12 | Ottobock
3 Technical data
Article number
3R23
3R32
Proximal connection
Lamination anchor
Distal connection
Adjustment pyramid
Knee flexion angle
110°
Weight
880 g
655 g
System height
99 mm
System height from alignment reference point
17 mm
System height until alignment reference point
82 mm
Max. patient weight
125 kg / 275 lbs
Mobility level
1
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. Function of the joint is influenced by the posi-
tion of the axes. In extension, the instantaneous centre of rotation is located above the pyramid
adapter and behind the alignment reference line, thus providing knee stability in the stance phase.
The advantages of the 3R23 and 3R32 Knee Joints 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 position-
ing 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.
For precise clamping of the knee joint in the 743L200 L.A.S.A.R Assembly we recommend
using the special devices 743Y89=1 and 2.
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. 6)
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 align-
ment reference line should run 0 mm in front of the upper anterior axis (alignment refer-
ence 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 plateau.
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.
