Highly crosslinked polyethylene is safe for use in total knee arthroplasty

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Medical Device Engineering

Background:

• Highly cross-linked polyethylene (XLPE) is utilized in hip arthroplasty to minimize wear.
• Concerns exist regarding XLPE's reduced fracture toughness for total knee arthroplasty (TKA) applications.
• Investigating the safety of XLPE in TKA is crucial for patient outcomes.

Purpose of the Study:

• To evaluate the safety and efficacy of highly cross-linked polyethylene (XLPE) in total knee arthroplasty (TKA).
• To compare radiographic outcomes and revision rates between XLPE and standard polyethylene TKA implants.

Main Methods:

• Retrospective review of 100 TKA subjects receiving XLPE and 100 receiving standard polyethylene.
• Radiographic analysis to assess radiolucencies and component loosening.
• Comparison of follow-up periods, mean ages, and revision causes between the two groups.

Main Results:

• The standard polyethylene group showed 20 TKAs with radiolucencies, including 4 with tibial loosening, and required 3 revisions for loose tibial components.
• The XLPE group had only 2 TKAs with radiolucencies and no evidence of tibial loosening.
• No reoperations for osteolysis were reported in the XLPE group.

Conclusions:

• Highly cross-linked polyethylene (XLPE) appears to be a safe option for total knee arthroplasty (TKA) in the short- to midterm.
• XLPE demonstrated superior radiographic outcomes compared to standard polyethylene in TKA.
• Further long-term studies are warranted to fully establish the durability of XLPE in TKA.