Prosthetic Knee Joints

See the Documents & Presentations (to the right), to view presentations, selection charts, and other related information.

Also see Otto Bock's Knee Select app, at

3R-33 Lock Knee (Otto Bock)

3R-33 Lock Knee

A titanium single-axis knee with manual lock, has extension assist.

Otto Bock's information page:



3R-49 Safety Knee (Otto Bock)

3R-49 Safety Knee

A single-axis constant friction with weight activated brake and extension assist.

Otto Bock's information page:



3R-60 (Otto Bock)

3R-60 Knee

A polycentric knee, allowing up to 15 degrees of knee flexion during early stance, for a more comfortable transition to stance phase.

Otto Bock's information page:



3R-80 (Otto Bock)

3R-80 Knee

A rotary hydraulic knee with control over swing and stance phases, including stance phase flexion damping.

Otto Bock's information page:


3R-90 / 3R-92 (Otto Bock)

3R-90 and 3R-92 Knees

Modular knee units with friction braking mechanisms, which engage with weight bearing to prevent knee flexion during stance.

Otto Bock's information page:



3S80 Sports Prosthesis (Otto Bock)

3S80 Sports Prosthesis

The 3S80 Sports Knee forms part of Otto Bock's latest sports prosthesis, together with the 1E90 Sprinter Carbon Foot and 4R204 Sport Foot Adapter.

Otto Bock's information page:



C-Leg (Otto Bock)


Microprocessor controlled hydraulic knee. See our separate pages on the C-Leg:

Otto Bock's information page:


Genium (Otto Bock)


A microprocessor controlled knee.

Otto Bock's information page:


Mauch Knee

Mauch Knee

Hydraulic Knee with swing and stance phase control.

Ossur's information page:



NK-6 Hydraulic Knee (Nabtesco)

NK-6 Knee

A 6-bar hydraulic, polycentric knee.

Nabtesco's information brochure:



Polycentric Knees

Knees with a variable centre of rotation, more closely mimicking the movement of the human knee centre of rotation as it flexes / extends. Many models are available on the market, including 4, 6 or 7 bar linkage designs. Advantages include:

  • Centre of rotation moves behind the TKA line during stance, providing greater stability.
  • The centre of rotation remains behind the TKA line during the first few degrees of flexion, providing opportunity to bear weight on the toe in late stance, and a more natural transition to swing.
  • The knee folds flatter against the bottom of the stump in sitting, providing better cosmesis.
  • Shortening of the shank segment during swing, increasing toe clearance.

As well as pictured those below, the 3R-60 and NK6 knee are examples of polycentric knees. See Knee Disarticulation - A Whirlwind Tour for more detail on polycentric knees.

3R-46 Polycentric Knee 4-Bar Knee Swan Polycentric Knee Seattle Select Polycentric Knee Total Knee Junior Visco-Elastic 4-Bar


Power Knee (Ossur)

Power Knee

Ossur's information page:

The video below is from Beyond Tomorrow, demonstrating the Power Knee.


Rheo Knee (Ossur)

Rheo Knee

A microprocessor controlled knee which uses magnetic technology to control swing and stance phases. Capable of adapting to a user's pattern of walking over time.

Ossur's information page:

Rheo Knee Gait Training Videos, with Robert Gailey, Physiotherapist:


Total Knee (Ossur)

Total Knee

A polycentric knee design with geometric locking during stance phase for extra stability. Coming in several models: 1900, 2000, 2100, and Junior.

Ossur's information page: