5 Reasons Why Your Business Needs polycentric pneumatic knee joint？

Overview of Knee Joint Types

What are Single-Axis Knee Joints?

Single-axis knee joints are designed with a simple hinge mechanism that allows movement in a single plane. This makes them straightforward to use, offering stability during walking and standing. They are commonly used in lower-level amputees who require dependable leg movement without excessive complexity.

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What are Polycentric Knee Joints?

Polycentric knee joints consist of multiple pivot points, allowing for a more natural knee motion. This design supports a greater range of movement and can better mimic the function of a biological knee, making it ideal for more active users or those with higher mobility needs.

Core Parameter Comparison

Technical Specifications of Each Joint Type

Parameter Single-Axis Knee Joint Polycentric Knee Joint Weight Lightweight Heavier due to complex components Range of Motion Limited Extensive Stability High Moderate to High Cost Lower Higher Use Case Basic mobility Active lifestyle

Real User Experiences

Battery Life and Performance

Single-axis joints typically do not require batteries, contributing to their reliability and ease of use. In contrast, many advanced polycentric knee joints use electronic components that may require regular charging, impacting overall performance and dependability.

Stability in Different Conditions

Users have reported that single-axis knee joints provide exceptional stability during walking on flat surfaces, while polycentric joints offer better adaptability on uneven terrains, providing a smoother walking experience in dynamic environments.

Advantages and Disadvantages

Pros and Cons of Each Joint

Single-Axis Knee Joints

• Pros: Simplicity, cost-effectiveness, high stability during stationary activities.
• Cons: Limited range of motion and not suitable for active or complex activities.

Polycentric Knee Joints

• Pros: Natural movement, extensive range of motion, better suited for active lifestyles.
• Cons: Higher cost, potential maintenance needs, and battery dependency.

Recommendations for Different User Groups

Who Should Choose Each Type?

Single-axis knee joints are best suited for users with lower activity levels, those who prioritize stability and simple design, and individuals in need of a cost-effective solution. In contrast, polycentric knee joints are recommended for active individuals, sports enthusiasts, or those seeking to regain a normal gait pattern after amputation.

Conclusion

Single Axis and Multi-Axis Knees

The primary difference between prosthetic knees is whether they are single or multi-axial, which means they have a single hinge point or at multiple hinge points. Single Axis is the most common prosthetic knee joint. The majority of microprocessor knees as single axis. Multi axial knees (polycentric knees) can shorten the prosthesis when in swing, reducing the risk of tripping and falling. Polycentric knee units can meet the needs of various users from low to high activity.

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Chelated Micronutrient Fertilizer

These are also a good option for people with long residual limbs, so the prosthetic knee does not stick our further than the sound side in sitting.

Some of our designs such as our recreational limb was put together for a client that has dreams about hitting the slopes and waves with their prosthesis.

Controlling a Prosthetic Knee

Prosthetic knees use a variety of strategies to control the way the knee behaves. Pneumatic knees use air to adapt their function such as when walking at different walking speeds. Hydraulic knees use fluid to adapt their function. Other varieties can utilise a combination of springs, friction and/or locks to control the function of the knee in a more basic way.

Not all knees use microprocessors and sensors to vary their function. These rely solely on alignment and the user to ensure the knee works correctly at different stages of walking.

Microprocessor Controlled Knees

MPK’s use a computer and input from various sensors to continually change and optimise the knee function. These technological inclusions allow the knee to better adapt to real-life situations and environmental changes, allowing improved safety and function. Additionally, MPK’s have intuitive functions for going up and own stairs and ramps. MPKs can be programmed to specific activities such as cycling and running. Microprocessor knees can be heavier than mechanical knees and require charging. 

MPK’s are a great prosthetic knee for the appropriate person but are not appropriate for all users. Your prosthetist will work closely with you to find the most appropriate prosthetic knee based on your level of amputation, functional capabilities, goals, and activities that you enjoy. 

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