Minimum 20-year follow-up of a press-fit acetabular cup in cementless total hip replacement in young patients

We aimed to determine the minimum 20-year survival rates of a cementless press-fit cup in young patients. This is a retrospective, single-center, multi-surgeon cohort study investigating the minimum 20-year clinical and radiological outcome of the first 121 consecutive total hip replacements (THRs)...

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Published in:Acta orthopaedica 2023-07, Vol.94, p.321-327
Main Authors: Lunz, Andre, Von Falkenhayn, Moritz, Jaeger, Sebastian, Reiner, Tobias, Merle, Christian, Streit, Marcus R, Renkawitz, Tobias, Innmann, Moritz M
Format: Article
Language:English
Subjects:
Adult
Allofit
arthroplasty
Arthroplasty, Replacement, Hip - adverse effects
cementless fixation
Cohort Studies
Follow-Up Studies
Hip Prosthesis - adverse effects
Humans
implant survival rates
long-term outcome
Metals
Middle Aged
Osteolysis
Polyethylene
press-fit cup
Prosthesis Design
Prosthesis Failure
Reoperation
Retrospective Studies
Young Adult
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Summary:We aimed to determine the minimum 20-year survival rates of a cementless press-fit cup in young patients. This is a retrospective, single-center, multi-surgeon cohort study investigating the minimum 20-year clinical and radiological outcome of the first 121 consecutive total hip replacements (THRs) using a cementless, press-fit cup (Allofit, Zimmer, Warsaw, IN, USA) performed between 1999 and 2001. 28-mm metal-on-metal (MoM) and ceramic-on-conventionally not highly crosslinked polyethylene (CoP) bearings were used in 71% and 28%, respectively. Median patient age at surgery was 52 (range 21-60) years. Kaplan-Meier survival analysis was conducted for different endpoints. The 22-year survival rate for the endpoint aseptic cup or inlay revision was 94% (95% confidence interval [CI] 87-96) and 99% (CI 94-100) for aseptic cup loosening. 20 patients (21 THRs; 17%) had died and 5 (5 THRs; 4%) were lost to follow-up. No THR showed evidence of radiographic cup loosening. Osteolysis was observed in 40% of THRs with MoM and 77% with CoP bearings. 88% of THRs with CoP bearings showed significant polyethylene wear. The investigated cementless press-fit cup, which is still in clinical use today, showed excellent long-term survival rates in patients under the age of 60 years at surgery. However, osteolysis due to polyethylene and metal wear was frequently observed and is a matter of concern in the third decade after surgery.
ISSN:1745-3674
1745-3682
DOI:10.2340/17453674.2023.13385