Prosthetic knee joint
A prosthetic knee joint is the part of an above-knee prosthesis that bends and supports the user's weight in place of the natural knee. It is fitted by prosthetists in rehabilitation centres, limb-fitting clinics and humanitarian programmes.
Common types
- Single axis knee: a simple hinge, often with a manual lock or friction control.
- Polycentric knee: several linked axes, such as a four-bar design, that improve stability and toe clearance.
- Pneumatic knee: an air cylinder that adjusts swing to walking speed.
- Hydraulic knee: a fluid cylinder that controls swing and stance for more active users.
- Microprocessor knee: sensors and a processor adjust resistance during each step.
What to tell us when you ask for a quotation
- Knee type and the user's activity level
- Maximum user weight and build height
- Locking option, stance control and swing control settings
- Connection type (pyramid or thread) and material
- For microprocessor knees: battery life, charger plug type and software
- Quantity, destination country and the delivery terms you want (for example EXW, FOB or CIF).
Documents to ask for
Buyers usually ask for CE marking under the EU MDR or local registration, ISO 13485 for the maker, and ISO 10328 structural test reports; microprocessor knees also need electrical safety reports.
Certificates and registrations belong to the product and its manufacturer. We check them with you against the rules of your market before any order.
Why do some knees have a manual lock?
A manual lock keeps the knee straight during walking and releases for sitting. It suits users who need maximum stability, such as older or first-time users, while knees without a lock allow a more natural gait.
Send us the specification and quantity. We compare manufacturers in China and reply with options, lead times and the documents that come with each product. NJMC sources and checks; it does not manufacture.