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Wonderful Orthopaedic, Trauma & Prosthetics

Wonderful 7E4

Product Code: OTAP-PLAC-4170

A hip joint with a built-in assist that helps bring the leg through.

Help the prosthetic thigh return forward on every step with an extension assist built into the hip joint itself. The 7E4 is a single axis stainless steel joint of 870 g, and its 100 kg load weight becomes the ceiling for the whole limb.

Sections

Prosthetic Feet & Knees

Categories

Orthopaedic, Trauma & Prosthetics

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

An extension assist is built into Wonderful's 7E4, a single axis prosthetic hip joint for hip disarticulation and hemipelvectomy limbs. The sheet gives four facts: stainless steel as the material, a weight of 870 g, a load weight of 100 kg and the name itself, which describes one pivot plus the assist. The flexion range of the hip, and any stop or lock, are set out in the manufacturer's drawing and instructions for use, which the enquiry team shares.

The assist matters most to how walking feels. A person who has lost the whole leg at the hip has no muscle acting across the prosthetic hip, so the thigh section has to be thrown forward by pelvic movement alone. An elastic element that returns it forward and down is designed to add momentum to that swing. Wearers may find the gait more fluent and the day less tiring as a result, although no published study of this joint shows it. The same recoil acts as the wearer sits, so the prosthetist sets it to keep lowering into a chair controlled.

The photograph shows a dark joint body with a long, thin plate angled up and back from it, which would sit against the front of the pelvic socket. Below, a copper-coloured tube runs downward from a tapered section, and a diagonal rod of the same colour links the front of the joint body to a collar on the tube, forming a triangle. That rod appears to carry the assist, and the instructions for use identify each part.

The 7E4's build height, plate dimensions and connections are drawn on the manufacturer's dimension sheet. It is available to buyers in more than 80 countries through Medigear.uk, and the enquiry team sets out stock and lead time.

Hip disarticulation and hemipelvectomy are uncommon levels. United States data for 1988 to 1996, cited by Schindler and colleagues in Archives of Orthopaedic and Trauma Surgery (2023), put hip disarticulation at 0.4% of lower-limb amputations and pelvic-level amputation at 0.1%. In their own series of 15 patients the causes were infection in seven, tumour in six, trauma in one and ischaemia in one.

Walking with a limb at this level asks a great deal. A 2015 Mayo Clinic review of 43 candidates in the American Journal of Physical Medicine & Rehabilitation found 43% used a prosthesis successfully, wearing it for an average of 5.8 hours a day. Chin and colleagues measured seven older hip disarticulation users walking at 30.5 m/min with an oxygen cost of 0.639 ml/kg/m. Those figures describe the amputation level, not this joint.

Patient experience is where the 7E4 makes its case. Its elastic assist is designed to give the swing a start, which some wearers may feel as a smoother rhythm and a little less effort by evening. The evidence for assists is thin and mixed: a 1984 Ottawa report found spring and cylinder extension assists did not win over its patients, and insecurity remained. A trial walk and a sitting test before final lamination show whether this wearer welcomes the return.

Typical settings are limb-fitting centres, sarcoma and orthopaedic oncology rehabilitation, major trauma follow-up and private prosthetic clinics that build pelvic sockets. NHS trusts in England buy through the mandated prosthetics framework, and public purchasers elsewhere apply their own tender rules. The conformity documentation those procurement routes require is issued by the manufacturer and shared by the enquiry team.

A swing that starts with help

The thigh section is returned forward and down by stored elastic energy. For a wearer with no hip muscles acting on the limb, that is one less movement to generate from the pelvis alone.

A gait that can feel more even

When the swing begins more readily, step timing can settle into a steadier rhythm. Fluency is something the wearer and prosthetist judge together at review.

Effort tracked honestly across the day

The case for the 7E4 on effort rests on the wearer's own report. A simple tiredness log on fitting day and at follow-up shows whether the assist earns its place.

Recoil tuned for sitting as well as walking

The same element acts when the wearer lowers into a chair. Setting it with a sitting test means the help in walking does not become a push in the wrong moment.

One pivot, easy to understand

A single axis gives the wearer one predictable arc to learn. Fewer moving parts also keep the inspection points short for the clinic.

Stainless steel construction

Stainless steel resists corrosion from sweat and washing. Grade and the parts it forms are listed on the material certificate.

A trial before the definitive socket

A check socket lets the wearer walk and sit with the assist before the pelvic socket is laminated. Their verdict on the return can then shape the final build.

A clear weight ceiling

At 100 kg, the joint's rating is easy to check against body weight and carried loads. The prescription can then be planned around one known limit.

Single axis hip

The name describes one pivot. Where it sits on the joint body and how it relates to the socket's centre of rotation are shown on the drawing.

Built-in extension assist

The assist is part of the joint's name and of its function. Its return force, adjustment range and replacement interval are set out in the instructions for use.

Elastic return forward and down

Energy taken up as the hip moves is released to bring the thigh section forward and down. That return is the source of the momentum the design aims for.

Adjustable recoil

How much return the wearer gets is a fitting decision. The instructions describe the adjustment and the checks that keep sitting controlled.

Stainless steel material

"SS" on the sheet stands for stainless steel. A Wonderful listing adds that titanium is available, so the quotation should state which metal is supplied.

870 g mass

That is the sheet's figure for the joint, while one Wonderful listing gives 865 g. The finished limb, with pelvic socket, knee, tube and foot, should be weighed after assembly.

100 kg load weight

Printed as "Load Weight 100 kg". The structural test report gives the standard and loading level behind it.

Angled top plate

In the photograph a long, thin plate rises at an angle from the dark joint body. Its fixing to the pelvic socket, whether laminated or bolted, appears on the drawing.

Dark joint body

The upper housing shows dark against the lighter parts below it. Any visible screws or adjusters are identified in the exploded view of the instructions.

Copper-coloured tube and tapered section

A long tube of copper or bronze colour runs downward, joined to the body by a tapered piece. Whether it ships with the joint is set out on the quotation.

Diagonal rod and collar

A rod of the same colour slopes from the front of the joint body to a collar on the tube. It appears to be the assist, and the manufacturer's parts list names it.

Flexion range on the drawing

The hip's flexion range governs sitting depth and alignment. The drawing and instructions for use carry it.

Connections below the hip

The distal connection that receives the knee or tube is specified on the drawing. Matching it to the chosen knee is a build decision for the workshop.

Maintenance of the elastic element

Elastic parts age with use. The maintenance schedule gives the inspection interval and the replacement part number.

Choose the 7E4 for a hip disarticulation or hemipelvectomy wearer under 100 kg, including carried loads, who wants help starting each swing and can sit safely once the recoil is set. It fits a service prepared to run a trial walk, a sitting test and a tiredness log before lamination, because no published data on this joint shows a reduction in effort. Look elsewhere for heavier wearers, for anyone unsettled by the forward return, or where the drawing's flexion range does not suit the sitting the wearer needs.

Medigear.uk lists the 7E4 for business buyers worldwide and can arrange delivery, installation, commissioning, familiarisation and service cover. Ask the enquiry team for the instructions for use with the assist setting procedure, the drawing with flexion range, the ISO 15032 test report, the material certificate and the declaration of conformity before ordering.

FAQ

Frequently Asked Questions

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

It stores energy as the hip moves and returns it by pushing the prosthetic thigh forward and down. The intended effect is a swing that starts with some help, so the wearer relies a little less on tilting the pelvis to launch the leg. The strength of that return, and how it is adjusted, comes from the instructions for use.

No study of this joint measures effort, so no savings can be promised. Walking at this level is generally costly. Chin and colleagues (American Journal of Physical Medicine & Rehabilitation, 2009) found seven older hip disarticulation users walked at 30.5 m/min with an oxygen cost of 0.639 ml/kg/m. In a wheelchai , the same group covered 63.1 m/min at 0.175 ml/kg/m. Any change in tiredness for an individual wearer is something to record at review, not assume.

The manufacturer's instructions for use describe the setting procedure, adjustment points, and tools needed, and the enquiry team sharem. In practice,,, the prosthetist balances two needs: enough return to hele swing and little enough resistance for the wearer to lowesmoothly r into a chaly. Testing on a low seat and a car seat during fitting shows whether that balance holds.

The range sits on the manufacturer's drawing and instructions for use, shared by the enquiry team. It decides how deeply the wearer can sit and how the socket and knee are aligned, so it belongs in the fitting notes before lamination.

The finished limb takes the rating of its lowest-rated part. Many knees and feet inthise range carry 125 kg or more, so this joint is usually the 100 k ceilingg. One Wonderful listing describes the code as suitable up to 100–110 kg, and the limb is planned at the lower figure until the structural test report states the rating and its test level.

ISO 15032 sets out structural test methods for components and assemblies of hip disarticulation prostheses. ISO 10328 covers the other lower-limb components below it, such as the knee and foot. The manufacturer's test report, shared by the enquiry team, names the standard and the loading level applied to the 7E4.

The image shows the joint fitted to a copper-coloured tube with a diagonal rod and collar, but the sheet listsonly the joine. The quotation itemises what physically arrives. A Wonderful listing describes the colour as silver, so the material certificate should be checked against the stainless steel on the sheet.

It is wrong for anyone whose body weight plus carried loads exceeds 100 kg. It is a poor match for a wearer who finds the forward return unsettling or who cannot sit down safely once the recoil is set to help the swing. An early clinical report from Ottawa (1984) found that all patients in that service rejected spring and cylinder extension assists, so a trial period before final lamination is sensible.

The 7E4 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. An EU MDR declaration dated 26 June 2022, hosted online under the manufacturer's name, lists "Single axis hip joint with extension assist (7E4)" as Class I under Rule 1, with SUNGO Europe B.V. as EU representative. A limb built around the joint for one named person is a custom-made device, and the workshop that builds it holds the manufacturer duties.

For hip joints and other prosthetic products, the NHS England-mandated route is NHS Supply Chain's Prosthetic Components and Associated Products framework. Its single lot, Artificial Limbs, is open from 24 November 2025 until 23 November 2027. NHS procurement routes require this framework, while public purchasers in other countries apply equivalent rules.