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Three-dimensional bone-implant movements in trochanteric hip fractures. Precision and accuracy of radiostereometric analysis in a phantom model.

Artikel i vetenskaplig tidskrift
Författare Alicja J. Bojan
Charles R Bragdon
Anders Jönsson
Carl Ekholm
Johan Kärrholm
Publicerad i Journal of orthopaedic research : official publication of the Orthopaedic Research Society
Volym 33
Nummer/häfte 5
Sidor 705-11
ISSN 1554-527X
Publiceringsår 2015
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för ortopedi
Sidor 705-11
Språk en
Länkar dx.doi.org/10.1002/jor.22822
Ämneskategorier Ortopedi

Sammanfattning

The accuracy and precision of RSA was evaluated in the experimental study of screw cut-out complication after fixation of trochanteric fractures. A plastic bone model of a two-part trochanteric fracture was constructed with a Gamma nail implant incorporating RSA markers. The femoral head fragment was attached to a separate rotational table and the femoral shaft was mounted on the micrometer. Three main motions were simulated: femoral head translation and rotation along the axis of the lag screw and fracture fragment translation along anatomical axes. Accuracy and precision were determined according to ISO 16087 and ASTM standard F2385-04. Translations along the lag screw axis were measured with a precision within ± 0.14mm and an accuracy within ± 0.03mm. With simultaneous translations along all three anatomical axes, lowest precision was measured for the x-axis (± 0.29mm, 0.07mm respectively), but improved when analyzed as a vector (± 0.08mm, 0.03mm). The precision and accuracy of femoral head rotations were within 0.5° and 0.18°, respectively. The resolution of the RSA method tested in this model was high, though it varied depending on the type of analyzed motion. This information is valuable when selecting and interpreting outcome parameters evaluating implant migration and osteosynthesis stability in future clinical RSA studies. This article is protected by copyright. All rights reserved.

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