Phoenix™ STS is an implant designed to help stabilize the talus—the ankle bone—
when it moves excessively during standing and walking.
It is used in the treatment of talotarsal joint instability, a condition involving abnormal movement or alignment where the talus meets the bones beneath it.
Why Would the Foot Need Stabilization?
When you stand, the bones and joints of your feet must work together to support your body weight.
In some people, the talus moves too far forward, inward, or downward when the foot is loaded.
This may contribute to changes such as:
• The arch flattening when standing
• The foot rolling inward excessively
• Changes in foot alignment
• Increased stress on surrounding tissues
A foot with flexible instability may look different when sitting than it does when standing.
Not everyone with flat feet has talotarsal joint instability, and not everyone with foot pain needs surgical treatment. A complete evaluation is needed to understand what is happening.
What Does Phoenix STS Do?
Phoenix STS is placed through a minimally invasive procedure into the sinus tarsi, a naturally occurring space between the ankle bone and heel bone.
Because the implant is extra-osseous, it sits outside the bone. The procedure does not require cutting or drilling into bone, and the implant is not attached to the foot with screws.
Once positioned, Phoenix STS is designed to:
• Help stabilize the bones of the foot
• Limit excessive movement during standing and walking
• Support improved foot alignment
• Preserve normal joint motion
Rather than changing the structure of the bones, Phoenix STS works within a natural space in the foot to provide internal stability where it is needed.
How Can Phoenix Help?
Phoenix addresses the mechanical instability identified within the foot.
By helping stabilize the talus during weight-bearing, the implant may support a more stable relationship between the bones of the foot while the patient stands and walks.
Phoenix is not intended to treat every case of flat feet, heel pain, overpronation, or foot deformity. It may be considered when a qualified foot and ankle surgeon determines that flexible talotarsal joint instability is part of the patient’s condition.
Who May Be Evaluated for Phoenix? A foot and ankle specialist may consider several factors, including:
• How the foot changes from sitting to standing
• Whether the instability is flexible or fixed
• Standing foot alignment
• Symptoms and activity limitations
• Weight-bearing imaging
• Other conditions affecting the foot or ankle
The decision is based on the individual patient—not simply the appearance of a low arch.
Quick Takeaways
Could Phoenix Be Right for You?
The first step is understanding how your foot behaves under weight-bearing. If your arches flatten when you stand, your feet roll inward excessively, or recurring symptoms are affecting your ability to walk and stay active, consider speaking with a qualified foot and ankle specialist.
It is used in the treatment of talotarsal joint instability, a condition involving abnormal movement or alignment where the talus meets the bones beneath it.
Why Would the Foot Need Stabilization?
When you stand, the bones and joints of your feet must work together to support your body weight.
In some people, the talus moves too far forward, inward, or downward when the foot is loaded.
This may contribute to changes such as:
• The arch flattening when standing
• The foot rolling inward excessively
• Changes in foot alignment
• Increased stress on surrounding tissues
A foot with flexible instability may look different when sitting than it does when standing.
Not everyone with flat feet has talotarsal joint instability, and not everyone with foot pain needs surgical treatment. A complete evaluation is needed to understand what is happening.
What Does Phoenix STS Do?
Phoenix STS is placed through a minimally invasive procedure into the sinus tarsi, a naturally occurring space between the ankle bone and heel bone.
Because the implant is extra-osseous, it sits outside the bone. The procedure does not require cutting or drilling into bone, and the implant is not attached to the foot with screws.
Once positioned, Phoenix STS is designed to:
• Help stabilize the bones of the foot
• Limit excessive movement during standing and walking
• Support improved foot alignment
• Preserve normal joint motion
Rather than changing the structure of the bones, Phoenix STS works within a natural space in the foot to provide internal stability where it is needed.
How Can Phoenix Help?
Phoenix addresses the mechanical instability identified within the foot.
By helping stabilize the talus during weight-bearing, the implant may support a more stable relationship between the bones of the foot while the patient stands and walks.
Phoenix is not intended to treat every case of flat feet, heel pain, overpronation, or foot deformity. It may be considered when a qualified foot and ankle surgeon determines that flexible talotarsal joint instability is part of the patient’s condition.
Who May Be Evaluated for Phoenix? A foot and ankle specialist may consider several factors, including:
• How the foot changes from sitting to standing
• Whether the instability is flexible or fixed
• Standing foot alignment
• Symptoms and activity limitations
• Weight-bearing imaging
• Other conditions affecting the foot or ankle
The decision is based on the individual patient—not simply the appearance of a low arch.
Quick Takeaways
- Phoenix STS is a surgically placed implant.
- It is used in the treatment of talotarsal joint instability.
- It is designed to stabilize the talus and limit excessive movement.
- It allows normal talotarsal joint motion rather than eliminating all movement.
- A qualified foot and ankle surgeon must determine whether it is appropriate for an individual patient.
Could Phoenix Be Right for You?
The first step is understanding how your foot behaves under weight-bearing. If your arches flatten when you stand, your feet roll inward excessively, or recurring symptoms are affecting your ability to walk and stay active, consider speaking with a qualified foot and ankle specialist.
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