Results Best evidence analysis showed no difference in polyethylene wear rate , the frequency of cup migration , and aseptic loosening between monoblock and modular acetabular components .
No convincing evidence was found for the cl aim that lower frequencies of acetabular osteolysis are observed with the use of monoblock cups compared with modular uncemented cups .
Conclusions The purported benefits of monoblock cups were not substantiated by this systematic review of controlled studies in that polyethylene wear rates and frequencies of cup failure and acetabular osteolysis were similar to those observed with modular implants .
Background Monoblock acetabular components used in uncemented total hip arthroplasty ( THA ) have certain mechanical characteristics that potentially reduce acetabular osteolysis and polyethylene wear .
However , the degree to which they achieve this goal is not well documented .
Questions / purpose sThe purpose of this study was to use a systematic review of controlled trials to test the hypothesis that monoblock cups have superior ( 1 ) polyethylene wear rate ; ( 2 ) frequency of cup migration ; ( 3 ) frequency of acetabular osteolysis ; and ( 4 ) frequency of aseptic loosening compared with modular components used in uncemented THA .
Eight- to ten-year clinical and radiographic outcome of a porous tantalum monoblock acetabular component.
In a prospect i ve study , the authors used a porous tantalum monoblock acetabular component for primary total hip arthroplasty between November 1997 and June 1999 . A total of 156 consecutive primary total hip arthroplasty were done in 143 patients younger than 75 years . A total of 151 hips had a follow-up time from 8 to 10 years . The average preoperative total Harris hip score of 44.0 + /- 13.8 increased to 97.0 + /- 6.2 at the latest follow-up . The average preoperative Oxford hip score of 43.3 + /- 6.5 improved to 13.9 + /- 2.3 at the latest follow-up . Radiographic evaluation including the Ein-Bild-Röntgen-Analyse ( EBRA ) digital system showed no radiographic evidence of gross polyethylene wear , progressive radiolucencies , osteolytic lesions , acetabular fracture , or component subsidence . There were 7 ( 4.5 % ) postoperative complications all unrelated to the acetabular component
Results Best evidence analysis showed no difference in polyethylene wear rate , the frequency of cup migration , and aseptic loosening between monoblock and modular acetabular components .
No convincing evidence was found for the cl aim that lower frequencies of acetabular osteolysis are observed with the use of monoblock cups compared with modular uncemented cups .
Conclusions The purported benefits of monoblock cups were not substantiated by this systematic review of controlled studies in that polyethylene wear rates and frequencies of cup failure and acetabular osteolysis were similar to those observed with modular implants .
Background Monoblock acetabular components used in uncemented total hip arthroplasty ( THA ) have certain mechanical characteristics that potentially reduce acetabular osteolysis and polyethylene wear .
However , the degree to which they achieve this goal is not well documented .
Questions / purpose sThe purpose of this study was to use a systematic review of controlled trials to test the hypothesis that monoblock cups have superior ( 1 ) polyethylene wear rate ; ( 2 ) frequency of cup migration ; ( 3 ) frequency of acetabular osteolysis ; and ( 4 ) frequency of aseptic loosening compared with modular components used in uncemented THA .