A Comparison of the Accuracy of Three Intraoperative Techniques for Measuring Rotational Correction in Varus Derotational Osteotomies of the Femur.
Background: Based on the complexity of proximal femoral geometry, osteotomies in the coronal plane may change femoral version, while osteotomies in the plane of the femoral neck should not. Theoretically, this relationship can lead to a systematic error when measuring rotational correction in the pr...
| Publicado en: | Journal of Bone & Joint Surgery, American Volume Vol. 96; no. 14; pp. 1193 - 1200 |
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| Autores principales: | , |
| Formato: | pictorial research tables/charts Journal Article |
| Publicado: |
Lippincott Williams & Wilkins
7/16/2014
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=97123982&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 97123982 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00219355 1H2 jtl: Journal of Bone & Joint Surgery, American Volume issn: 00219355 maglogo: N pubinfo: dt: 7/16/2014 vid: 96 iid: 14 pid: 433 pub: Lippincott Williams & Wilkins place: Baltimore, Maryland artinfo: ui: 97123982 97123982 NLM25031374 97123982 10.2106/JBJS.M.00982 NLM25031374 97123982 ppf: 1193 ppct: 7 formats: tig: atl: A Comparison of the Accuracy of Three Intraoperative Techniques for Measuring Rotational Correction in Varus Derotational Osteotomies of the Femur. aug: au: Liu, Raymond W. Cooperman, Daniel R. affil: Department of Orthopaedic Surgery, Rainbow Babies and Children’s Hospital, 11100 Euclid Avenue, RBC 6081, Cleveland, OH 44106 sug: subj: Osteotomy Methods Intraoperative Care Methods Femur Neck Surgery Rotation Reproducibility of Results Models, Theoretical Validation Studies Comparative Studies Evaluation Research Multicenter Studies Human ab: Background: Based on the complexity of proximal femoral geometry, osteotomies in the coronal plane may change femoral version, while osteotomies in the plane of the femoral neck should not. Theoretically, this relationship can lead to a systematic error when measuring rotational correction in the proximal part of the femur.Methods: We developed a mathematical model to predict the error with three different techniques for rotational measurement: (1) a pin along the axis of the femoral neck and a lateral pin across the femoral condyles, (2) a proximal lateral pin perpendicular to the femur and a lateral pin across the femoral condyles, and (3) two anterior pins representing a score mark on the proximal part of the femur. Varus derotational osteotomies were performed on twenty-four Sawbone femora, and femoral anteversion and the angles between each set of pins were measured.Results: Our mathematical model predicted no error with the neck-pin technique regardless of the type of osteotomy performed. With the lateral pin technique, there was no predicted error with the neck plane osteotomy but a large error with the coronal plane osteotomy. The score-mark technique had a small amount of error with the neck plane osteotomy and a large error with the coronal plane osteotomy. Our Sawbones model measurements correlated well with the mathematical model, with intraclass correlation coefficients of 0.96, 0.89, and 0.91 for the neck-pin, lateral pin, and score-mark techniques, respectively.Conclusions: This study describes and validates a model for predicting the error of three different techniques for measuring femoral rotation. It demonstrates that inadvertent systematic error can occur with lateral pin and score-mark techniques, particularly when the osteotomy is out of plane with the femoral neck.Clinical Relevance: Although the mathematics of this study are complex, the conclusions are clinically straightforward: rotational error is minimized by performing an osteotomy in the plane of the femoral neck or by using a pin in the femoral neck to judge rotation. If neither of these techniques is employed, then systematic error can be introduced and can be substantial. pubtype: Academic Journal doctype: pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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