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Item #: 3R85
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User profile:

  • Suitable for K3 and K4 patients
  • Max. patient weight: 220 lbs / 100 kg
  • Transfemoral amputation, Knee disarticulation, Hip disarticulation, Bilateral

Product description:

  • Monocentric knee joint with patented rotary hydraulic to control stance and swing phase
  • Default Stance design: Dynion progressively responds to ground reaction forces ensuring a stable stance.
  • Swing is initiated upon successfully meeting the disengagement criteria.
  • Stance resistance activated by foot load or interruption of swing.

Key Features:

Default stance
Dynion is default stance with active stance resistance during swing phase extension.

A Powerful, rotary hydraulic
Provides dynamic, dependable control throughout the gait cycle (both stance and swing phase).

Consistent, adjustable, stance flexion resistance
Provides support when going down stairs (step-over-step), ramps and other descents.

Shallow incline advantage
Hyper-extension at the control axis during terminal stance emulates dorsi flexion at the foot.

Knee extension assist
The knee extension assist spring promotes variable cadence and a more secure loading condition.

Stance and swing extension dampening
Dynion uses a combination of hydraulic fluid regulation, extension stop bumpers and an extension spring to control stance and swing extension. Hydraulic fluid flows through three distinct channels: a stance flexion channel, a swing flexion channel and the third stance and swing extension channel. In the last 35 degrees of extension (both stance and swing), the adjustable extension channel narrows (via an individual valve), increasing resistance which provides a dampening effect.

Protected against fresh, salt, and chlorinated water.

Manual lock
Optional manual lock supports effortless standing via an easy access button.

Bicycle mode
Enables free swing mode for bicycling via an easy access button.

Anterior adjustment panel
Convenient access to settings. Two settings for stance and two settings for swing phase with easy and independent adjustment for flexion and extension resistance.

2R37 waterproof tube adapter included in scope of delivery



Material Aluminum
Distal Connection Tube Clamp (30 mm)
Proximal Connection Pyramid Adapter
Knee flexion angle 145 degrees
System height 231 mm
Proximal build height to alignment reference point 44.5 mm
Distal build height to alignment reference point 172 mm
Weight 1240 g
Scope of delivery 2R37 Tube Adapter (30 mm), Instructions for Use
Maximum Body Weight 220 lbs (100 kg)


Refine results

3R85 - Quick Reference Guide

Product Information

PDF Document | Published: May 6, 2022

3R85 - Knee Solutions Brief

Product Information

PDF Document | Published: Mar 1, 2023

3R85 Dynion Instructions for Use (English)

Instructions for Use

PDF Document | Published: Feb 21, 2023

3R85 Dynion Instructions for Use (Spanish)

Instructions for Use

PDF Document | Published: Feb 21, 2023

3R85 Dynion Instructions for Use (French)

Instructions for Use

PDF Document | Published: Feb 28, 2023

3R85 Dynion Justification


PDF Document | Published: Apr 17, 2023

Ottobock Mechanical Knees Brochure


PDF Document | Published: Jun 7, 2023