The X4 knee joint adopts a unique humanoid knee joint locking function, allowing patients to ensure safety during walking, just like the human knee joint, when landing and supporting their heels. When the foot is lifted, the knee joint simulates the physiological function of the human knee joint and easily and naturally unlocks knee flexion walking.

Characteristics:
1. During walking, knee flexion from 0 to 15 degrees can be provided to absorb shock, increasing the comfort and aesthetics of patients during walking. Especially when users walk on complex roads such as downhills, they can fully utilize the unique EBS (Elastic Bending Service) function to bring you a harmonious and relaxed natural gait. The EBS function also eliminates the impact of the ground on the residual limb during walking, making walking more comfortable.

2. The extended high-power dual cylinder function can adjust the stretching resistance and bending resistance according to individual differences, thereby reducing physical energy consumption, improving walking gait, and enhancing the user's walking ability.

3. The multi axis design provides balanced distribution of rotational bearing load during walking support, greatly extending the service life of the joint body.
 4. The precision manufacturing design of fully sealed needle roller bearings is different from the ball bearings or sleeve type designs currently available in the market.

5. Suitable for users with heavy weight and high labor intensity, with a maximum load capacity of 136KG.
 6. The humanized large knee bending angle design provides convenience for users.
 ① About Assembly
Due to the fact that all components of the USMC knee joint are assembled with screws or nuts, the assembly can be completed by pairing the matching components and then locking and fixing the screws or nuts.
 ② Joint adjustment
Depending on the user's ability to move, adjusting the pneumatic knee joint by momentarily rotating the adjustment screw can change joint sensitivity. Adjusting the regulating valve on the knee joint pressure body can increase or decrease the speed of joint bending or stretching.

Product	Material	Weight	Amputation Level
X4	Aviation Aluminum Alloy	999g	AK
Maximum Weight	Maximum Angle	Axle	行动力等级
136KG	145°	Multiaxis	Ⅱ/Ⅲ