The Polycentric Pneumatic Knee Joint is engineered to provide stable stance, controlled knee movement, and smooth swing phase performance for individuals using lower limb prostheses. Combining a polycentric (multi-axis) linkage with a precision pneumatic damping system, the joint delivers controlled flexion and extension throughout the walking cycle.

Its lightweight high-strength aluminum body, steel load-bearing components, and precision-engineered internal mechanism make it suitable for everyday prosthetic use while maintaining durability and consistent performance.

Key Benefits

• Polycentric multi-axis knee design
• Pneumatic damping for controlled swing phase
• Stable stance during walking
• Independent flexion and extension adjustment
• Soft-close extension mechanism
• Lightweight yet durable aluminum construction
• Steel pyramid adapter and shafts
• PTFE washers for reduced friction
• Needle roller bearings for smooth articulation
• Up to 165° knee flexion
• ISO 10328:2016 tested
• Maximum user weight: 125 kg

Advanced Features

Polycentric Multi-Axis Design

The multi-axis linkage is designed to improve stance stability while supporting smooth and controlled knee movement throughout the gait cycle.

Pneumatic Damping System

The integrated pneumatic damping system regulates the swing phase by controlling both flexion and extension, helping produce predictable knee movement during walking.

Independent Adjustment

Separate flexion and extension adjustments allow prosthetists to fine-tune the knee joint according to individual user requirements.

Soft-Close Extension Mechanism

The soft-close extension mechanism helps minimise terminal impact when the knee reaches full extension, supporting smoother movement.

High-Strength Aluminum Body

Manufactured from high-strength aluminum, the body provides lightweight performance while maintaining structural durability for daily prosthetic use.

Steel Pyramid Adapter and Shafts

Steel pyramid adapters and shafts enhance load-bearing strength and contribute to reliable mechanical performance.

PTFE Washers

PTFE washers reduce friction between moving components, supporting smoother articulation and helping minimise wear.

Needle Roller Bearings

Needle roller bearings provide smooth, consistent movement and contribute to long-term durability.

Up to 165° Flexion

The knee joint allows up to 165° of flexion, supporting a wide range of movement for daily activities.

Integrated Thread-Locking System

Integrated thread-locking on all fasteners helps maintain secure assembly during prolonged use.

Tested for Reliability

The Polycentric Pneumatic Knee Joint has been tested according to ISO 10328:2016, demonstrating compliance with internationally recognised structural testing requirements for lower limb prosthetic components.

Specifications