Predicting Pediatric ACL Graft Size

The purpose of this study was to evaluate the predictive value MRI in determining hamstring autograft size preoperatively for pediatric ACL reconstructions. Children and adolescents from 10-20 years old that had undergone reconstruction using were identified 2017-2018. Semitendinosus gracilis cross-sectional area diameter measured on preoperative knee MRIs field interest (FOI) distance measurement tools. slice used as largest section by measuring surgeon. Two surgeons independently all MRIs. Preoperative demographic data (height, weight, body mass index (BMI), gender) operative (graft size) collected. Data analyzed an independent statistician. Ordinal regression analysis performed determine relationship between graft size. A Classification Regression Tree (CART) constructed identify predictors pre-determined sizes 8 mm. Receiver operating characteristics (ROC) then created assess performance model sensitivity specificity. All analyses SPSS v. 24 with alpha set at p<0.05 declare significance. One hundred ten children (54 boys, 56 girls) included average age 15.93 (range 11.81-20.22) BMI 25.98 16.02-40.08). CART determined if sum areas semitendinosus tendons greater than 31.17 mm 87.5% or greater. ROC have 80% 74% specificity predicting a larger. summation predicts intraoperative larger children.