Suitable for submersion (up to 1 metre)
Activity Level 2

AvalonK2 is a hydraulic ankle that has been designed specifically for the complex needs of limited community ambulators. Through a combination of award-winning hydraulic ankle technology and a unique optimized keel, Blatchford has created a prosthesis that works with the user to enhance confidence, independence and safety.

Enhancing walking confidence by hydraulically adjusting to inclines and self-aligning to secure the knee joint, AvalonK2 encourages good posture and joint position. This improves stability, helping to prevent falls and increases balanced limb loading to provide the best performance for limited community ambulators.

Download our White Paper: A Study of AvalonK2


  • Hydraulic ankle technology designed to replicate natural motion
  • Optimized keel shape enhances walking stability
  • Plantarflexion compliance when descending slopes
  • Increased range of motion to enable greater sit-stand transfer safety
  • Increased shock absorption, reduction in interface pressures
  • Remains dorsiflexed for increased toe clearance in swing phase
  • Waterproof
  • Sandal toe footshell

Foot shell and glide sock included.

Learn about Hydraulic Ankle Technology

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AvalonK2 Unique Design

The main driving force behind advancing lower limb prosthetic technology in the 21st century is biomimetic design; reproducing the biomechanical performance of natural limbs. Inherent in this is recognizing that different demographics of the amputee population have different biomechanical requirements, and that the engineering principles behind different devices must accommodate for this. With over 128 years of innovation and expertise in lower limb prosthetic technology our award-winning prosthetic products are designed with the patient in mind.


Hydraulic Ankle Technology

Hydraulic ankles help align the body interface with the ground interface, allowing for more natural movement and posture. By continuously adjusting to absorb energy, our hydraulic ankles allow for an efficient roll-over, remaining in a dorsiflexed position, increasing clearance to help reduce the risk of falls. This technology has been proven to provide a number of benefits to limited community ambulators optimizing posture and comfort.

AvalonK2 Range of MotionRange of Motion

An important design consideration of AvalonK2 was to enable the user to stand from a seated position in a safe and comfortable way. In addition to the keel and shape, the 6° of dorsiflexion allows the base of support to be moved closer to the body’s centre-of mass making it easier to sit-stand.

Purpose Designed Keel

Limited community ambulators tend to walk more slowly, with a shorter step and stride length. Providing a foot keel that is designed to accommodate natural changes in gait can provide a smoother rollover for such users. The optimized keel shape of AvalonK2 considers such requirements and encourages a consistent, stable, and comfortable rollover so the user can walk more easily and move around confidently

The Benefits of AvalonK2

Clinical Evidence

Download the AvalonK2 Whitepaper

White Paper: A Study of AvalonK2

To take a more in-depth look into AvalonK2, discover our White Paper ‘A Study of AvalonK2’ where the biomechanics of the limited community ambulators gait are considered along with the latest clinical evidence for biomimetic hydraulic technology. Then uncover how the biomechanical performance of AvalonK2 can improve mobility and independence.

Download PDF

Technical Data

Max. User Weight


Size Range


Build Height


Heel height



Max. User Weight/Activity Level: 150kg (330 lb)
Activity Level: 2
Size Range: 22-30cm
Component Weight: 520g (1 lb 2 oz)
Build Height: 115mm (4¹⁷/₃₂”)
Heel Height: 10mm
Range of Ankle Motion: 6° plantar to 6° dorsiflexion

†Component weight shown is for a size 26cm without foot shell.

Suitable for submersion


AV 25 L
  Size Side


For dark tone add suffix D.
Foot example: AvalonK2 size 25 left.

Patent reg: US8574312, US8740991. EU/RoW: 5336386

An annual visual inspection is recommended. Check for visual defects that may affect proper function. Maintenance must be carried out by competent personnel.

Blatchford trademarks.

Last updated: 7th November 2018

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