BACKGROUND AND PURPOSE Monoblock acetabular cups represent a subtype of uncemented cups with the polyethylene liner molded into a metal shell, thus eliminating-or at least minimizing-potential backside wear. We hypothesized that the use of monoblock cups could reduce the incidence of osteolysis and aseptic loosening, and thus improve survival compared to modular designs. PATIENTS AND METHODS ...

Isolated wear of the polyethylene tibial component led to failure in five of a series of 108 uncemented porous-coated knee replacements. The clinical features included pain, effusion and instability with progressive varus deformity. In all cases there was extensive wear on the medial side of the polyethylene surface of the prosthesis. The mechanism of such wear is complex, being due in part to ...

Biological fixation of uncemented endosseous implants requires the apposition of bone onto implant’s surface in a process named osseointegration [1]. The present study examined bone tissue response to Ti-6Al-4V alloy implanted into the rat femurs over a long time range (3 days to 6 months). The progression of implants fixation in the cancellous bone of distal epiphysis and within the medullary ...

There are still some controversial issues regarding total hip arthroplasty including cemented vs. cementless, short stem vs. long stem. A literature review on the currently published survival results of short stems is encouraging and appears to be comparable with that of traditional uncemented stems. However, only few mid-term and long-term follow-up studies are available; studies with more pat...