Price on request
KX07
Hydraulic and pneumatic knees. A waterproof four-bar polycentric knee with hydraulic swing and stance control.
Ottobock
Photo could not be loaded
Ottobock · Hydraulic and pneumatic knees · PR-025
Ottobock 3R80 Modular Rotary Hydraulic Knee Joint
The Ottobock 3R80 Modular Knee Joint is a single-axis prosthetic knee that uses rotary hydraulics to control stance and swing across different walking speeds. The aluminium joint is waterproof and corrosion resistant in fresh, salt and chlorinated water. It carries up to 150 kg, flexes to 150 degrees and comes with either a pyramid or a threaded proximal connection.
- Mobility grade
- 3 to 4
- Max body weight
- 150 kg (330 lb)
- Knee flexion
- 150 degrees
- Weight
- 2.73 lb (pyramid); 2.77 lb (threaded)
Ottobock 3R80 Modular Knee Joint key features
- Rotary hydraulics control stance and swing
- Usable in fresh, salt and chlorinated water
- Pyramid or threaded (ST) proximal connection
- Distal tube clamp of 34 mm diameter
- Aluminium construction
- Weighs 2.73 lb, or 2.77 lb threaded
Who the Ottobock 3R80 Modular Knee Joint suits
Built for highly active transfemoral users in mobility grades 3 and 4, including heavier users up to 150 kg and people who swim or work around water. A prosthetist chooses the connection version and sets it up.
This kind of device is prescribed and fitted by a clinician. An enquiry starts that conversation. It is not a purchase.
Figures for comparing
- Weight
- 1.2 kg (2.6 lb)
- Max user weight
- 150 kg (331 lb)
The same units on every product, converted from the specifications below. Where a source gives two limits, the lower one is shown.
Ottobock 3R80 Modular Knee Joint specifications
| Mobility grade | 3 to 4 |
|---|---|
| Max body weight | 150 kg (330 lb) |
| Knee flexion | 150 degrees |
| Weight | 2.73 lb (pyramid); 2.77 lb (threaded) |
| Build height | 8 1/2 in |
| System height | 6 7/16 in (pyramid); 7 1/16 in (threaded) |
| Material | Aluminium |
| Water use | Fresh, salt and chlorinated water |
| Distal connection | Tube clamp, 34 mm |
| Maker country | Germany |
| Price | Quoted on request |
| Brand | Ottobock |
| Category | Lower limb - knees, hips and leg systems, Hydraulic and pneumatic knees |
| Catalog ID | PR-025 |
Compared with the source page on 5 October 2026. Details can change, so we confirm them in your quote. Open the source page.
Ottobock 3R80 Modular Knee Joint: common questions
Can the Ottobock 3R80 go in the sea or a pool?
Yes. Ottobock states it is waterproof and corrosion resistant in fresh, salt and chlorinated water.
What is the weight limit of the 3R80?
The maximum body weight is 150 kg, which is 330 lb.
Which connections does the 3R80 come with?
There is a pyramid version and a threaded connector (ST) version. Both have a 34 mm tube clamp at the bottom.
How to get a quote for the Ottobock 3R80 Modular Knee Joint
Add it to your enquiry list
Press Add to enquiry. You can add other products and parts to the same list.
Tell us your country and needs
Send the list with your country, sizes and any options you want. No payment details are asked.
Get a personal reply
You receive availability, a price and delivery options by email, and decide after that.
Similar to the Ottobock 3R80 Modular Knee Joint
All Lower limb - knees, hips and leg systemsPrice on request
Capital Knee
Hydraulic and pneumatic knees. A single-axis hydraulic knee with swing and stance control and a mode switch.
USD 1,035 (maker's listed price)
All-Terrain Knee
Mechanical knees. A waterproof four-bar mechanical knee with an automatic stance lock and non-hydraulic cadence control.
Price on request
ESK+
Mechanical knees. A knee with weight-activated stance control and adjustable pneumatic swing control.
Goes with this product
Guides for this kind of product
Money & Funding · 8 min read
What a prosthetic leg really costs and who pays
A prosthetic leg is a fitted service, not a boxed product. Here is what the bill is made of and which funding routes to ask about first.