Suitable for outdoor use
Activity Level (2) 3 (4)

Orion3 is a microprocessor knee suitable for K2 to K4 walkers who would benefit from stability on different terrains, slopes and steps and for those wishing to walk naturally and efficiently at either single or varying speeds.

The safety and stability of Orion3 encourages users to evenly distribute their weight, offloading their sound side and lower back to reduce aches and pains commonly reported by amputees.

Key Features

  • Situational Awareness – an Inertial Measurement Unit senses movement and speed to respond accordingly, in real time
  • Enhanced Stability Performance – 5 levels of stance resistance optimises safety at all times

– Controlled Stance Support
– Standing Support
– Dynamic Slope and Stair Descent
– Stumble Recovery
– Supported Sitting

  • Natural Efficient Motion – MPC pneumatics ensure energy efficient and smooth swing at multiple speeds

– Optimal Stance Release
– Adaptive Speed Control
– Terminal Swing Damping

  • Cycling Mode and Fixed Angle Flexion Lock Mode
  • Knee Flexion to 130°
  • Intuitive Programming Software via PC or App
  • New! Magnetic Charger 
  • Lithium Ion batteries with up to 3 days life, dependent on usage
  • Battery Life Indicator and Low Power Mode

Enhanced Stability Performance

Enhanced Stability Performance (ESP) increases the user’s confidence and independence, reducing the risk of stumbles or falls and ensuring more balanced limb loading for greater long term health and protection.

ESP adapts hydraulic resistance in real time, providing optimal stance support whether walking in a crowded environment, on uneven terrain, slopes, steps and now also when standing. With situational awareness, Orion3 continuously monitors the user’s activity and responds accordingly for greater safety.

Orion3 Controlled Stance Support

Controlled Stance Support

Supportive resistance throughout stance phase provides optimal stability for walking with greater safety and less effort on all-terrain.

Orion3 Standing Support

Standing Support

Maximum resistance stabilises knee, on both flat and slopes, encouraging better posture and balanced loading to relieve pressure on sound limb and lower back.

Orion3 Stumble Recovery

Stumble Recovery

Stance resistance engages during swing phase extension to ensure knee stability should the user stumble.

Orion3 Stair Descent

Dynamic Slope & Stair Descent

Knee resistance progressively increases with immediate support on the first step and increasing support with further knee flexion for enhanced control and safety when descending stairs or slopes.

Orion3 Supported Sitting

Supported Sitting

Progressive hydraulic resistance ensures greater support and control to sit down with safety and confidence and more balanced loading across both limbs.

Natural Efficient Motion

Knee flexion during swing phase varies according to walking speed. With microprocessor pneumatic swing control, Orion3 controls heel rise across a range of walking speeds for a more natural swing. The pneumatic spring also makes it easier to initiate swing, saving energy with every step and ensuring more natural knee flexion at lower speeds.

*Studies have shown the reduced physiological cost of walking, with reduction in energy expenditure by up to 20% – please refer to our clinical compendium for further details.

Real Life Stories

Chris & Denise’s Story

Becky’s Story


Smart Programming App

DownloadAppStoreDownloadGooglePlayProgramming Orion3 just got faster and simpler with the new Orion3 Programming App for clinicians available on iOS. With its simple to follow automated smart programming, you can complete limb set up with fewer steps whilst still having access to more advanced fine tuning if required. 

This app is for clinicians who have completed a Blatchford approved training course and requires an authorisation code:

  1. Download the app from the App Store, search for “Orion3”.
    If using an iPad please choose “iPhone Only” when searching.
  2. On first use, send the 8 digit “Authorisation Request Code” to your Blatchford representative.
  3. Enter the 12 digit code provided by your Blatchford representative into the app.
  4. Start programming Orion3!

For support questions please contact Blatchford Technical Support at technical.support@blatchford.co.uk

* Compatible with all models of iPad, iPhone and iPod Touch running iOS v9 or later.

UK NHS MPK Funding

The NHS England Clinical Commissioning Policy for microprocessor controlled knees means that MPK’s can now be prescribed to patients at specialist rehabilitation centres giving Prosthetists the opportunity to prescribe amputees with the best solutions the market has to offer.

MPK Guide for Users

Orion3 Clinical Evidence Reference

Improvements in Clinical Outcomes using microprocessor-controlled prosthetic knees

  • Significantly reduced number of falls1,2
  • Reduced centre-of-pressure fluctuations by 9-11% with standing support active when standing on sloped ground3
  • Less cognitive demand during walking, leading to reduced postural sway4
  • Increased walking speed5
  • Easier to walk at different speeds6
  • Higher scores in mobility-related patient-reported outcome measures7
  • More natural gait6,8
  • Easier to walk on slopes6
  • Reduced energy expenditure compared to mechanical knees9-13
  • Equivalent energy expenditure to other MPKs14
  • Reduced self-perceived effort6,8
  • Energy expenditure closer to that of able-bodied control subjects15
  • Able to walk further before becoming tired6
  • Better step length symmetry5
  • Reduced loading asymmetry with standing support active when standing on sloped ground3
  • Reduced fear of falling1
  • Reduced limitations due to an emotional problem8
  • Preference over other prosthetic knees1,14
  • Reductions in direct and indirect healthcare costs when using an MPK16


1. Kaufman KR, Bernhardt KA, Symms K. Functional assessment and satisfaction of transfemoral amputees with low mobility (FASTK2): A clinical trial of microprocessor-controlled vs. non-microprocessor-controlled knees. Clin Biomech 2018; 58: 116–122.
2. Campbell JH, Stevens PM, Wurdeman SR. OASIS 1: Retrospective analysis of four different microprocessor knee types. Journal of Rehabilitation and Assistive Technologies Engineering. 2020;7:2055668320968476.
3. McGrath M, Laszczak P, Zahedi S, et al. Microprocessor knees with ‘standing support’ and articulating, hydraulic ankles improve balance control and inter-limb loading during quiet standing. J Rehabil Assist Technol Eng 2018; 5: 2055668318795396.
4. Heller BW, Datta D, Howitt J. A pilot study comparing the cognitive demand of walking for transfemoral amputees using the Intelligent Prosthesis with that using conventionally damped knees. Clin Rehabil 2000; 14: 518–522.
5. Chin T, Maeda Y, Sawamura S, et al. Successful prosthetic fitting of elderly trans-femoral amputees with Intelligent Prosthesis (IP): a clinical pilot study. Prosthet Orthot Int 2007; 31: 271–276.
6. Datta D, Howitt J. Conventional versus microchip controlled pneumatic swing phase control for trans-femoral amputees: user’s verdict. Prosthet Orthot Int 1998; 22: 129–135.
7. Wurdeman SR, Stevens PM, Campbell JH. Mobility analysis of amputees (MAAT 3): Matching individuals based on comorbid health reveals improved function for above-knee prosthesis users with microprocessor knee technology. Assist Technol 2018; 1–7.
8. Saglam Y, Gulenc B, Birisik F, et al. The quality of life analysis of knee prosthesis with complete microprocessor control in trans-femoral amputees. Acta Orthop Traumatol Turc 2017; 51: 466e469.
9. Chin T, Sawamura S, Shiba R, et al. Energy expenditure during walking in amputees after disarticulation of the hip: a microprocessor-controlled swing-phase control knee versus a mechanical-controlled stance-phase control knee. J Bone Joint Surg Br 2005; 87: 117–119.
10. Datta D, Heller B, Howitt J. A comparative evaluation of oxygen consumption and gait pattern in amputees using Intelligent Prostheses and conventionally damped knee swing-phase control. Clin Rehabil 2005; 19: 398–403.
11. Buckley JG, Spence WD, Solomonidis SE. Energy cost of walking: comparison of “intelligent prosthesis” with conventional mechanism. Arch Phys Med Rehabil 1997; 78: 330–333.
12. Taylor MB, Clark E, Offord EA, et al. A comparison of energy expenditure by a high level trans-femoral amputee using the Intelligent Prosthesis and conventionally damped prosthetic limbs. Prosthet Orthot Int 1996; 20: 116–121.
13. Kirker S, Keymer S, Talbot J, et al. An assessment of the intelligent knee prosthesis. Clin Rehabil 1996; 10: 267–273.
14. Chin T, Machida K, Sawamura S, et al. Comparison of different microprocessor controlled knee joints on the energy consumption during walking in trans-femoral amputees: intelligent knee prosthesis (IP) versus C-leg. Prosthet Orthot Int 2006; 30: 73–80.
15. Chin T, Sawamura S, Shiba R, et al. Effect of an Intelligent Prosthesis (IP) on the walking ability of young transfemoral amputees: comparison of IP users with able-bodied people. Am J Phys Med Rehabil 2003; 82: 447–451.
16. Chen C, Hanson M, Chaturvedi R, et al. Economic benefits of microprocessor controlled prosthetic knees: a modeling study. J Neuroengineering Rehabil 2018; 15: 62.

See all the Clinical Evidence for every Blatchford product in our Clinical Evidence Finder Tool.

Orion3 Technical Data

Max. User Weight:


Activity Level:

2 3 4*

Component Weight:


Build Height:


Control Unit:

MPK Hydraulic/Pneumatic

*Dependent on local reimbursement guidelines/maximum user weight 100kg


Battery Charger Kit 239093
Clinician’s Manual 938374
Programming Tablet 019179
Charger Extension Cable 239098
Cosmetic Cover 561101BLACK

Proximal Attachments (ordered separately)

Rotating Pyramid with Shift 239017
Non-rotating Pyramid with Shift 239089
Rotating Female Pyramid with Shift 189128
M36 Threaded Adapter 239092

Socket Adapters 




Part Number: ORION3