How to Improve the Prediction of Quadrupled Semitendinosus and Gracilis Autograft Sizes With Magnetic Resonance Imaging and Ultrasonography

Abstract

Preoperative calculation of the CSA of the hamstring tendons with MRI and US can help to reliably estimate 4ST-GT grafts. In terms of correlation of the CSA with graft diameter, US was comparable to 2× MRI, but 4× MRI showed a much greater accuracy. Threshold values of the CSA of the ST and GT of 25 mm2, 17 mm2, and 14 mm2 with the 2× MRI, 4× MRI, and US methods, respectively, are needed to reliably predict a 4ST-GT graft with a minimum diameter of 8 mm.