Accuracy of radiographic measurement techniques for the Taylor spatial frame mounting parameters

BMC Musculoskeletal Disorders

Thomas A. Schildhauer¹  Yannik Hanusrichter¹  Sven Frieler¹  Hinnerk Baecker¹  Matthias Königshausen¹  Jan Gessmann¹  Dominik Seybold¹ 

[1] Department of Trauma Surgery, BG University Hospital Bergmannsheil, Ruhr University Bochum, Bürkle-de-la-Camp-Platz 1, 44789, Bochum, Germany;

关键词: Taylor spatial frame;    Hexapod;    Mounting parameter;    Deformity correction;    Planning;   

DOI  :  10.1186/s12891-021-04084-0

来源: Springer

【 摘 要 】

AimThe correction accuracy of the Taylor Spatial Frame (TSF) fixator depends considerably on the precise determination of the mounting parameters (MP). Incorrect parameters result in secondary deformities that require subsequent corrections. Different techniques have been described to improve the precision of MP measurement, although exact calculation is reportedly impossible radiologically. The aim of this study was to investigate the accuracy of intraoperative and postoperative radiographic measurement methods compared to direct MP measurement from TSF bone mounting.MethodsA tibial Sawbone® model was established with different origins and reference ring positions. First, reference MPs for each origin were measured directly on the frame and bone using a calibrated, digital vernier calliper. In total 150 MPs measured with three different radiographic measurement techniques were compared to the reference MPs: digital radiographic measurements were performed using soft-copy PACS images without (method A) and with (method B) calibration and calibrated image intensifier images (method C).ResultsMPs measured from a non-calibrated X-ray image (method A) showed the highest variance compared to the reference MPs. A greater distance between the origin and the reference ring corresponded to less accurate MP measurements with method A. However, the MPs measured from calibrated X-ray images (method B) and calibrated image intensifier images (method C) were intercomparable (p = 0.226) and showed only minor differences compared to the reference values but significant differences to method A (p < 0,001).ConclusionThe results demonstrate that MPs can be accurately measured with radiographic techniques when using calibration markers and a software calibration tool, thus minimizing the source of error and improving the quality of correction.

【 授权许可】

CC BY