Minimum 10-Year Outcomes of Total Hip Arthroplasty With Highly Cross-Linked Polyethylene in Patients Under 50 Years:
Zachary D Randall1, Mitchell S Mologne2, Dominic Gaziano2
1Department of Orthopaedic Surgery, University of California Davis, Sacramento, California.
Insights
Total hip arthroplasty (THA) with highly cross-linked polyethylene (HXLPE) shows excellent outcomes in patients under 50. This approach minimizes wear and revision rates, enhancing implant longevity for younger, active individuals.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Arthroplasty Research
Background:
- Total hip arthroplasty (THA) utilization is rising in younger populations (<50 years).
- Younger THA patients face higher long-term risks of complications and revisions.
- Highly cross-linked polyethylene (HXLPE) offers reduced wear and osteolysis compared to conventional polyethylene.
Purpose of the Study:
- To systematically review and meta-analyze THA outcomes using HXLPE in patients under 50.
- To assess clinical and radiographic results at a minimum 10-year follow-up.
- To evaluate the impact of HXLPE on implant longevity in young, active individuals.
Main Methods:
- Systematic review and meta-analysis following PRISMA guidelines.
- Searches across Embase, Ovid Medline, Scopus, and Cochrane databases.
- Inclusion of 18 studies (1,587 hips) with mean follow-up of 14.1 years; quality assessed by MINORS criteria.
Main Results:
- Revision-free survivorship was 98% with a mean Harris Hip Score improvement of 43.7 points.
- Pooled linear wear rate was 0.024 mm/year, well below the osteolysis risk threshold.
- Wear rates remained low irrespective of femoral bearing material or size.
Conclusions:
- THA with HXLPE in patients ≤50 years demonstrates excellent clinical and radiographic outcomes.
- Minimal polyethylene wear is observed up to 20 years postoperatively.
- HXLPE use in young patients supports enhanced wear parameters and revision-free survival.
Background:
Total hip arthroplasty (THA) is increasing in utilization among young patients. While THA markedly improves outcomes in those who have degenerative hip disease, patients under 50 years face an extended lifetime risk for complications and revisions. Highly cross-linked polyethylene (HXLPE) is associated with reduced wear, revision rates, and osteolysis compared to conventional polyethylene, potentially enhancing implant longevity in this younger, active population. This study systematically reviewed and meta-analyzed the outcomes of THA using HXLPE in patients under 50 years of age at a minimum 10-year follow-up.
Methods:
A systematic review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Searches were performed in Embase, Ovid Medline, Scopus, and Cochrane databases. Inclusion criteria targeted studies with patients under 50 years reporting original data on THA using HXLPE with a mean follow-up of ≥ 10 years. Data extraction was performed independently by two reviewers, and study quality was evaluated using the Methodological Index for Non-Randomized Studies (MINORS) criteria. Multiple random-effects meta-analyses were performed to summarize outcomes. There were 18 studies included (n = 1,587 hips) with a weighted mean follow-up of 14.1 years.
Results:
Overall, revision-free survivorship was 98%, and the weighted mean improvement in Harris Hip Score was 43.7 points. A random-effects meta-analysis yielded a pooled linear wear rate of 0.024 mm/year (95% confidence interval [CI]: 0.013 to 0.035). All wear rates remained well below the 0.1 mm/year threshold associated with osteolysis risk, regardless of femoral bearing material or size.
Conclusions:
Total hip arthroplasty using HXLPE in patients aged ≤ 50 years yields excellent clinical and radiographic outcomes with minimal wear observed up to 20 years postoperatively. Importantly, these benefits are largely maintained regardless of the femoral head bearing material or size. These findings support the continued use of HXLPE among young patients to maximize wear parameters and revision-free survival.
