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Orthopaedic, Trauma & Prosthetics
Wonderful 3F36B

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Wonderful Orthopaedic, Trauma & Prosthetics

Wonderful 3F36B

Product Code: OTAP-PLAC-3981

A locked through-knee joint in stainless steel, chosen for long service.

Budget for the years after purchase with a locking joint made only in stainless steel. The 3F36B serves limbs amputated through the knee, carries a 125 kg load weight, weighs 880 g and puts its running cost into lock checks, pivots and spares.

Sections

Prosthetic Feet & Knees

Categories

Orthopaedic, Trauma & Prosthetics

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Stainless steel and a lock define the brief for Wonderful's 3F36B, a locked four-axis prosthetic joint for knee disarticulation, the amputation that passes through the knee. Its Chinese name, 锁紧四连杆膝离断, reads as locking four-link knee disarticulation. The sheet gives a load weight of 125 kg, a mass of 880 g and one material, stainless steel. Knee flexion range is set out in the manufacturer's instructions for use. Nothing on the joint is electrical, and the sheet lists no second metal.

This is a joint bought to stay in service, so its price is only the opening entry in the account. Stainless steel resists rust in humid workshops and coastal towns, which matters to export programmes that cannot replace a corroded part quickly. The grade is named on the material certificate, and any stainless steel can still pit where salt sits in a crevice. Running costs come from elsewhere. The lock and the four pivots wear with every sit and stand, release parts need renewing, and reviews take bench time. If the top plate is laminated into the socket, as the photograph suggests, the joint also stays with that socket at a remake.

The photograph shows a tall, tapering dark plate with two small holes, rising from a flanged base. Beneath it, a pale block with two round holes sits between dark side links, and the lower body ends in a short ridged stub. Standard supply is the joint alone. Lock type, release method and any cord or lever are described in the instructions for use.

The manufacturer's drawing, shared by the enquiry team, carries the overall height, the plate outline and the size of the lower connection. It is available to buyers in more than 80 countries through Medigear.uk, and the enquiry team sets out stock and lead time.

The 3F36B belongs in through-knee limbs that a service expects to maintain for years. Its clinical job is narrow: hold the leg straight for standing and short walks, then free it for sitting. The buying case is about what that job costs to sustain.

Knee disarticulation is uncommon. A 2016 systematic review of 17 articles noted that it made up 1.7% of dysvascular lower-limb amputations in Scotland. The same review found favourable healing and better maintenance of independent living among knee disarticulation patients, while prosthetic walking rates were inconsistent, and it graded its recommendations at level C. Small numbers mean a service fits few of these joints, so each one must stay serviceable without a deep shelf of spares.

Stainless steel suits that long view where the air is damp or salty. Limb-fitting centres in tropical and coastal regions, charity workshops and export programmes often work a long way from a parts supplier, and a rust-resistant frame gives them one fewer reason to pull a limb from use. Salt still needs managing, because chlorides can pit stainless steel in crevices, and the grade appears on the material certificate.

Locked walking suits people who need security above speed: older through-knee amputees, those with weak hip muscles or poor balance, and new wearers in early gait training. For them, the whole-life plan covers scheduled lock checks, a stock of release parts and a decision on how the joint is recovered at each socket remake.

Typical settings are prosthetic workshops, rehabilitation centres and community limb clinics. NHS trusts in England order through the mandated prosthetics framework, and public buyers elsewhere follow their own documented routes. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

A frame that resists rust in damp air

Stainless steel protects itself with a chromium oxide film. In a humid workshop or a monsoon season, that keeps surface rust off the links and plate without paint or plating to chip.

Costs that can be scheduled

Lock checks, pivot inspection and release parts recur on a timetable the service sets from the manufacturer's interval. Planned work is cheaper to staff than a limb returned broken.

One metal, one mass, one stock line

The sheet lists stainless steel only and a single figure of 880 g. A store holding this code has no second version to mix up at reorder, and the build file needs one mass.

Suited to programmes far from a supplier

Export and charity services wait weeks for parts. A corrosion-resistant joint with a short, known list of wear items lets them order spares with the first batch and keep limbs in use.

Security for standing and short walks

With the lock engaged, the leg stays straight under load. That gives an unsteady through-knee wearer one thing fewer to manage on the way from bed to chair.

A clear 125 kg ceiling

The rating tells a service at once which wearers this stock can serve. It also sets the figure every other component in the limb has to meet for the system rating to hold.

Wear that can be seen

Links, pins and the pale centre block sit in the open in the photograph. If the supplied joint matches it, a technician can look for play, pitting and cracked parts without stripping the limb.

No electrical upkeep

There is no battery to charge and no electronics to keep dry. The maintenance budget is purely mechanical, and electrical safety testing does not enter it.

Locking four-link mechanism

Both the English and Chinese names describe four axes joined by links, with a lock that holds the joint in extension. The instructions for use set out how that lock engages.

Knee disarticulation format

This joint is named for amputation through the knee, where the femur stays whole and the residual limb is long. The format is defined on the sheet by name, and the drawing gives the geometry behind it.

Stainless steel throughout the listing

"SS" is the only material printed. The grade, and whether pins and screws share it, are named on the material certificate that the manufacturer issues.

880 g mass

The sheet gives one mass. Record 880 g in the limb's weight budget, because it sits at the far end of a long thigh and the wearer lifts it at every step.

125 kg load weight

Printed on the sheet as "Load Weight:125Kg". The ISO 10328 test report states the loading level that figure was reached at.

Knee flexion range per instructions

How far the joint bends when unlocked is given in the manufacturer's instructions for use. Seating plans for the wearer depend on it.

Tall tapering top plate

In the photograph a dark plate narrows to a rounded tip and carries two small holes. Its shape resembles a lamination plate for a through-knee socket, and the drawing gives its profile.

Flanged base under the plate

A wider dark flange sits where the plate meets the joint. Read its diameter and thickness from the drawing before shaping the distal end of the socket.

Pale centre block

A cream-coloured block with two round dark holes fills the middle of the frame in the image. The spare parts list names it and says whether it is a wear item.

Dark side links

Two dark links run down either side of the pale block. These, with their pins, are the moving parts that reviews should check for play.

Ridged lower stub

The body ends in a short cylinder that looks ridged or threaded in the photograph. The manufacturer's drawing identifies the connection and the part it mates with.

Lock release

Release method, cord or cable routing and any handle are described in the instructions for use. The quotation lists whichever of those parts are shipped.

Mechanical only

No motor, sensor or battery is involved. Care consists of cleaning, drying, inspection and part replacement as the manufacturer directs.

Manufacturer's quality claims

Wonderful's website describes an ISO 13485 quality system and CE certification. The declaration and certificate scope for this code come through the enquiry team.

Choose the 3F36B when a through-knee wearer needs a locked leg and the service intends to keep that limb running for years, especially in damp or salty air. It is a poor match for brisk walkers, for anyone over 125 kg and for wearers who cannot work the release. The decision turns on upkeep, so settle four points first: the knee flexion range, the steel grade, the service interval with its spare parts list, and whether the plate can be recovered when a socket is remade. Price the joint across its expected service, with those answers in hand.

Medigear.uk lists the 3F36B for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the ISO 10328 test report, instructions for use, drawing, material certificate and spare parts list before ordering.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

Four things make up most of the bill: review time, lock and pivot wear, release parts and the socket remakes that happen as a residual limb changes. None of them appears on a price list, so ask for the service interval, the spare parts list and the warranty terms with the quotation. A service that prices those across the years it expects to keep the limb in use sees the true cost per wearer.

Stainless steel forms a thin chromium oxide film that protects the metal beneath, which is why it holds up in damp air where plain steel would rust. Salt is the exception to watch. Chlorides from sea spray or sweat can break that film locally and cause pitting, most often in crevices around pins and screws. Follow the cleaning and drying steps in the manufacturer's instructions for use, and look at the pivots first at each review.

The sheet prints "SS" and nothing more, and grades differ in how they cope with salt. Grade 304 holds roughly 18% chromium and 8% nickel, while grade 316 adds 2–3% molybdenum for better resistance to chloride pitting. Trade guidance commonly reserves 316 for sites within about 5 km of the sea. The grade used in this joint is named on the manufacturer's material certificate, which the enquiry team shares.

The knee flexion range appears in the manufacturer's instructions for use, shared by the enquiry team. Establish that figure before the socket is cast, since it decides whether the wearer can sit in a low chair, a car seat or a wheelchair with the limb on. A through-knee limb is long, so the bend available at the joint matters to how the shin tucks under a seat.

The instructions for use describe the lock type, how it engages and how the wearer frees it. No cord, lever or button can be picked out in the photograph, so the release parts and their route along the socket should be read from the manufacturer's drawing. Check the method against the wearer's grip strength and reach before the joint is ordered.

On any locking four-link joint the wear points are the lock faces, the pivot pins and their bushings, any extension stop and the release cord or cable. The manufacturer's spare parts list gives the part numbers and says which items can be changed in the workshop and which need the joint returned. Programmes far from a supplier usually order release parts and pivot hardware with the first batch.

The photograph shows a tall plate of the kind normally laminated into a through-knee socket. A joint fixed that way stays in the old socket until a technician cuts it free, so the instructions for use should say whether the plate may be laminated a second time. New amputees often need a fresh socket within the first year or two as the limb changes shape. Cost the remake policy at the outset.

It covers this joint only. A finished limb is rated at the figure of its lowest-rated part, and many structural adapters, tubes and feet carry ceilings of their own. The 125 kg figure is printed without an ISO 10328 loading level, so ask for the test report, which the manufacturer issues and the enquiry team shares. Body weight plus anything the wearer habitually carries has to sit inside the final system rating.

Wearers who walk briskly, change pace or cover long distances will find a locked leg tiring, because a straight limb clears the ground only by hitching the hip or swinging outward. People above the 125 kg ceiling, and anyone unable to work the release, need another specification. At 880 g it also adds mass at the end of a long residual limb, so weak hip muscles deserve an honest assessment first.

Published findings point both ways. A 2022 inpatient study followed 815 people with transfemoral amputation or knee disarticulation through 32,213 patient-days and logged 68 falls. Once other factors were adjusted, locked knees showed no significant difference in fall rate, and certain medicines predicted falls more strongly. A smaller 2002 study reported that 11 of 14 older vascular amputees preferred walking locked. Neither study tested this joint.

The 3F36B is typically Class I under UK MDR 2002, or higher depending on use, as stated on the manufacturer's declaration of conformity, which the enquiry team shares. A limb assembled around it for one named person counts as a custom-made device, and the manufacturer duties for that limb rest with the workshop that built it. Structural testing for lower-limb prostheses follows ISO 10328.

NHS England has mandated the NHS Supply Chain framework for Prosthetic Components and Associated Products, which runs from 24 November 2025 to 23 November 2027 as a single Artificial Limbs lot. NHS procurement routes in England go through that framework, and equivalent public procurement elsewhere asks for a documented supply route of its own.