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Mark the center of the socket proximally and distally on the lateral side. Draw a line through
both marks from socket brim to the distal end of the socket.
Now position the socket such that the alignment reference line passes through the proximal
center mark of the socket. Set the socket flexion to somewhere between 3° and 5°; however,
the individual situation (e.g. hip flexion contracture) must be taken into account and, if neces-
sary, more flexion should be provided. Also pay attention to the ischial tuberosity to ground
distance.
Caution!
If the residual limb flexion is not taken into account, the joint will be positioned too far
to the front. This will lead to malfunction and premature wear. Use the integrated mov-
able pyramid adapter to optimize the alignment or for later alignment corrections.
Connect the socket and modular knee joint using a corresponding adapter (e.g. 4R41, 4R51,
4R55, 4R95, 4R111, 5R1=* Socket Adapter). Also see section 7.6.
7.2 Static Alignment Optimization using 743L100 L.A.S.A.R. Posture
(the following steps refer to Fig. 10)
The bench alignment can be substantially improved using L.A.S.A.R. Posture. In order to ensure
appropriate stability under load and when unlocking, please proceed as follows:
To make the load line visible, the transfemoral amputee stands on the L.A.S.A.R. Posture with
the prosthetic side on the force plate and with the other leg on the height compensation panel.
The prosthesis side should be sufficiently loaded. For the user's safety, this should take place
between parallel bars or with the aid of forearm crutches.
Now adapt the alignment by only adjusting the plantar flexion of the foot. The load line (la-
ser line) should be approx. 45 mm anterior to the joint axis (alignment reference point)
(see Fig. 10).
7.3 Using the Movable Pyramid Adapter
The option of moving the pyramid adapter permits easy adjustment of the prosthesis alignment.
This may be necessary, for example, in cases where hip flexion contracture is reduced as a result
of the prosthetic fitting.
If a flexion contracture is present, it may be advisable to make the alignment with the movable
pyramid adapter set to position 8 (Fig. 8). With decreasing flexion contracture, the pyramid adapter
can later be moved backwards step by step (towards pos. 1), and the tube length and dorsal
flexion of the foot adapted, if necessary.
Moving the Pyramid Adapter
1)
Unlock the knee joint and bring it into a right angle position.
Pull the O-ring (Fig. 1, item 1) down (distally) over the plastic flap. Open the plastic flap.
2)
Unscrew the Allen screw (wrench size 5 mm) by two turns (Fig. 4). The toothing on the plastic
housing permits incremental movement of the pyramid adapter in relation to the knee axis over
a length of approx. 15 mm. To document the position of the pyramid adapter, the scale 1 – 8
on both sides of the upper joint section along with the bar mark on the pyramid can be used.
Note!
Removal of the Allen screw (wrench size 5 mm) is not possible. Replacement of the
screw, lock washer, screw washer, tooth rack and of the pyramid adapter is not
intended neither. These components are not available as spare parts.
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