Abstract
The aim of this study was to evaluate the survivorship of cemented stems for hip replacement. From March 1989 to October 1991, 98 patients underwent total hip arthroplasty using the Lubinus SPII stem. The preoperative diagnoses included 73 cases of osteoarthritis, 17 fractures of the femoral neck, and 8 cases of aseptic loosening. The adopted acetabular cups were: in 59 cases a screwed cup V-Thabe (Waldemar Link, Hamburg, Germany); in 5 cases the press-fit cup Mallory-head (Biomet, Inc., Warsaw, IN, USA); in 3 cases a Muller cemented cup; and in 2 cases a cemented cup (Waldemar Link). In the 17 cases of fracture, a hemispherical biarticular cup was employed. The SPII (Waldemar Link) stem is made of a chromecobalt alloy; it is smooth and 150-mm long. Its shape anatomically reproduces the curves of the femoral shaft. The neck had anatomical anteversion for the right and left femurs, and an inclination of 135°. Cementation was performed using CMW3 cement, mixed under vacuum, and injected with a needle after positioning an intramedullary plug. The survivorship of 98 implants, was evaluated after 10 years. The survival rate was 98%. The Lubinus SPII prosthetic stem shows a high rate of survival. The influencing factors of this good outcome are the prosthetic design, the improvement in cementation techniques, and after all a good surgical technique.
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