This might influence the surgeons to choose the TM design in already re-revised cases with more pronounced acetabular bone loss.
According to our analysis, risk for aseptic loosening of the ABG I cup was significantly higher in men, Charnley type C patients, and those having more severe acetabular bone defects and longer time to surgery.
We found that men (odds ratio, OR = 5.6; p = 0.004), patients with Charnley class C (OR = 6.71; p = 0.013), those having more severe acetabular bone defects (OR = 4 for each degree of severity; p = 0.002), and longer time to revision surgery (OR = 1.51 for each additional year; p = 0.012) had a greater chance of aseptic loosening of the cup.
Due to the high age of specimens the bone quality was low and labrums were calcified, which made it more difficult to determine the border between the labrum and the acetabular bone on the CT-scans.
For the conservative approach of the acetabular bone stock, from our experience we do not agree that more bone is removed in hip resurfacing (HRA) than in total hip arthroplasty (THA).
The more rigid acetabular components used with large femoral head MoM THRs may increase the risk of stress shielding and associated acetabular bone loss, potentially affecting both short and long-term fixation as well as bone stock available at the time of revision surgery.
Allograft augmentation of the acetabulum was also used to repair the acetabular bone defect.
Although uncemented hemispherical cups are a valid option in small acetabular defects, it is accepted that they provide poor results when acetabular bone defects are >50%[12]2].
The femoral head had eroded through the polyethylene liner and continued through the roof of the titanium acetabular component to rest on the acetabular bone (Fig. 2).
A novel acetabular component with three wings has earlier been explored for reconstructing extensive acetabular bone defects in hip revision arthroplasty with a satisfying clinical result.
