Simple Anatomical Fixed-Bearing Unicondylar Knee

Name: Unicompartmental Knee Joint System,Medical Device Manufacturers -Double Medical
Brand: Knee

The Simple Anatomical Fixed-Bearing Unicondylar Knee is a next-generation prosthetic system designed for unicompartmental knee arthroplasty. It restores natural joint kinematics by closely matching the patient's native femoral and tibial anatomy. The fixed-bearing design provides excellent primary stability, reduces wear risk associated with moving components, and minimizes bone resection. This implant is indicated for patients with isolated medial or lateral compartment osteoarthritis, post‑traumatic arthritis, or osteonecrosis limited to a single condyle.

Product Detail

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°).