Ambroise UTX-STABIL Manuel - Page 8

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ITEM NUMBERS

UTX Lateaal Left:

400420

UTX Lateral Right:

400421

UTX Medial Left:

400422

UTX Medial Left:

400423

UTX-ESF Lateral Left:

400500

UTX-ESF Lateral Right:

400401

UTX-ESF Medial Left:

400402

UTX-ESF Medial Right:

400503

OPERATION OF THE SWING

The UTX-SWING is locked against flexion and extension during the stance phase of walking.

At the end of the stance phase the knee hinge automatically unlocks. During the swing phase a

natural knee flexion is possible. If the leg extends again at the end of the swing phase, the knee

falls automatically into it's lock again.

Locking

The UTX SWING falls into it's lock when the knee hinge is sufficiently stretched. A ratchet

jumps into the lock position prohibiting further bending of the knee. An extension stop in the

hinge prevents overstretching of the knee.

Unlocking

The knee hinge of the UTX-SWING orthosis is kept locked by a ratchet. The hinge will remain

locked until the end of the stance phase of walking. Then, the hinge is unlocked automatically. In

order to unlock the knee hinge at the end of the stance phase, you need to simultaneously reach

two conditions: First, a small dorsiflexion with the ankle (minimum of 5 degrees) should be made.

This is a normally occurring ankle motion during the stance phase when the foot remains on the

floor and the leg moves forward. This is what happens in the UTX: the ankle hinge is attached to

the ratchet in the knee hinge via a cable. This ratchet can only be pulled from the lock when it is

released. This requires a (very small) knee extension. This is the second condition that must be

met. If either is missing, the knee hinge will not be unlocked.

Stretching the knee

Research has shown that stretching the knee at the end of the stance phase is part of normal

human gait. So the movement is natural. It requires certain residual functions. Persons who are

in possession of these residual functions, usually learn to master the technique as described

above. Persons who do not have sufficient rest function(s), can generally make optimal use of a

UTX-STABIL orthosis (optionally in combination with UTX-ESF)

There are three ways to stretch the knee at the end of the stance phase:

Stretching the hip with still present (partially) active hip extensors (3 MRC muscle strength

is required), in particular, M. gluteus maximus, (Hamstrings: M. Semimembranosus and

Semitendinosus, and M. Biceps femoris).

Stretching the knee with still present (partially) active knee extensors (3 MRC muscle

strength is required) M. quadriceps femoris.

By using knee hyperextension. (See also UTX selection protocol.)

In addition to this automatic release, it is also possible to manually unlock the UTX-SWING

Product information | +31 (0)53 4302 836 | [email protected] | www.ambroise.nl

UTX.2018.01

KNEE FUNCTION

SWING / STABIL / FREE

STABIL / FREE

ADDITION

FS / POST / DZ / ESC (SWING only)

always FS / POST / DZ / ESC (SWING only)

always FS

Figure 4: UTX-FS

Figure 5: UTX-ESC