seoul, South Korea.
Indian J Orthop. 2020 Feb 12;54(4):444-453. doi: 10.1007/s43465-019-00014-4. eCollection 2020 Jul.
To evaluate the effectiveness of demographic data and radiographic measurements for predicting the diameter and length of autologous semitendinosus (ST) and gracilis (GR) graft.
Fifty-four cases were included to measure the size of 3 or 4 strands of ST and GR tendons retrospectively. The hamstring length on radiograph was defined as the length from the lowest point of ischial tuberosity to intercondylar notch of the femur. The linear and logistic regression analysis was used to assess the roles of the predictor variables, as demographic and radiologic data, in the outcome variables, as diameter of tendon grafts. The cross-validation with hold-out samples and concordance correlation coefficient (CCC) were also calculated.
The hamstring and leg length measurement and gender were associated with the diameter of 4-stranded ST tendon graft. The hamstring length measurement, age and BMI were the factors associated with the diameter of 3-stranded ST tendon graft. The hamstring length measurement was found as a common factor for predicting diameters of hamstring tendon with reliable predictability. Moreover, the equation of multivariate regression analysis for the diameter of 4-stranded ST tendon graft showed the most validated power of prediction. All of the cross-validated values were calculated as similar results of multivariate model, but CCC between the measured diameter and estimated value on the predictive equation showed moderate agreement only (CCC = 0.694).
Combining radiographic length measurements with demographic data showed reliable prediction in identifying the risk of inappropriate graft diameters.
Level IV retrospective cohort study.
评估人口统计学数据和影像学测量对于预测自体半腱肌（ST）和股薄肌（GR）移植物直径及长度的有效性。
纳入54例病例，回顾性测量3或4股ST和GR肌腱的尺寸。X线片上腘绳肌长度定义为坐骨结节最低点至股骨髁间切迹的长度。采用线性和逻辑回归分析评估作为预测变量的人口统计学和放射学数据在作为结果变量的肌腱移植物直径中的作用。还计算了留出样本的交叉验证和一致性相关系数（CCC）。
腘绳肌和腿长测量值以及性别与4股ST肌腱移植物的直径相关。腘绳肌长度测量值、年龄和BMI是与3股ST肌腱移植物直径相关的因素。发现腘绳肌长度测量值是预测腘绳肌腱直径具有可靠预测性的共同因素。此外，4股ST肌腱移植物直径的多元回归分析方程显示出最有效的预测能力。所有交叉验证值计算结果与多元模型相似，但预测方程中测量直径与估计值之间的CCC仅显示出中等一致性（CCC = 0.694）。
将影像学长度测量与人口统计学数据相结合在识别移植物直径不合适风险方面显示出可靠的预测性。
IV级回顾性队列研究。
