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+ 1. Do you offer a warranty on the All-Terrain Knee?

Yes, we offer a 2-year warranty, including for waterproofing.

+ 2. Can I trial an All-Terrain Knee unit?

Yes! LegWorks offers a risk-free 60-day trial on all purchases.

+ 3. How can I buy the knee? Can I order through a distributor?

Order the knee directly from LegWorks using credit card or accounts invoicing. Call (844) 868-0880 to order via phone or order on our website.

LegWorks does not currently sell through a distributor in the U.S, but does sell through distributors internationally.

+ 4. What L Codes can get reimbursed for the All-Terrain Knee?

Our suggested L Codes are L5611 (Addition to lower extremity, endoskeletal system, above knee-knee disarticulation, 4 bar linkage, with friction swing phase control), L5850 (Addition, endoskeletal system, above knee or hip disarticulation, knee extension assist), and L5925 (Addition, endoskeletal system, above knee, knee disarticulation or hip disarticulation, manual lock). These L Codes have been successfully reimbursed by Medicare and private insurers.

We also suggest L5845 (Addition, endoskeletal knee-shin system, stance flexion feature, adjustable) for the All-Terrain Knee with Stance Flexion.

+ 5. Is the All-Terrain Knee good for low-mobility patients?

The All-Terrain Knee is great for low-mobility patients and can be an integral part of the rehabilitation process. It has a simple and robust manual lock for K1 level mobility patients. The AutoLock mechanism then provides a safe and energy efficient knee for K2 level mobility patients and beyond, allowing for a smooth progression in mobility. The innovative VCC allows for K2 level patients to begin walking at multiple speeds by allowing variable cadence which can help patients progress to the K3 mobility level.

+ 6. Is it good for high-mobility patients?

The All-Terrain Knee is a great option for high-mobility patients who are seeking a secondary/recreational knee joint for water-based activities (e.g. going to the beach). The manual locking feature is helpful when in the water.

The All-Terrain Knee is also great for patients that don’t have insurance, or those who are too harsh on their current hydraulic, or microprocessor knees.

+ 7. Does the All-Terrain Knee have a hydraulic or pneumatic?

No, the All-Terrain Knee is purely mechanical, and does not have any hydraulics. The All-Terrain Knee does have a novel swing phase controller, the VCC, Variable Cadence Controller, which allows for variable cadence.

+ 8. How does this compare to the Total Knee 1900 or other polycentric knees?

Unlike polycentric knees with geometric locks that require weight-bearing to engage, the All-Terrain Knee has a positive locking mechanism that locks upon extension. This is beneficial as the All-Terrain Knee will support the amputee’s weight no matter the ground reaction forces occurring at heel strike.

The knee is then unlocked at toe-off by loading the toe and flexing the hip, as occurs in the natural gait pattern, making the All-Terrain Knee much more stable than polycentric knees. Clinical testing with children against a leading polycentric knee joint reduced reported falls from once per day to once per month.

Source: Andrysek J et al. Design and quantitative evaluation of a stance-phase controlled prosthetic knee joint for children. IEEE Trans Neural Syst Rehabil Eng, 13:4,437-43. 2005.)

+ 9. How does the All-Terrain Knee unlock?

The AutoLock locks automatically upon full extension. The All-Terrain Knee needs to be assembled to a complete prosthesis to unlock.

The All-Terrain Knee is unlocked by firmly loading the toe and then flexing the hip while keeping the toe load constant. This can be difficult to do by hand, but occurs in the natural gait pattern.

The All-Terrain Knee can also be unlocked when attached to the socket by pushing firmly on the cover of the knee, and flexing the knee.

+ 10. Is this knee really waterproof, or is it just water resistant?

The All-Terrain Knee is really waterproof in fresh water!

+ 11. What is the weight of the All-Terrain Knee? Why is the knee heavier than most other mechanical knees?

The All-Terrain Knee weight is 1,025 g (including male pyramid).

The All-Terrain Knee is heavier than most mechanical knees, but also provides a higher level of function. Clinical trials comparing the All-Terrain Knee against a friction braking knee less than half its weight showed 40% energy efficiency savings when using the AT-Knee. Patients typically say the knee feels light when walking.

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