Otto Bock Defender Instructions For Use Manual page 16

TF bench alignment
► Observe the information in the prosthetic knee joint instructions for use.
5.1.3 Static Alignment
• Ottobock recommends checking the alignment of the prosthesis using
the L.A.S.A.R. Posture and adapting it as needed.
5.1.4 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.
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 direction. 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.
Heel too soft
Symptoms
• Foot makes full ground contact too
quickly
• Forefoot feels too stiff
• Knee goes into hyperextension
Heel too hard
Symptoms
• Fast knee flexion, low stability
• Transition from heel strike to toe-off too
fast
• Energy return feels low
Prosthetic foot too stiff
Symptoms
• Minimal rollover movement of the pros­
thetic foot at low walking speed (long
full ground contact)
Prosthetic foot too soft
Symptoms
• Clicking noise at the start of ground
contact.
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Possible solutions
• Shift prosthetic socket forward relative
to the foot
• Use a heel wedge
Possible solutions
• Shift prosthetic socket back relative to
the foot
• Reduce the heel stiffness (shift or
remove heel wedge)
Possible solutions
• Select prosthetic foot in lower stiffness
Possible solutions
• Select prosthetic foot in higher stiff­
ness