Bi-planar calibration method for templating of hip joint arthroplasty: phantom study and proof of concept

被引:1
|
作者
Boese, Christoph Kolja [1 ]
Rolvien, Tim [1 ]
Henes, Frank Oliver [2 ]
Beil, Frank Timo [1 ]
Strahl, Andre [1 ]
Ries, Christian [1 ]
机构
[1] Univ Med Ctr Hamburg Eppendorf, Dept Trauma & Orthopaed Surg, Div Orthopaed, Martinistr 52, D-20246 Hamburg, Germany
[2] Univ Med Ctr Hamburg Eppendorf, Ctr Radiol & Endoscopy, Dept Diagnost & Intervent Radiol & Nucl Med, Martinistr 52, D-20246 Hamburg, Germany
关键词
Digital templating; Total hip arthroplasty; Joint arthroplasty; Arthroplasty; Digital radiography; ACCURACY; MAGNIFICATION;
D O I
10.1007/s00264-023-05747-4
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Purpose Calibration of radiographs is a critical step in digital templating for hip arthroplasty. Calibration errors of > 1.5% lead to over-or undersizing of the templated implants and may affect logistics and patient safety. Contemporary calibration methods are known to be imprecise with average errors of 6.5% and wide variance. A novel bi-planar radiograph-based calibration method is proposed, and a phantom study was conducted as proof of concept.Methods A spherical external calibration marker (ECM) is placed in front of the pubic symphysis of a pelvic bone model at twelve different positions. For each marker position, standard anteroposterior radiographs and four corresponding lateral radiographs with different degrees of rotation (0 degrees-30 degrees) are taken (overall, 60 radiographs). Calibration factors are calculated for an internal calibration marker (ICM) at the centre of the right hip (reference) and the ECM using a novel algorithm. Rotation and marker positions simulate foreseeable use errors and misplacements and aim to test robustness of the method against these errors.Results ECM calibration factor was 125.9% (range 124.7-127.2), and the mean ICM calibration factor was 126.6% (range 126.2-127.1) ( p < 0.001 ). Four images (8.3%) were beyond the 1% error threshold (all with 30 degrees rotation). The mean difference was 0.79% (SD 0.49).Conclusion The bi-planar method precisely predicts the true calibration factor of the hip joint plane under various conditions. In lateral radiographs, rotation of up to 20 degrees did not adversely affect the precision and all images had calibration errors below the threshold for clinical significance.
引用
收藏
页码:1249 / 1257
页数:9
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