Abstract
Varying results and a high rate of subsidence have been reported for the straight femoral stem (M.E. Müller) made of titanium alloy. We examined subsidence in 135 titanium-alloy straight stems implanted with high viscosity cement after 68.8±11.5 months using a digital high-precision method (EBRA-FCA). One revised implant showed a subsidence of 14.6 mm and another 2.5 mm over 5 years. A third implant without migration was found to be loose. The 122 implants without loosening showed a mean subsidence of 0.1±0.1 mm, and focal osteolysis was seen in two. Altogether, we found subsidence of the titanium stems very small. The small subsidence may be related to the use of high viscosity bone cement.
Résumé
Des résultats variables et un taux élevé d’enfoncement ont été rapportés pour la tige droite fémorale (Müller) en alliage de titane. Nous avons examiné l’enfoncement dans une série de 135 tiges droites en alliage de titane implantées avec un ciment de haute viscosité après 68,8±11,5 mois en utilisant une méthode numérique de haute précision (EBRA-FCA). Sur un délai de 5 ans un implant révisé a montré un enfoncement de 14.6 mm et un autre de 2.5 mm. Un troisième implant sans migration a été considéré descellé. 122 implants sans descellement ont montré un enfoncement moyen de 0.1±0.1 mm et une ostéolyse focale a été vue dans deux cas. Globalement nous avons trouvé très faible l’enfoncement des tiges en alliage titane. Le petit enfoncement peut être en rapport avec l’usage du ciment à haute viscosité.
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