A comparison of a second- and a third-generation modular cup design: is new improved?
The highly cross-linked polyethylene liners currently used with modular uncemented cups have substantially decreased wear and osteolysis at early follow-up. However, retroacetabular osteolysis has still been reported in some cases with DePuy Orthopaedic's (Warsaw, IN) second-generation Duraloc acetabular shell. DePuy's third-generation Pinnacle cup incorporates a different shell-liner locking mechanism. We compared the clinical outcome among a matched series of 42 Duraloc and 42 Pinnacle cups at a mean follow-up of 5.9 years. Although the Harris Hip Scores and wear rates were not statistically different between the 2 cup designs, retroacetabular osteolysis behind the central hole was absent among the Pinnacle cups but noted among 19% of the Duraloc cups.
Anderson Orthopaedic Research Institute, Alexandria, Virginia 22307, USA.
Cara C
CC
Powers
Henry
H
Ho
Sarah E
SE
Beykirch
Cathy
C
Huynh
Robert H
RH
Hopper
C Anderson
CA
Engh
Charles A
CA
Engh
D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001672:Biocompatible Materials; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology*; D020959:Polyethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure
D001672:Biocompatible Materials; D020959:Polyethylene