Product Overview
The Spherocentric Patellofemoral Prosthesis is designed to replace worn joint surfaces with minimal bone resection. It includes a trochlear casing and a trochlear button with congruent geometric shapes, ensuring that all pressure forces are applied to the geometric center of the sphere.

Design and Compatibility
The patellar casing is crafted from a chromium-cobalt alloy and features minimal inter-condylar clearance, making it compatible with a unicompartmental prosthesis. It can be implanted without cement due to an anchoring system with two upper stabilization tips and one lower tip for stable anchoring. The asymmetrical design of the casing aligns with knee anatomy, reducing the risk of patella dislocation.

Functional Features
The upper part of the patellar casing is designed to engage the patella button in its extension position, eliminating pivot shifts and subluxations between 0 and 30 degrees of flexion. The patella button's spherical shape complements the patellar casing, forming an autostable spherocentric system.

Product Specifications
The document lists specific references for trochlear and patellar implants, available in sizes S, M, and L for both left and right sides.

Manufacturer Information
Aston Medical, located in Saint-Etienne, France, provides contact details for further inquiries. The document notes that it has no contractual validity and is not available for the US market.