Wonderful 3F66-1

The 3F66-1 is used in paediatric prosthetic clinics, children's limb-fitting centres, orthopaedic and tumour surgery services and rehabilitation hospitals. Its users are children with knee disarticulation, whether after trauma, after surgery for a bone tumour or from a congenital limb difference at the level of the knee.

The mechanism is why clinics reach for a dedicated joint. Through-knee amputation keeps the whole femur, and in children that long thigh is a real asset: it gives strong control over the prosthesis and, often, an end that can carry weight. The challenge is space. With the thigh at full length, a joint has to sit directly beneath the residual limb to keep the knee centre in a workable place. The 3F66-1 is designed for exactly that position, and its 175° range of flexion lets the knee fold completely when the child sits or kneels.

Prosthetists build the through-knee socket, then align the 3F66-1 beneath it. Physiotherapists work with the child on walking, getting up from the floor and sitting, making use of the long lever the thigh provides. Families see a leg that bends fully at home and keeps up with play.

Children grow, and that brings them back to clinic regularly for socket changes and lengthening. Because the joint is mechanical and rated to 75 kg, it can stay in use across several fittings, through primary years and into the teens. Typical uses include a first knee after paediatric knee disarticulation, a knee for a child born with a knee-level difference, and a knee for a preteen with a through-knee limb. In every case, it lets the child use the full length of the thigh.

Uses the whole thigh

Designed for knee disarticulation, the joint sits beneath the residual limb so the full femur length can be used.

Strong control from a long lever

The long thigh of a through-knee limb gives the child strong control of the prosthesis.

Folds fully

A 175° flexion range allows kneeling, floor sitting and comfortable sitting in chairs.

Light for a child

At 480 g in 7075 aluminium, the joint is easy for a child to swing through.

Covers childhood into the teens

A 75 kg rating suits boys and girls from early childhood into their teenage years.

Stays across fittings

The joint can remain in use as sockets are changed and the leg is lengthened.

Mechanical simplicity

With no electrical parts, there is nothing to charge.

Fits the review cycle

Its upkeep fits into the regular reviews children already have.

Item number 3F66-1

3F66-1 identifies Wonderful's aluminium knee disarticulation joint for children.

Knee disarticulation design

The joint is made for the through-knee level.

7075 aluminium alloy

The frame is 7075 aluminium alloy.

Weight

The joint weighs 480 g.

Load rating

It carries users up to 75 kg.

175° flexion

The flexion range reaches 175°.

Paediatric sizing

The joint is designed for children.

Position below the residual limb

The joint is built to sit directly beneath a through-knee socket.

Full folding

The knee folds completely for kneeling and sitting.

Mechanical operation

The joint uses no power.

Suits growing users

The rating covers children into their teens.

Manufacturer quality system

Wonderful holds an ISO 13485 quality management certificate.

The 3F66-1 suits paediatric services fitting children at the through-knee level, where the full thigh is an asset that should not be wasted. Its strength is the mechanism it is built around: a joint designed to sit directly beneath a long residual limb, so the child keeps the control that the whole femur gives while the knee still folds through 175°. At 480 g in 7075 aluminium and rated to 75 kg, it serves children from early years into their teens. For clinics and families, it is a knee made for the level of the limb and the age of the child.