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Category:   SportsIntroduction/Purpose:   Bioabsorbable suture anchors have been popularized due to potential for osseous integration, less interference with diagnostic imaging, and ease of use. Recently, ultrasound assisted suture anchor systems have been introduced with the benefits of obtaining interdigitation with cancellous bone while maintaining a minimal footprint. In a cadaveric study, ultrasound assisted suture anchors demonstrated a similar pullout strength and less system displacement when compared to a benchmark bioabsorbable anchor system. However, the failure and complication rates of ultrasound assisted bioabsorbable anchors has never been demonstrated in a clinical setting. We studied the Stryker SonicAnchor by examining complication rates in foot and ankle procedures and secondarily determined the efficacy by evaluating clinical outcomes of surgeries using this anchor system.Methods:   A retrospective analysis was performed on all patients treated by the primary investigator using the Stryker SutureAnchor between the dates of May 2016 and February 2018. We included all patients for which the anchor was used during surgery with at least 2 year followup including VAS and FAOS scores. We recorded baseline demographic information as well as the type of surgery patients underwent. We recorded all intraoperative and postoperative complications for these surgeries. In addition, we compared preoperative and postoperative clinical scores.Results:   57 patients met inclusion criteria. On average, patients were 53 years old at the time of surgery. Mean followup was 32.8 months. Mean BMI was 30.36. Three patients reported current tobacco use (5.3%), four patients (7.0%) had type II diabetes mellitus at the time of their surgery, and only one patient (1.8%) had osteoporosis. Common procedures were Achilles repair including Haglund’s resection, peroneal surgery, and lateral ligament reconstruction. There were two deep infections requiring reoperation, one medial malleolus stress fracture following total ankle replacement, one metatarsal stress fracture not involving the surgery site, and one DVT. No reports of anchor pullout or soft tissue repair failure. VAS and FAOS scores improved from 6.2 to 1.2 and 54.3 to 93.9.Conclusion:   In our review of 57 patients operated on with the SonicAnchor with at least two year followup, there were zero cases of complications stemming from the anchor including anchor pullout or soft tissue repair failure. Overall, patients improved tremendously in their clinical outcome scores across a wide range of different procedures. Previous studies have demonstrated the biomechanical strength of the SonicAnchor and our review supports its clinical safety and efficacy in long-term clinical followup.

Clinical Safety and Outcomes of a Novel Ultrasound Assisted Bioabsorbable Suture Anchor in Foot and Ankle Surgeries