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However, no study has investigated the prediction of the intraoperative diameter of the quadriceps tendon (QT) autograft based upon preoperative imaging. This study investigated the correlation between the intraoperative diameter of a QT autograft and in situ thickness or cross\u2010sectional area (CSA) measured using preoperative MRI.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Thirty\u2010one knees of 31 patients (mean age 20.9\u2009\u00b1\u20095.0 years) who underwent individualized anatomic ACLR using all soft tissue QT autograft were included retrospectively. At 15\u00a0mm proximal to the superior pole of the patella, the maximum QT thickness was assessed in the sagittal plane and the CSA was assessed at the central 10\u00a0mm of the QT in the axial plane. The angle between the axial plane and a line perpendicular to the QT longitudinal axis was used to calculate an adjusted CSA using a cosine function. Intraoperatively, each QT autograft was harvested with 10\u00a0mm width and the diameter was measured using a graft sizing device.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Intra\u2010 and inter\u2010observer reliabilities of all measurements using preoperative MRI were excellent (intra\u2010class correlation coefficient, 0.833\u20130.970). Significant correlations were observed between the thickness, CSA, or adjusted CSA, and the intraoperative diameter (<jats:italic>R<\/jats:italic>\u2009=\u20090.434, 0.607, and 0.540, respectively; <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The CSA correlated most strongly with the QT autograft diameter. For individualized anatomic ACLR, measuring in situ CSA can be useful for preoperative planning of appropriate graft choices prior to surgery.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>III.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-020-05993-8","type":"journal-article","created":{"date-parts":[[2020,4,24]],"date-time":"2020-04-24T06:27:07Z","timestamp":1587709627000},"page":"742-749","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["In situ cross\u2010sectional area of the quadriceps tendon using preoperative magnetic resonance imaging significantly correlates with the intraoperative diameter of the quadriceps tendon autograft"],"prefix":"10.1002","volume":"29","author":[{"given":"Satoshi","family":"Takeuchi","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopaedic Surgery University of Pittsburgh Kaufman Medical Building, 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