Instructions For Use - Otto Bock Defender FS3 Instructions For Use Manual

Defender™ Instructions for Use
Product Number: FS3
Assembly
Bench Alignment
Dynamic Alignment
Troubleshooting
Instructions for Use (R-720-062, Rev. H)
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Defender.indd 6
The Defender™ foot module is pre-assembled consisting of a graphite component (keel),
Spectra™ sock, and foot shell. Foam stiffening bumpers for increasing heel stiffness are
provided. After dynamic alignment, torque pyramid adjustment screws to the
manufacturer's specifications. Secure pyramid adjustment screws with a thread locking
adhesive (i.e., Loctite 242).
Prior to donning the prosthesis:
• Plantarflex/Dorsiflexion foot to match the shoe heel height.
• Adduct/Abduct socket to provide appropriate frontal plane angle.
• Flex/Extend socket to provide appropriate sagittal plane angle.
• Move the socket linearly to ensure the weight line falls along the anterior edge of the
pylon (see illustration).
During loading response, the heel lever stores energy and releases it during midstance.
This action provides momentum for the keel to store energy and release it during terminal
stance. To optimize the heel to toe rollover motion, adjust the following variables:
• Anterior/posterior foot placement
• Dorsiflexion/plantarflexion
• Heel stiffness
Heel too soft
Heel too hard
Foot module too stiff
Foot module too soft
Symptoms
• Foot flat occurs too rapidly
• Toe feels excessively stiff
• Knee hyperextension
Solutions
• Shift socket anteriorly in relation to the foot
• Attach foam stiffening bumpers
Symptoms
• Rapid knee flexion, instability
• Heel to toe progression to rapid
• Lack of energy return sensation
Solutions
• Shift socket posteriorly in relation to the foot
• Verify appropriate foot module category
Symptoms
• Flat spot in rollover motion at slow cadences
Solutions
• Consider a lower category foot module
Symptoms
• Clicking noise at initial contact
• Excessive toe deflection with high impact activity
Solutions
• Consider a higher category foot module
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FS3 Defender™
10.02.2021 11:05:02