BACKGROUND: Trabecular metal has shown promising results in experimental studies of bone ingrowth. Several clinical studies support these results. However, until now, no randomized clinical radiostereometric analysis (RSA) studies have been published. In this randomized RSA trial, we compared a new acetabular cup with a surface made of @entity11608 trabecular metal and a cup with a @entity702 fiber-mesh surface. @entity1 AND METHODS: Between 2004 and 2006, we operated 60 @entity1 with noninflammatory @entity625 . The @entity1 were randomized to receive either an uncemented cup with a @entity702 fiber-mesh surface (Trilogy cup) or a cup with a trabecular @entity11608 surface (Monoblock cup). After 2 years, 50 @entity1 had completed the study. The primary endpoint was cup migration within the first 2 years after surgery; the secondary endpoints were change in bone mineral density and Harris hip score at 3 months. RESULTS: Both cup types showed excellent fixation. RSA revealed minimal translation and rotation at 2 years. There was no statistically significant difference between the cup types with regard to translation. However, less rotation along the transverse @entity2270 was seen in the trabecular metal cups than in the fiber mesh cups: mean -0.01   (95% CI: -0.11 to 0.12) for trabecular metal cups and -0.60   (-0.72 to -0.48) for fiber-mesh cups (p = 0.04). The degree of periprosthetic @entity604 was similar between the cup types in any of the regions of interest at 2 years of follow-up. 3 months postoperatively, we found a similar increase in Harris hip score in both groups: from around 50 to over 90. INTERPRETATION: We found promising early results concerning fixation of trabecular metal components to the acetabular host bone. However, we recommend a longer observation period to evaluate the outcome of this new cup design.

Comparison of trabecular metal cups and XXXX fiber-mesh cups in primary hip arthroplasty: a randomized RSA and bone mineral densitometry study of 50 hips.

@entity1 :: ('9606', 'Species') :: ['patients', 'PATIENTS'] @entity625 :: ('MESH:D001168', 'Disease') :: ['hip arthritis'] @entity2270 :: ('MESH:C566610', 'Disease') :: ['axis'] @entity604 :: ('MESH:D016301', 'Disease') :: ['bone loss'] @entity702 :: ('MESH:D014025', 'Chemical') :: ['titanium'] @entity11608 :: ('MESH:D013635', 'Chemical') :: ['tantalum']
@entity702 :: (MESH:D014025,Chemical) :: ['titanium']
