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OP4 Knee

OP4 Knee


The OP4 Knee is a pneumatic, monocentric knee joint with brake function. Due to the finely adjustable brake, the joint can be adapted to the individual’s safety requirements.

Benefits of OP4 Knee

  • Braking behavior can be adjusted to suit the user
  • Individually adjustable swing phase for a harmonious gait
  • Highly acute flexion angle for more freedom of movement
  • Kneecap provides additional protection for both the knee and clothing

Impact Levels

Impact LevelExample


Daily activities involving average walking with the ability to vary speed or walking pattern.

Example: Going to the shops, confident outdoor walking.


L5822 L5845 L5850

Note: Responsibility for accurate coding lies solely with the provider treating the patient. Össur assumes no responsibility or liability for the provider’s coding decisions. Össur’s coding suggestions rest on its best judgment and are subject to revision based on additional information or changes in the alpha-numeric system.

OP4 Knee Specifications

OP4 Knee™ Product Information
Warranty Information
Amputation Level:


Knee Disarticulation

Impact Level: Moderate
Maximum Patient Weight: 100kg (220lbs)
Weight Of Knee: 680g (1.50lbs)
Knee Flexion: 145°