ASI (Angled Subtalar Implant)
The Angled Subtalar Implant (Model ASI) is a one-piece, ultra-high molecular weight polyethylene implant intended to correct collapsing pes valgo planus using an arthroereisis procedure. The implant is an angled disk and peg design offered in three sizes with either a regular or thicker disk. The implant is placed into the dorsal lateral surface of the calcaneus anterior and angled such that the superior face is approximately parallel to the leading wall of the posterior facet of the talus (Austin-Flake placement). The lateral leading wall of the posterior facet of the talus contacts the superior surface of the implant to prevent excessive pronation of the subtalar joint. The device is approved to be fixed with bone cement.
Features and Benefits
- Angled articular surface to block the leading wall of the talus
- Softened edges reduce the possibility of wear particulate
- Fully cannulated to guide accurate insertion. Apertures allow for soft tissue in-growth.
- Two thicknesses in each size for an improved fit
- Color-coding facilitates surgical procedure
Indications
The ASI is intended to treat hyperpronated foot and stabilize the subtalar joint. It is intended to prevent forward progression of the lateral talus and also prevent adduction and depression of the talus on the calcaneus, thus reducing excessive pronation and the resulting sequela. Examples include:
- Flat foot treatment in children and adolescents Congential flat foot
- Unsuccessful long-term orthopedic treatment (shoes, insoles…)
- Tarsal coalitions (after resection of tarsal coalitions)
- Painful flat foot
- Posterior tibial tendon dysfunction
- Paralytic flat foot
- Subtalar instability
Contraindications
- Significant bone demineralization
- Inadequate neurovascular status
- Inadequate skin or musculotendious system
- Spastic foot
- Inadequate bone stock
- Psychologically unsuitable patient
- Active sepsis
Ordering Information |
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A Day Kit for the ASI is available.
Supporting Documentation
Futura ASI Brochure
Ordering Information
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