The Libertas® HA Stem is designed to deliver immediate mechanical stability followed by durable biological integration. Built on a titanium alloy platform and enhanced with plasma-sprayed hydroxyapatite, this stem is engineered to optimize cancellous bone compression while supporting long-term fixation.
It is a fixation strategy built around bone response.
Libertas® HA Uncemented Stem
Biological Fixation. Mechanical Stability. Engineered for Long-Term Performance.
Overview
Why Hydroxyapatite (HA)
Hydroxyapatite is chemically similar to the mineral component of human bone. When applied to a titanium substrate, it provides a biologically active surface that encourages rapid bone ongrowth.
The Libertas HA Stem utilizes Hydroxyapatite coating, creating a surface designed to accelerate biological fixation while maintaining strong mechanical adhesion to the implant.
Coating specifications include:
- Surface roughness: Rt > 30 μm
- Coating thickness: 150 ± 40 μm
- Adhesion strength: ≥ 15 MPa
- Crystallinity: ≥ 60%
Design Features That Support Fixation
The HA coating works in combination with deliberate stem geometry to support mechanical stability at the time of implantation.
- Trapezoidal cross section designed for initial stability
- Rectangular distal geometry designed for rotational stability
- Vertical grooves to enhance axial and rotational fixation
- Step design to maximize compression loading in cancellous bone
- Lateral shoulder designed for ease of insertion
- Tapered neck to increase range of motion
Implant Options
The Libertas HA Stem is available in:
3 Offset Options to facilitate restoration of hip biomechanics
33 stem sizes to accommodate a wide range of femoral anatomies
Collared and collarless configurations
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