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6.2 Flexion Release/Unlocking
Flexion release is activated via the pull cable, which is attached to the perlon cord loop. The lock
unlocks with a stroke length of 15 mm and a force of up to 35 N. Another way to achieve flexion
release is to press the lock latch (Fig. 2, item 1, arrow). For safety reasons, unlocking of the knee
joint becomes more difficult with increasing flexion moment loading.
The patient may unlock the joint before or after sitting down. To unlock the 3R41, the patient
either relieves most of the load on the prosthesis or applies load on the toes (extension moment)
while unlocking the joint. While holding the unlocked state (pressed lock latch or pulled "lock"),
the patient initiates the flexion movement.
6.3 Locking
After standing up, the patient automatically locks the joint with an extension moment with full ex-
tension up to the extension stop.
6.4 Plastic Flap
A movably attached plastic flap (Fig. 2, item 3) covers the anterior joint space over the entire flexion
range and thus protects the cosmetic foam cover and the fingers from getting jammed.
6.5 Connection
The pyramid adapter connects the knee joint proximally (to the socket). Distal connection is pro-
vided by the clamp of the lower joint section into which the 30 mm tube of the tube adapter is
inserted.
7 Alignment Recommendations and Assembly
The three-dimensional arrangement of the prosthetic socket and the modular components affects
the static and dynamic functions of the prosthesis. Function of the joint is influenced by the position
of the joint axis. In the extended position, the joint axis is located posterior to the alignment reference
line (Fig. 10), which ensures sufficient stability and requires little effort for unlocking (Fig. 10).
The optimal residual limb position must be anticipated when positioning the socket con-
nector (Fig. 9). Plumb lines in the frontal and sagittal planes (drawn from the hip joint's center
of rotation and marked during plaster cast taking and trial fitting of the test socket) will facilitate
correct positioning of the lamination anchor or socket adapter.
To align the prosthesis please proceed in two steps:
1)
First, bench alignment using an alignment tool such as 743L200 L.A.S.A.R. Assembly (see
section 7.1).
2)
Then static alignment optimization using 743L100 L.A.S.A.R. Posture (see section 7.2).
7.1 Bench Alignment with Alignment Tool (the following steps refer to Fig. 9)
Position the middle of the foot 30 mm anterior to the alignment reference line.
Add 5 mm to the required heel height of the foot. Set correct outward rotation of the foot.
Clamp the knee joint using the appropriate adapter inserts. For bench alignment, place the
joint axis (alignment reference point) 15 mm posterior to the alignment reference line.
At that point the pyramid base should be horizontal. Pay attention to the knee ground dis-
tance and outward rotation of the knee (adapter inserts provide for a rotation of approx. 5°).
Recommended positioning of the alignment reference point is on the level of the medial tibial
plateau.
Connect the foot to the modular knee joint using a tube adapter. Also see section 7.5.
14
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