Prosthetic Knee Solutions

Prosthetic knees have had some impressive technological enhancements in previous decades and continue to do so. These improvements have helped enhance the functionality and safety of prosthetic knees. Most notably in these improvements is Microprocessor controlled knees (MPK’s). Other mechanical knees use the integration of hydraulic and pneumatic features which allows the knee units to adapt better to real-life situations and environmental changes which is imperative when walking on slopes, stairs, and uneven ground etc.

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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. 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. 

After the above knee amputation, you may feel hopeless because you cannot do what you have already done. With advanced technology, you can go forward to the next level. Many people adapt prosthetics, finding new ways to stay active and live happy lives. Prosthetic knee joints enable movement with confidence and free-flowing natural motion.

If you want to learn more, please visit our website Aosuo Medical.

This blog will explain the types of prosthetic knees, their workings, and essential factors when selecting one. Whether for you or those looking to assist a loved one transitioning in life after the amputation, remember that the right choice of limb enables ease in everyday movements.

What are Prosthetic Knee Joints?

Knee joint is one of the most significant joints in the human body. It links the femur to your tibia, allowing you to stand straight, walk, and even balance yourself. The decision to remove this crucial joint due to above-knee amputation, whether from trauma, diabetes, or other medical conditions, can significantly impact a person’s quality of life. Above-knee amputation impacts mobility and functionality, but prosthetic knees are a game-changer.

Artificial knee joints come equipped with additional capabilities that allow them to deliver the ability to move and incorporate seamlessly back into everyday activities with the confidence to live your own life. See how these technologies transform problems into possibilities for well-being and meaningful life.

What are the 6 Types of Prosthetic Knee Joints

1. Manual locking knee joint: The locking system is stiff and can only be unlocked when a release mechanism is used. It can be more useful in the early stages of rehabilitation to help the user gain more confidence.  
2. Single-axis knee joint: The most common knee joint works in the single-axis when the knee bends and straightens.  
3. Polycentric knee joint: It comforts you with multiple axes of rotation or pivot points that allow for more natural movements.
4. Pneumatic knee joint: It relies on air to assist in flexing and extending muscles at the knee joint. It has an inner piston, while an outer cylinder accommodates air inside. During the piston stroke, it pumps the air, controls the pressure on the knee, and allows the amputee to walk at different speeds.
5. Hydraulic knee joint: This prosthetic knee joints is articulated, and the hydraulic system regulates knee movements. It is an artificial limb that imitates the knee’s functionality. The joint has a piston within a cylinder filled with fluid to stabilize the knee so that it does not swing, and a rubber bumper compresses the stance phase and creates resistance.
6. Microprocessor-controlled knee: This type of artificial knee employs a computer to analyze the users’ requirements and consequently coordinate the knee motion to emulate a regular walk. Usually, it recognizes a misstep and increases the knee’s stiffness, allowing you to traverse terrains. You can control these kinds of microprocessor artificial knees in different ways, such as by controlling the swing phase only, the stance phase only, or both the swing and stance phases.

Top Features and functionalities of the knee joint

• Adjustable flexion and extension: The model is designed for your flexibility requirements.
• Stability mechanisms (stance phase stability): It guarantees stability and helps movement throughout the stance phase.
• Swing phase control: Improves stability and fluidity of the walk during the swing phase.
• Customizable settings for different activities: Innovative and versatile, these settings are suitable for walking, sports, and any other time frame.

Material and Design Considerations Before Choosing One

1. Lightweight materials: Extra options like titanium and carbon fiber ensure the comfort and ease of daily use of the above-knee artificial limb.
2. Durability and weather resistance: They are designed to withstand demanding and challenging climates and deliver optimum performance in any environment.
3. Aesthetic designs: Cosmetically appealing prosthesis that fit specific shapes and sizes perfectly balance form and function for your above-knee artificial leg.

Fitting and Alignment of Prosthetic Knees

• Proper alignment ensures a natural gait and maximum comfort, optimizing the movement of the knee joint when using a prosthetic leg.
• Prosthetists’ expertise is vital for precise fitting and customization, ensuring seamless integration of the knee joint for smooth motion.
• Initial fitting challenges involve fine-tuning the knee joint alignment to overcome discomfort and achieve the perfect fit for a prosthetic leg above knee.

Biomechanics of Artificial Knee Joints

1. Mimicking natural gait: The modern prosthetic knees are designed to approximate the mechanical properties of natural knee joints to facilitate the motion of prosthetic joints.
2. Load distribution and stability: Knee joint movement ensures objects are well distributed in contact and gives support and balance during usage.
3. Impact on hip and ankle joints: Similarly, in the case of an above-knee prosthetic limb, a knee effectively distributes the load from the hip and the ankle, thereby promoting mobility.

Top 3 Benefits of Using Artificial Knee Joints

• Improved mobility and balance: It makes daily movements easier, including walking and climbing stairs.
• Participation in sports and activities: Facilitates running, cycling, or yoga, and other favorite activities and hobbies can be retained.
• Enhancing confidence and quality of life: It boosts confidence by enabling natural, comfortable movement in social settings, allowing you to engage with others effortlessly and focus on the moment.

Conclusion

Amputation alters life, whether the individual desires it or not, and a prosthetic knee joints means getting a do-over. High-tech prosthetic knees combined with professional fitting let you move again, improve your quality of life, and help you feel whole. From walking to all other activities, such prosthetic innovations guarantee that individuals can use every activity without restraint.

KARE Prosthetics and Orthotics Solution

KARE Prosthetics and Orthotics solution provides quality prosthetic and orthotic devices to wear and practice transitioning to the device. Our new technologies ensure you get the mobility aid that suits your way of life. For your prosthetic needs, visit KARE near you for quality health care and services.

We guarantee all your needs and the best care to attain higher mobility and independence. As a team or company, we strive to be your partner in achieving your goals!

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