Bench alignment process
Anterior placement, middle of the prosthetic foot to the align
ment reference line: 30mm
Connect the prosthetic foot and prosthetic socket using the
chosen adapters. The instructions for use of the adapters
must be observed.
Determine the centre of the prosthetic socket with the 50:50
gauge. Align the prosthetic socket centrally to the alignment
reference line.
Socket flexion: Individual residual limb flexion +5°
Frontal plane
Alignment reference line of prosthetic foot: between big toe
and second toe
Alignment reference line of prosthetic socket: along the lat
eral patella edge
Observe the abduction or adduction position.
TF bench alignment
►Observe the information in the prosthetic knee joint instructions
for use.
5.2 Static Alignment
• Ottobock recommends checking the alignment of the prosthesis
using the L.A.S.A.R.Posture and adapting it as needed.
• If necessary, the alignment recommendations (TF modular leg
prostheses: 646F219*, TT modular leg prostheses: 646F336*)
may be requested from Ottobock.
5.3 Dynamic Trial Fitting
• Adapt the alignment of the prosthesis in the frontal plane and the
sagittal plane (e.g.by making angle or slide adjustments) to
ensure an optimum gait pattern.
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•TT fittings: Make sure that physiological knee movement in the
sagittal and frontal plane is achieved when the leg begins to bear
weight after the heel strike. Avoid medial movement of the knee
joint. If the knee joint moves in the medial direction in the first half
of the stance phase, move the prosthetic foot in the medial direc
tion. If the medial movement occurs in the second half of the
stance phase, reduce the exterior rotation of the prosthetic foot.
• Remove the plastic protector from the pyramid after completing
the dynamic fitting and the walking exercises.
5.4 Optional: Installing the foam cover
The foam cover sits between the prosthetic socket and prosthetic foot.
It is cut longer in order to compensate for the movements of the pros
thetic foot and prosthetic knee joint. During flexion of the prosthetic
knee joint, the foam cover undergoes posterior compression and
anterior elongation. The foam cover should be stretched as little as
possible in order to increase its service life. There is a connecting ele
ment (such asa connection plate, connection cap or connection cov
er) on the prosthetic foot.
>Required materials: degreasing cleaner (e.g.634A58 isopropyl
alcohol), 636N9 contact adhesive or 636W17 plastic adhesive
1) Measure the length of the foam cover on the prosthesis and add
the length allowance.
TT prostheses: Distal allowance for movement of the prosthetic
foot.
TF prostheses: Allowance proximal of the knee rotation point for
flexion of the prosthetic knee joint and distal allowance for move
ment of the prosthetic foot.
2) Cut the pre-shaped foam cover to length and fit it in the proximal
area on the prosthetic socket.
3) Pull the foam cover over the prosthesis.
4) Set the connecting element onto the footshell or prosthetic foot.
Depending on the version, the connecting element engages in the
edge or rests on the foot adapter.
5) Install the prosthetic foot on the prosthesis.
