Surgeons performed more than 1.1 million joint replacements in the US in 2011. That same year, the International Consortium of Orthopaedic Registries (ICOR) was launched to help close gaps in evidence and data collection related to orthopaedic implants. The ICOR network now consists of more than 70 stakeholders and more than 30 orthopaedic registries representing 14 nations.
The December 17, 2014 edition of The Journal contains an online supplement with 14 articles highlighting the achievements of international registries and the findings from 12 ICOR-initiated registry studies. The first article in the supplement (National and International Postmarket Research and Surveillance Implementation) summarizes the findings from the 12 registry studies. The second article (A Distributed Health Data Network Analysis of Survival Outcomes) provides an overview of the data extraction processes and analytic strategies used in the studies.
Key findings from the 12 studies contained in the supplement:
- Effect of Femoral Head Size on Metal-on-HXLPE Hip Arthroplasty Outcome in a Combined Analysis of Six National and Regional Registries
There were no differences in revision risk when metal-on-HXLPE (highly cross-linked polyethylene) implants with larger and smaller femoral head sizes were compared.
- Risk of Revision Following Total Hip Arthroplasty: Metal-on-Conventional Polyethylene Compared with Metal-on-Highly Cross-Linked Polyethylene Bearing Surfaces
Non-cross-linked polyethylene was not associated with significantly worse revision outcomes when compared with metal-on-HXLPE.
- Distributed Analysis of Hip Implants Using Six National and Regional Registries: Comparing Metal-on-Metal with Metal-on-Highly Cross-Linked Polyethylene Bearings in Cementless Total Hip Arthroplasty in Young Patient
Large-head-size metal-on-metal implants were associated with increased risk of revision after two years, compared with metal-on-HXLPE implants.
Use of ceramic-on-ceramic implants with a smaller head size was associated with a higher revision risk compared with metal-on-HXLPE implants and ceramic-on-ceramic implants with head sizes >28 mm.
- Multinational Comprehensive Evaluation of the Fixation Method Used in Hip Replacement: Interaction with Age in Context
When compared with hybrid fixation, cementless fixation was associated with an approximately 58% higher risk of revision surgery in patients aged 75 years or older.
- International Comparative Evaluation of Knee Replacement with Fixed or Mobile Non-Posterior-Stabilized Implants
Mobile-bearing, non-posterior-stabilized knee designs presented a 40% higher risk of failure than that found with fixed-bearing, non-posterior-stabilized designs.
- International Comparative Evaluation of Knee Replacement with Fixed or Mobile-Bearing Posterior-Stabilized Prostheses
Compared with fixed-bearing posterior-stabilized knee prostheses, patients who received mobile bearings had an 85% higher chance of revision within the first postoperative year.
- International Comparative Evaluation of Fixed-Bearing Non-Posterior-Stabilized and Posterior-Stabilized Total Knee Replacements
Fixed non-posterior-stabilized (cruciate-retainin0 TKA performed better (with or without patellar resurfacing) than did fixed posterior-stabilized (cruciate-substituting) TKA.
- Survivorship of Hip and Knee Implants in Pediatric and Young Adult Populations: Analysis of Registry and Published Data
Reported revision rates of TKA and THA among pediatric and young-adult patients is currently similar to that for older patients, but the dearth of data makes it incumbent on registries to continue collecting and analyzing data relevant to younger populations.
This systematic review and meta-analysis concluded that surgeons performing a primary THA should use an implant that outperforms benchmarks established by the UK’s National Institute for Health and Care Excellence (NICE).
- Review of Clinical Outcomes-Based Anchors of Minimum Clinically Important Differences in Hip and Knee Registry-Based Reports and Publications
Among 19 registry reports and 1052 articles examined, only one report and two studies mentioned patient-reported outcome measures (PROMs) and minimum clinically important differences in connection with revision rates after TKA or THA.
- Implementation of Patient-Reported Outcome Measures in U.S. Total Joint Replacement Registries: Rationale, Status, and Plans
Successful collection of PROM data is possible with careful attention to selection of outcome measure(s) and minimizing the data-collection burden on physicians and patients.