• Hirokazu Takai, Masatoshi Murayama, Sakumo Kii, Daisuke Mito, Chihiro Hayai, Satoru Motohashi, and Tomoki Takahashi.
• Department of Orthopaedic Surgery, Kumamoto Kinoh Hospital, Kumamoto, Japan. Electronic address: hirokazoid@hotmail.co.jp.
• Injury. 2018 Jun 1; 49 (6): 1149-1154.

PurposeADAPT is a fluoroscopic computer-assisted surgery system which intraoperatively shows the distance from the tip of the screw to the surface of the femoral head, tip-to-head-surface distance (TSD), and the tip-apex distance (TAD) advocated by Baumgaertner et al. The study evaluated the accuracy of ADAPT.Patients And MethodsA total of 55 patients operated with ADAPT between August 2016 and March 2017 were included as subjects. TSD and TAD were measured postoperatively using computed tomography (CT) and X-rays. The intraclass correlation coefficient (ICC) was checked in advance. The error was defined as the difference between postoperative and intraoperative measurement values of ADAPT. Summary statistics, root mean square errors (RMSEs), and correlations were evaluated.ResultsICC was 0.94 [95% CI: 0.90-0.96] in TSD and 0.99 [95% CI: 0.98-0.99] in TAD. The error was -0.35 mm (-1.83 mm to 1.12 mm) in TSD and +0.63 mm (-5.65 mm to 4.59 mm) in TAD. RMSE was 0.63 mm in TSD and 1.53 mm in TAD. Pearson's correlation coefficient was 0.79 [95% CI: 0.66-0.87] in TSD and 0.83 [95% CI: 0.72-0.89] in TAD. There were no adverse events with ADAPT use.ConclusionADAPT is highly accurate and useful in guiding surgeons in properly positioning the screws.Copyright © 2018 The Authors. Published by Elsevier Ltd.. All rights reserved.

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