Advancing extra-osseous talotarsal stabilization

Phoenix STS (Sinus Tarsi Stent) is a 3rd-generation extra-osseous talotarsal stabilization (EOTTS) implant system designed to stabilize recurrent talotarsal joint instability while preserving physiologic joint motion.

Phoenix STS is designed to help stabilize recurrent talotarsal joint dislocation (RTTJD), a pathologic instability between the talus and calcaneus associated with excessive pronation and abnormal lower-extremity biomechanics.

Unlike osteotomies, arthrodesis procedures, or tendon transfers, EOTTS is minimally invasive and focuses on internal stabilization of the talotarsal mechanism without permanently altering osseous anatomy. Potential advantages may include preservation of natural joint motion, a smaller incision, reduced surgical trauma, faster recovery, a reversible implant option, and the ability to combine with adjunctive procedures.

No. Phoenix STS is not an arthrodesis procedure. The goal is to stabilize excessive talotarsal motion while maintaining physiologic range of motion.

Phoenix STS is manufactured from implant-grade titanium alloy engineered for biocompatibility, strength, and durability.

Patients may present with heel pain / plantar fasciitis, medial ankle pain, sinus tarsi pain, progressive bunion deformity, and progressive arch collapse.

Diagnosis may include clinical examination, weight-bearing radiographs, dynamic gait evaluation, and weight-bearing fluoroscopic assessment. Dynamic imaging can provide valuable insight into talotarsal instability during stance and gait.

Yes. Phoenix STS may be performed as a standalone stabilization procedure, combined with soft tissue balancing, bunion correction, tendon repair procedures, or pediatric flatfoot reconstruction strategies. Procedure selection should always be based on patient pathology and surgeon judgment.

Yes. One of the advantages of EOTTS is that the implant may be removed if clinically indicated.

In experienced hands, isolated EOTTS implantation may often be completed in approximately 15–20 minutes.

Depending on state regulations, anesthesia considerations, facility capabilities, and patient selection, some surgeons may perform EOTTS procedures in office-based procedural environments.

Yes. Phoenix STS is designed to stabilize excessive talotarsal motion while preserving physiologic range of motion.

Weight-bearing fluoroscopic principles may provide valuable insight into dynamic instability and correction assessment.

Phoenix STS may be considered for skeletally immature and mature patients depending on clinical presentation and surgeon assessment.

Some patients may continue to benefit from orthotic support depending on pathology, activity level, and overall biomechanical needs.

Contraindications may include active infection, severe osseous deformity requiring reconstruction, inadequate anatomy, certain inflammatory arthropathies, and severe instability requiring alternative procedures. Please refer to the Instructions for Use (IFU) for complete indications, contraindications, warnings, and precautions.

Astra OrthoMed offers hands-on cadaver training, surgical observation opportunities, didactic RTTJD education, weight-bearing fluoroscopic training, patient selection guidance, and practice integration support.

Phoenix STS is designed and manufactured under applicable quality system standards. Regulatory availability may vary by country or region.

Contact Astra OrthoMed to learn more about surgeon training events, cadaver labs, proctorship opportunities, and Surgeon Advocate programs.