Mechanical polycentric Rs 220,000 to 400,000
Our socket, a mechanical four-bar knee and a SACH or dynamic foot. Stable and simple.
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- Test socket
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Four-bar knee
Polycentric knee joint, stable underfoot and easy to swing
A polycentric knee turns on four linked bars instead of one hinge, so its pivot point moves as it bends. It feels very stable when you stand on it and shortens slightly as it swings, so the toe clears the ground. It suits many first legs, longer stumps and through-knee amputations.
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Reviewed by Ummad Shafique Mughal, Consultant Orthotist and Prosthetist. Updated October 2026.
In short
What is a polycentric knee?
The short answer
A polycentric knee has four bars joined at four pivots. As it bends, the point it rotates around moves, which gives two useful effects. When you stand on it straight, the knee is hard to buckle, so it feels safe. When it bends during the swing, the lower leg tucks back and the leg gets slightly shorter, so the toe does not catch. Polycentric knees come in simple mechanical versions and versions with pneumatic or hydraulic swing control, such as the Össur Total Knee and the Ottobock 3R60.
A complete above knee leg with a polycentric knee costs about Rs 220,000 to 900,000.
Is it right for you?
Who a polycentric knee suits
Usually a good fit if
- First above knee legs, where stability builds confidence
- Longer thigh stumps and through-knee amputations
- Older users with fair balance who want more than a locking knee
- Users who catch their toe with a single-axis knee
We may advise waiting, or something else, if
- Very fast walkers who need full speed adaptation; a hydraulic knee may suit better
- Users who need a knee that cannot bend at all while walking; a locking knee is safer
- Very short thigh stumps with little control
Versions
Mechanical, pneumatic and hydraulic polycentric knees
All share the four-bar design. What controls the swing is what changes.
| Version | Swing control | Typical user | Indicative price of the leg |
|---|---|---|---|
| Mechanical | Spring and friction | First legs, home and community walking | Rs 220,000 to 400,000 |
| Pneumatic | Air cylinder | Moderate walkers | Rs 350,000 to 650,000 |
| Hydraulic | Oil cylinder | Active walkers and through-knee users | Rs 500,000 to 900,000 |
Cost in 2026
What a leg with a polycentric knee costs
Leg with polycentric knee
Rs 220,000 to 900,000local to imported build
Pneumatic or hydraulic Rs 350,000 to 900,000
Swing control that adapts better to your pace, with an imported dynamic foot.
- Assessment
- Test socket
- Training
For through-knee legs Leg from Rs 170,000
Compact four-bar knees made to sit close under a full-length thigh bone.
- Assessment
- Test socket
- Training
Indicative ranges. A firm figure comes in writing after the free assessment and does not change without your agreement. Full cost guide.
Your visits
Four visits for most legs with a polycentric knee
Assessment
Stump length, balance and goals.
Casting
A socket shaped to give you good control of the knee.
Test socket
We check stability as you stand and step.
Fitting and training
The knee is aligned for stability, then walking practice begins.
Coming from out of town? Tell us your dates and we will plan the visits close together.
How four bars make a knee stable
A single-axis knee bends around one hinge, so whether it buckles depends on where your weight falls in front of or behind that hinge. A polycentric knee works around an imaginary point created by its four bars, and when the knee is straight that point sits high and behind, where your weight naturally keeps the knee locked. You can feel this the first time you stand on one: it simply feels solid.
Toe clearance and tripping
As a polycentric knee bends during the swing, the lower leg tucks back and the whole leg becomes a little shorter. The toe clears the ground more easily, which matters on broken pavements, raised door thresholds and the edges of carpets. Fewer catches mean fewer stumbles.
Why through-knee users choose them
After a knee disarticulation, the full-length thigh bone leaves little room under the socket. Compact four-bar knees fold the lower leg back under the knee when you sit, keeping the knees much closer to level than an ordinary knee would.
Daily life with a polycentric knee
The knee folds neatly when you sit on a chair, a car seat or a rickshaw bench. For floor sitting and namaz, many users take the leg off or use a chair for sajda. The pivots need occasional checks for wear; a new click or a loose feel is a reason to come in.
Travelling to us?
Coming to us for a polycentric knee from another city or country
Tell us your city or country and your travel dates when you call. We plan the visits as close together as the stump allows, so most patients can finish the casting, test socket and fitting in one stay, whether they come from Quetta or fly in from Dubai, with a shorter trip later for adjustments if needed.
Questions
Questions about the polycentric knee joint
What is the difference between a polycentric and a single-axis knee?
A single-axis knee bends around one hinge, like a door. A polycentric knee bends around a moving point created by four linked bars, which makes it more stable when standing and shorter when swinging.
Is a polycentric knee good for elderly users?
Often, yes, for those with fair balance. It is more forgiving than a single-axis knee. For users with poor balance, a locking knee is safer at first.
How much does a leg with a polycentric knee cost?
About Rs 220,000 to 400,000 with a mechanical polycentric knee, and up to about Rs 900,000 with pneumatic or hydraulic swing control.
Can a polycentric knee be used after a through-knee amputation?
Yes, and it is usually the best choice, because compact four-bar knees sit close under the full-length thigh bone and keep the knees nearly level when sitting.
Related
Pages people read next
Above Knee Artificial Leg
Replaces the knee too. The knee joint you choose shapes how you walk.
Read moreKnee Disarticulation Prosthesis
For amputation through the knee: an end-bearing stump and a compact knee.
Read moreHydraulic Knee Joint
Smooth, speed-adapting knees for daily outdoor walking.
Read moreLocking Knee Joint
Knees that stay straight until you unlock them to sit. Safest for first legs.
Read moreWe import and fit parts from Ottobock, Össur, Blatchford, Proteor, Fillauer and other makers to order, and we are independent of all of them. Brands we fit.
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