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Nine-year component survivorship with STAR device linked to survivorship at 15 years

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TORONTO — Patients who had 9 years of component survivorship following arthroplasty using the Scandinavian Total Ankle Replacement were more likely to have components that survived to 15 years with minimal depreciation, according to results presented here.

“[Scandinavian Total Ankle Replacement] STAR ankles with survivorship at 9 years are likely to survive to 15 years,” Ariel A. Palanca, MD, said in her presentation at the American Orthopaedic Foot & Ankle Society (AOFAS) Annual Meeting. “Patients overall do well with minimal depreciation of the AOFAS scores.”

Palanca and colleagues determined metal component survivorship, assessed patient functionality and outlined complications and the need for secondary procedures among 24 patients who underwent replacement with the STAR device and had a 15.7-year follow-up.

Ariel A. Palanca

Results showed a metal component survivorship of 87.5% with three failures. Overall, Palanca noted 71.4% of patients ambulated without the need of assisted devices; 14% required an ankle foot orthosis; and more than 60% of patients reported no pain or slight pain at 15-year follow-up. At 15 years, AOFAS scores increased from a preoperative score of 39.6 points to 71.6 points. Investigators found the pain component of the score decreased by 3.2 points and the function component of the score decreased by 5.3 points, according to results.

“For adjacent joint arthritis, only one subtalar joint that showed adjacent joint arthritis needed fusion,” Palanca said. “Osteolysis was seen in 28.6%. Heterotopic ossification was seen in greater than 60%.”

Results showed 11 of 21 patients with metal survivorship needed at least one subsequent procedure and two patients required two subsequent procedures, with almost 80% occurring between the 9-year to 16-year mark.

“We saw three polyethylene fractures, and these occurred at an average of 12.3 years,” Palanca said. – by Casey Tingle

Reference:

Palanca AA, et al. STAR ankle: Patient outcomes at 15-year follow-up. Presented at: American Orthopaedic Foot & Ankle Society Annual Meeting; July 21-23, 2016; Toronto.

Disclosure: Palanca reports she is a paid consultant for Stryker.