Wear of highly crosslinked polyethylene acetabular components

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Medical imaging analysis

Background:

• In vivo wear rates of highly crosslinked polyethylene (XLPE) acetabular components vary significantly across studies.
• Measurement techniques and inherent errors complicate accurate wear assessment in XLPE bearings.
• Radiostereometric analysis (RSA) offers the most sensitive method for in vivo wear measurement.

Purpose of the Study:

• To conduct a scoping review of studies measuring in vivo wear of XLPE acetabular components using RSA.
• To synthesize findings on XLPE wear rates in primary total hip arthroplasty (THA).
• To identify limitations in current RSA methodologies and reporting standards.

Main Methods:

• Systematic literature search of PubMed, Scopus, and Cochrane databases.
• Inclusion of studies utilizing RSA for wear measurement in primary THA with XLPE components.
• Analysis of 18 publications encompassing 12 primary THA cohorts.

Main Results:

• Reviewed studies reported mean/median proximal wear rates ranging from 0.00 to 0.06 mm/year.
• Variations in wear determination methods hindered direct study comparison.
• Differences in RSA techniques (radiograph positioning, reference markers) may limit future meta-analyses.

Conclusions:

• This review confirms low in vivo wear rates for XLPE acetabular components in THA, as evidenced by RSA.
• Standardization of RSA wear reporting is recommended for early detection of implant issues.
• Improved reporting will enhance understanding of patient and surgical factors influencing wear.