Unicondylar knee prosthesis: our experience

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering

Background:

• Unicompartmental knee arthroplasty (UKA) is an alternative to total knee replacement.
• Tibial component design, specifically all-polyethylene versus metal-backed, may influence clinical outcomes.

Purpose of the Study:

• To compare the clinical and functional outcomes of UKA using all-polyethylene tibial components versus metal-backed tibial components.

Main Methods:

• Prospective evaluation of 50 patients undergoing UKA.
• Patients were divided into two groups: Group A (all-polyethylene Mitus prosthesis) and Group B (metal-backed Allegretto prosthesis).
• Follow-up was 36 months, with evaluations using the Knee Society Score and range of motion (ROM).

Main Results:

• Both groups showed significant improvement in Knee Society Scores post-operatively (Group A: 48 to 95, Group B: 49 to 94).
• Post-operative ROM was comparable, averaging 125 degrees for Group A and 130 degrees for Group B.
• No statistically significant differences were observed between the two implant types.

Conclusions:

• All-polyethylene and metal-backed tibial components demonstrate similar clinical and functional results in UKA.
• Careful patient selection and accurate component positioning are crucial for successful UKA outcomes.
• The minimum thickness for all-polyethylene components should exceed 6 mm.