Price on request
FreeWalk (170K1)
Stance-control orthoses. Slim mechanical stance-control KAFO that locks the knee in stance and frees it for swing.
Ottobock
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Ottobock · Stance-control orthoses · OR-002
Ottobock E-MAG Active 17B203 stance-control orthotic knee joint
The Ottobock E-MAG Active 17B203 stance-control knee joint is an electronically controlled component for a leg orthosis. A sensor measures the position of the leg during walking and an electromagnetic lock holds the knee for stance, then releases it for swing. Its PreLock function secures the joint before the leg is fully straight. One charge covers up to 5,000 steps, about 8 km, and the maximum body weight is 220 lb (100 kg).
- Lock
- Electromagnetic
- Sensor
- Leg position sensor
- Function
- PreLock
- Steps per charge
- Up to 5,000 (about 8 km)
Ottobock E-MAG Active (17B203) key features
- Electromagnetic lock controlled by a leg position sensor
- Locks for stance, releases for swing
- PreLock secures the knee before full extension
- Up to 5,000 steps, about 8 km, per charge
- Maximum body weight 220 lb (100 kg)
- Left and right versions; 5 or 7.5 degree flexion angle
Who the Ottobock E-MAG Active (17B203) suits
E-MAG Active suits people with leg paralysis or weak or absent knee extensors who cannot hold the knee stable unaided. The maker says it can be used even without ankle function. An orthotist builds it into a custom orthosis, so selection is made with a clinician.
This kind of device is prescribed and fitted by a clinician. An enquiry starts that conversation. It is not a purchase.
Figures for comparing
- Max user weight
- 100 kg (220 lb)
The same units on every product, converted from the specifications below. Where a source gives two limits, the lower one is shown.
Ottobock E-MAG Active (17B203) specifications
| Product type | Electronic stance-control orthotic knee joint |
|---|---|
| Lock | Electromagnetic |
| Sensor | Leg position sensor |
| Function | PreLock |
| Steps per charge | Up to 5,000 (about 8 km) |
| Max body weight | 220 lb (100 kg) |
| Flexion angle options | 5 deg (standard), 7.5 deg |
| Sides | Left, right |
| Article number | 17B203 |
| Maker country | Germany |
| Price | Quoted on request |
| Brand | Ottobock |
| Category | Stance-control and microprocessor orthoses, Stance-control orthoses |
| Catalog ID | OR-002 |
Compared with the source page on 5 October 2026. Details can change, so we confirm them in your quote. Open the source page.
Ottobock E-MAG Active (17B203): common questions
How long does the E-MAG Active battery last?
Up to 5,000 steps per charge, which Ottobock equates to about 8 km. That is usually enough for a day, with recharging overnight.
What is the weight limit for E-MAG Active?
The maximum body weight is 220 lb, or 100 kg.
Do I need ankle movement to use E-MAG Active?
No. Ottobock states that users with no ankle function can use this joint.
How to get a quote for the Ottobock E-MAG Active (17B203)
Add it to your enquiry list
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You receive availability, a price and delivery options by email, and decide after that.
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