Cementless femoral stem

Summary
The Cone Stem is a cementless, conical femoral stem designed for total hip arthroplasty (THA) in patients with developmental dysplasia of the hip (DDH) who present with a narrow or deformed femoral canal and compromised bone stock. The stem aims to provide reliable diaphyseal fixation and facilitate complex reconstructions.

Details
The implant features a 5° angled conical profile combined with specific surface and geometry elements to enhance primary stability while preserving proximal bone. Its design addresses challenges posed by abnormal canal morphology and limited metaphyseal support, enabling intraoperative anteversion adjustments and secure rotational control.

Key features

• Indication: THA for DDH with narrow or deformed femoral canal and poor bone quality
• Fixation concept: Cementless, diaphyseal‑engaging design for axial and torsional stability
• Geometry: 5° angled conical profile to adapt to deformed canals
• Anti‑rotation: Eight longitudinal ridges for enhanced rotational control
• Cross‑section: Circular section permitting intraoperative anteversion adjustment
• Neck finish: High‑polish neck to reduce impingement risk
• Stem design: Short, bone‑preserving stem suitable for limited proximal bone stock

Clinical applications

• Complex hip reconstruction in developmental dysplasia of the hip (DDH)
• Cases with narrow femoral canals or abnormal canal morphology
• Patients with reduced metaphyseal bone stock where diaphyseal engagement is preferred

Technical specifications

• Implant type: Cementless conical femoral stem (diaphyseal‑engaging)
• Profile: 5° angled conical profile
• Anti‑rotation elements: Eight longitudinal ridges
• Cross‑section: Circular (permits intraoperative anteversion adjustment)
• Neck finish: High‑polish neck
• Stem concept: Short, bone‑preserving design
• Indication summary: THA in DDH with narrow/deformed femoral canal and poor bone quality