Ankle Arthrodesis
Results
90% fusion rates
Lose
70% sagittal plane ROM
Disadvantages of Arthrodesis
Non union rates up to 12%
Decreased gait speed
Poor mobility over uneven surfaces
range of motion
Head size
Issues
Wear
Stability
Normal feel of hip
Increased ROM
Wear
Large head
- increase volumetric wear
- less penetrative / linear wear
Small head
- increased linear wear
- decreased volumetric wear
Background
Anatomy
Bony
- 90% load through plafond to talus
- 10% load through lateral talofibular articulation
Ligaments
A. Lateral Ligament Complex
ATFL (Anterior Talo-Fibular Ligament)
- tight in plantar flexion