Tibial plateau coverage in total knee arthroplasty

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Implant design

Background:

• Achieving optimal tibial plateau coverage is critical for successful total knee arthroplasty (TKA).
• Inadequate coverage can lead to complications and affect implant longevity.
• Tibial tray design significantly influences the degree of coverage achieved.

Purpose of the Study:

• To evaluate and compare the tibial coverage provided by eight different tibial tray designs.
• To determine if symmetric or asymmetric designs offer superior coverage of the resected tibial plateau.
• To identify areas of potential poor coverage with various implant geometries.

Main Methods:

• Analysis of tibial coverage on 35 resected tibial specimens using eight distinct tibial tray designs.
• Measurement of average tibial coverage with and without component overlap (surgical fit).
• Statistical comparison of coverage between symmetric and asymmetric tibial component groups.

Main Results:

• Average tibial coverage ranged from 76.4% to 80.8% without overlap and 78.5% to 85.5% with slight overlap.
• Six symmetric designs provided significantly greater coverage than two asymmetric designs (p < 0.05).
• Specific areas of poor coverage were identified across different tray geometries.

Conclusions:

• Contrary to common assumptions, symmetric tibial components can offer greater coverage than some asymmetric designs.
• Tibial tray geometry is a key factor in optimizing coverage during total knee arthroplasty.
• Symmetric designs may be advantageous for maximizing tibial plateau coverage in TKA.