Prosty anatomiczny kolano unikondylowe z nieruchomym łożyskiem

Features of Fixed-Bearing Unicondylar Knee

• Curved Concave Surface The femoral condyle incorporates a curved concave surface with a large radius of curvature, promoting even load distribution across the meniscal insert and maintaining a relatively consistent contact area throughout flexion and extension.
• Dual-Post Design The dual-post design enhances rotational stability and improves stability during high-flexion activities by engaging with corresponding recesses on the femoral component.
• Unconstrained Motion The design allows a controlled range of varus-valgus angulation (typically 3–5°), accommodating natural ligament laxity and reducing edge-loading.
• Symmetrical Design The femoral condyle prosthesis is symmetrically designed and can be used for both medial and lateral applications. (Note: The tibial tray side-specific to match anatomical asymmetry.)

Indications of Fixed-Bearing Unicondylar Knee

• Disease confined to a single compartment, with intraoperative and imaging confirmation that the contralateral compartment has no full-thickness cartilage wear or severe destruction.
• Anteromedial osteoarthritis (AMOA): The anterior cruciate ligament (ACL) is functionally intact, and the wear is localized to the anteromedial tibial tray. This is the most typical ideal indication for fixed-bearing UKA.
• Age and activity level: Age usually ≥ 60 years, with low to moderate activity demands. Younger or more active patients are not an absolute contraindication, but require thorough discussion and careful patient selection.
• Body weight and obesity: Body weight ≤ 82 kg (180 lbs) is the classic standard. Modern opinion holds that BMI > 30 kg/m² is not an absolute contraindication, but overall health and activity level must be assessed; obesity increases postoperative risks.
• Preoperative knee range of motion: Flexion ≥ 90°, fixed flexion deformity (extension deficit) ≤ 10° (classic standard ≤ 5°).

Simple Anatomical Fixed-Bearing Unicondylar Knee Video

Simple Anatomical Fixed-Bearing Unicondylar Knee Brochure PDF