TTC & Hindfoot Fusion | Case Report – DynaNail® TTC Fusion System TTC And Hindfoot Fusion Case Report DynaNail TTC | Page 2

Background
The DynaNail® TTC Fusion System is intended for use in tibiotalocalcaneal (TTC)
fusion to treat various conditions including:
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Rheumatoid Arthritis
Osteoarthritis
Severe Deformities
Degenerative Conditions
Post-Traumatic Injury
Failed Total Ankle Arthroplasty
Non-Union from Ankle or Subtalar Arthrodesis
Compressive
Element
DynaNail contains an internal Nickel Titanium (NiTiNOL) Compressive Element
that adapts to changes in loading across the joint. The Element is stretched
intra-operatively (up to 6 mm) and fixed with screws in the calcaneus and tibia.
After surgery, the Compressive Element can recover its stretched length in
response to bone resorption or settling. This unloading allows DynaNail to
sustain compression across the joint.
Sliding
Element
Unstretched
Position
Element Stretched
outside
Outer Nail Body
The figure to the left shows the axial
compressive force applied by DynaNail in
comparison to static intramedullary (IM)
nails and an external fixation frame.
Whereas static IM nails lose compression
after 1 mm resorption, DynaNail maintains
compression for up to 6 mm of resorption,
similar to an external frame. 1,2
1
Yakacki et al. Pseudoelastic nailing for tibio-talo- calcaneal
arthrodesis. Expert Rev Med Devices, 2011; 8(2):159-166.
2
Data on File. MedShape, 2013.
2