6- to 10-year experience using countersunk metal-backed patellas

¹Department of Orthopedics, University of Utah Medical Center, Salt Lake City 84132, USA.

|February 1, 1997

Summary

This study found that metal-backed patellar components in total knee arthroplasty demonstrate good long-term survivorship and functional outcomes. Proper surgical technique and component alignment are crucial for successful results in knee replacement surgery.

Area of Science:

Orthopedic Surgery
Biomaterials Engineering
Clinical Outcomes Research

Background:

Cementless total knee arthroplasty (TKA) is a common procedure for knee osteoarthritis.
Patellar component fixation is critical for long-term TKA success.
Metal-backed, porous-coated patellar components are utilized to promote osseointegration.

Purpose of the Study:

To evaluate the long-term outcomes of cementless total knee arthroplasties using a specific metal-backed, porous-coated patellar component.
To assess the survivorship and functional results of this patellar component design.
To identify factors influencing the success of metal-backed patellar components in TKA.

Main Methods:

Retrospective analysis of 302 consecutive cementless TKAs using a metal-backed, porous-coated patellar component.
Patient follow-up ranged from 6 to 10 years, with 212 knees available for evaluation.
Assessment of clinical outcomes using the modified Hospital for Special Surgery (mHSS) total knee score, and evaluation of patellar component stability through measurements of translation and tilt.

Main Results:

Mean mHSS score improved significantly from 58 pre-operatively to 98 post-operatively.
Mean patellar translation was 2.75 mm and mean tilt was 3.5 degrees, indicating good stability.
Overall patellar survivorship was 96%, with 5% of patients (11 knees) requiring revision of the patellar component due to loosening or other complications.

Conclusions:

Metal-backed, porous-coated patellar components can achieve favorable long-term results in cementless total knee arthroplasty.
Careful attention to component design, surgical technique, and precise patellar alignment is essential for optimal outcomes.
This component design offers a viable option for patellar resurfacing in TKA, with a low rate of revision.

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6- to 10-year experience using countersunk metal-backed patellas

Area of Science:

Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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