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ATK HydraPro
ATK HydraPro
ATK HydraPro
ATK HydraPro
ATK HydraPro
ATK HydraPro
ATK HydraPro
ATK HydraPro

ATK HydraPro

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The ATK HydraPro is a waterproof and highly functional 4-bar prosthetic knee joint, designed to meet the physical demands of active amputees. LegWorks’ patented Autolock Technology stance phase controller instills confidence on all terrains, while the Hydraulic Variable Cadence Controller (patent pending) allows for multiple walking speeds. An ideal knee for K3-K4 users who desire a water leg, the ATK HydraPro includes a simple twist-knob manual lock that allows for absolute stability in or around the water.

Ships with the blue cover installed. Box includes an alternate black cover (shown here on the stance flexion model).

Weight Rating: 330 lb (150kg)

Warranty: 24-Month manufacturer's warranty

Reimbursement: L5814, L5845 (stance flexion only), L5850, L5925

Note: L-Codes suggested by LegWorks are for reference only, and are subject to change. The responsibility and liability for coding lie with the provider.


ATK HydraPro Marketing Flyer
ATK HydraPro Instructions for Use
ATK HydraPro Quick Reference Card
ATK HydraPro User Guide

Product Features

  • Waterproof and corrosion resistant. Submersible in fresh or salt water.
  • Superior stability to traditional polycentric designs via the patented AutoLock Technology.
  • Hydraulic Variable Cadence Controller (patent pending)
  • Simple twist-knob manual lock.
  • Durably designed with a weight rating of 330 lb (150kg).

Potential Users

  • Active amputees seeking a hydraulic, waterproof primary prosthesis that is low-maintenance.
  • Amputees seeking a secondary prosthesis with a hydraulic waterproof knee (e.g. shower/pool/beach leg).
  • Amputees that desire a highly stable hydraulic knee.

Product Specifications

Mobility Level K3-K4
Amputation Level Transfemoral, Knee Disarticulation (Non-Stance Flexion Only)
Knee Flexion Angle 150°
HYD-PA-02 Device Height & Weight 7 516 in (186mm)
2.32 lb (1,052g)
HYD-SF-02 Device Height & Weight 7 1516 in (201mm)
2.74 lb (1,242g)

Selecting the Right Knee

In order to provide an optimal experience for every user, LegWorks offers three different models of knee, each available with or without stance flexion. View the comparison chart below to determine which model is right for your patient.
Product Feature All-Terrain Knee All-Terrain Knee Premium ATK HydraPro
Variable Cadence Controller Non Fluid-based Non Fluid-based Hydraulic Damping
Submersible Freshwater Only Freshwater & Saltwater Freshwater & Saltwater
Weight Limit 275 lb (125kg) 330 lb (150kg) 330 lb (150kg)
Indicated Model: Long Residuum Without Stance Flexion Without Stance Flexion Without Stance Flexion
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