Otto Bock 3R15 Instructions For Use Manual page 13

Distal system height up to align-
ment reference point
Max. user weight
Mobility Grade
4 Handling
4.1 Alignment
The three-dimensional arrangement of the prosthetic socket and the modular components affects
the static and dynamic functions of the prosthesis.
The advantages of the 3R15 / 3R49 can only be made optimal use of in case of a correct alignment.
The optimal residual limb position must be anticipated when positioning the socket connec-
tor. Plumb lines in the frontal and sagittal planes (drawn from the hip joint's centre 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 make the bench alignment using an alignment tool such as 743L200 L.A.S.A.R. Assembly.
2. Then use 743L100 L.A.S.A.R. Posture for static alignment optimisation.
4.1.1 Bench alignment with alignment tool
(the following steps refer to Fig. 11)
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, the alignment
reference line should run 10 mm in front of the upper anterior axis (alignment reference
point). At that point the pyramid base should be horizontal. Pay attention to the knee ground
distance and outward rotation of the knee (adapter inserts provide for a rotation of approx. 5°).
Recommended positioning of the alignment reference point: 20 mm above the medial tibial pla-
teau.
Connect the foot to the modular knee joint using a tube adapter.
Mark the centre 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
centre mark of the socket. Set the socket flexion to somewhere between 3° and 5°; however,
the individual situation (e.g. hip joint contractures) must be taken into account and, if necessary,
more flexion should be provided. Also pay attention to the ischial tuberosity to ground distance.
Attention!
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. If required, use the
4R118 Adapter Plate for optimal positioning of the prosthetic knee joint.
Connect the socket and modular knee joint using a corresponding adapter (e.g. 4R111, 4R41,
4R55, 4R51 Socket Adapter).
3R15, 3R49
1 mm
100 kg
1 + 2
1 mm
100 kg
1 + 2
Ottobock | 13