naa a22 4500 510760600 CHVBK 20180411083138.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11420-013-9334-z doi (NATIONALLICENCE)springer-10.1007/s11420-013-9334-z The Validity and Reliability of Preoperative Radiographic Canal Diameter Measurements of the Femur [Elektronische Daten] [Kenneth Walsh, John Fowler, Oliver Chen, John Gaughan, Sayed Ali, Mahin Rehman, Saqib Rehman] Background:: The femoral canal is frequently measured preoperatively in cases where an intramedullary device is planned for operative fixation of a fracture. To our knowledge, a formal assessment of validity and reliability of preoperative canal measurements has not been previously performed. Questions/Purposes:: This study aims to determine the validity and reliability of preoperative canal measurements of the femur made on plain radiographs using comparison with curved planar reformation software as the gold standard. Methods:: Fifty-six patients were identified based on availability of anterior-posterior (AP) and lateral radiographs of the femur and computed tomography (CT) of the lower extremity. Four "raters” measured the canal diameter at its narrowest point and the distance from the lesser trochanter to the isthmus on the AP, lateral radiograph, and CT. The width of the femoral nail on AP radiographs was also measured to determine magnification error. Curved planar reformation (CPR) was used to provide the most accurate calculation of the canal diameter. Results:: Compared to the isthmus position determined by CPR, the measurement was most accurate on an AP and the diameter of the canal was most accurate using coronal CT, followed by AP radiographs. The measured canal diameter of the fractured femur on APs was compared to that of the used implant and varied by 1mm. Discussion/Conclusion:: The AP plain radiographic measurement was found to be more accurate for determination of the canal diameter compared to the lateral radiograph. These findings confirm the utility of preoperative canal measurements in predicting the feasibility of placing a specific size intramedullary implant. Hospital for Special Surgery, 2013 femur nationallicence canal nationallicence measurements nationallicence radiographic nationallicence preoperative nationallicence Walsh Kenneth Temple University School of Medicine, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Fowler John Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Chen Oliver Department of Radiology, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Gaughan John Biostatistics Consulting Center, Temple University School of Medicine, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Ali Sayed Department of Radiology, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Rehman Mahin Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut Rehman Saqib Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut HSS Journal ® Springer US; http://www.springer-ny.com 9/2(2013-07-01), 150-156 1556-3316 9:2<150 2013 9 11420 https://doi.org/10.1007/s11420-013-9334-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11420-013-9334-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Walsh Kenneth Temple University School of Medicine, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Fowler John Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Chen Oliver Department of Radiology, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Gaughan John Biostatistics Consulting Center, Temple University School of Medicine, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Ali Sayed Department of Radiology, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Rehman Mahin Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 700 1- Rehman Saqib Department of Orthopaedics, Temple University Hospital, 3401 N Broad St, 19140, Philadelphia, PA, USA aut NATIONALLICENCE 773 0- HSS Journal ® Springer US; http://www.springer-ny.com 9/2(2013-07-01), 150-156 1556-3316 9:2<150 2013 9 11420 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer