Abstract

LOPREITE, Fernando et al. Use of immediate postoperative radiographs to predict mechanical loosening in cemented cups. Rev. Asoc. Argent. Ortop. Traumatol. [online]. 2012, vol.77, n.2, pp.118-123. ISSN 1852-7434.

Background: the durability of prosthetic components in total hip arthroplasty (THA) is one of the main topics of discussion. In the evaluation of the acetabular mechanical loosening (AML) come into play several aspects, including the hardened. A retrospective analysis was performed to predict the AML, analyzing the quality of the cemented in immediate radiography (Rx) postoperative (PO), comparing it to the radiographic findings in the medium and long term. Methods: 180 cemented THA, with an average of 7.7 years follow-up and an average age of 66 years-old were analyzed. Interface bone-cement of each cup were analyzed, comparing the immediate PO Rx with the ultimate control, settling a score for boundaries observed in each area of Lee Charnley, capable of identifying and evalua-ting the AML. Results: of the 180 THA, 149 cups were considered well fixed (83%) and 31 badly fixed (17%). The radiographic AML averaged was 12.7% (23 of 180 hips). The median follow-up was 7.7 years. In the initially well set, there were 20 cases of radiographic AML (11.1%), without need for revision surgery. The wrong set cups had a percentage of AML clinical and radiographic 19,35% (6/31). Conclusions: we consider that a correct cemented technique decreases the likelihood of radiographic AML and improve long term clinical survival. While longer term follow-up and a greater number of patients are necessary, we believe that the quality of the cement interdigitation, in the immediate PO Rx is predictive of future AMA.

Keywords : Mechanical loosening; THA; Hardened little technique of cemented; Interface bone-cement; Prediction.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )