Antéversion des pièces prothétiques lors d’une PTH sans ciment à tige droite et cupule hémisphérique : étude prospective de 91 hanches mesurées par tomodensitométrie - 14/10/11
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Summary |
Background |
The recommended range of anteversion of the components in total hip arthroplasty (THA) is between 10 and 30°, but the intraoperative estimation of these versions may be inadequate.
Hypothesis |
The components anteversion in primary cementless THA using straight stem and hemispherical cup is not significantly different from the native anteversion of the hip joint.
Objectives |
To evaluate in a prospective manner the range of anteversion currently achieved in cementless THA.
Materials and methods |
Five senior surgeons operated 91 patients with primary cementless THA. We used a straight press fit stem and a hemispherical press fit cup. We aimed to obtain femoral anteversion of 10° to 30°, acetabular anteversion of 10° to 30° and a global combined anteversion of 25° to 55°. Cup position was checked with an impactor-positioner, and stem position was determined with the knee flexed 90°. In all cases we used elevated liners and 28mm diameter ceramic heads. At 3months postoperatively the component versions were measured using a General Electric LightSpeed Pro 16 (Milwaukee, Wi, USA) with the patient in supine position.
Results |
Femoral component measurements ranged from 17° of retroversion to 60° of anteversion with a mean of 23.0°±11.8°. Similarly, acetabular component version ranged from 28° of retroversion to 46° of anteversion with a mean of 18.5°±13.7°. There were no correlations to the native femoral and acetabular versions. Only 55 hips (60.4 %) were within the accepted range of 25° to 55° of combined anteversion, but none of the cases dislocated during a follow-up of two years.
Conclusion |
In cementless THA with our operative technique, the intraoperative estimation of femoral and acetabular anteversion, in many cases, resulted to be inadequate in relation to the intended range of 10° to 30° of anteversion.
Level of evidence |
Level III prospective diagnostic.
Le texte complet de cet article est disponible en PDF.Keywords : Arthroplasty, Component positioning, CT-scan, Hip, Measurement
Plan
Cet article peut être consulté in extenso dans la version anglaise de la revue Orthopaedics & Traumatology: Surgery & Research sur Science Direct (www.sciencedirect.com/) en utilisant le DOI ci-dessus. |
Vol 97 - N° 6
P. 600-601 - octobre 2011 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.
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