The Symphony Knee’s innovative 6-Bar polycentric structure provides an extremely high level of stability during the stance phase, combining with a unique hydraulic cylinder to create a super smooth swing phase. The built-in mechanical sensor allows the knee to control the stability of the knee joint automatically. Creating a smooth, comfortable, confident gait is what the Symphony Knee is all about!
Key Features and Performance of the Symphony Knee
- 6-Bar design creates geometric stability
- Adjustable stance flexion creates a more comfortable gait cycle
- Hydraulic cylinder design makes it easier to initiate a step
- Easy-to-access user-adjustable manual lock helps on uneven ground
- Low build height fits into most transfemoral prostheses
- A maximum flexion angle of 170° makes bending the knee a breeze
- Optional selective lock mechanism ideal for new patients
Safe & Easy to Use
The p-MRS (Polycentric-Mechanism of Reaction force Sensing) system utilizes an innovative mechanical sensor designed to optimize the polycentric linkage system. The sensor detects the position of the ground reaction force around the sensing point and automatically controls the knee’s stability.
1. Heel Contact
The p-MRS System immediately locks the knee joint geometrically for the user’s safety, while allowing for the appropriate amount of stance flexion to provide comfortable walking. The amount of stance flexion is adjustable according to each person’s gait.
2. Terminal Stance
When the p-MRS System detects force at the toe, the knee joint naturally releases the geometric lock and smoothly shifts to the swing phase. No special gait training is required for the user to release the lock.
3. Swing Phase
A compact and powerful hydraulic cylinder naturally responds to various walking speeds. At the pre-swing phase, the swing is initiated very lightly compared with conventional hydraulic knees. The adjustable spring extension assist helps to keep full extension at the end of the gait cycle.
Patient Testimonial
“I lost my leg in the early 90s from a houseboat accident. There was a very long period in the beginning where I just couldn’t do everything I liked to do before, like biking, running, and exercising. I knew I would be able to do them eventually, it just wasn’t as easy as it used to be.”
“I want to keep up with my boys, workout, and go golfing. I like that it has a manual lock feature--it is just a very stable knee. I can do whatever my family does now.”
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