What is My Surface Arthoplasty Risk Index - SARI?

According to Beaulé, the following patient selection factors can favorably impact modern resurfacing outcomes:

no large femoral head cyst;
no osteopenia;
younger than 65 years old; and
no prior hip surgery.
“My current ideal indications for hip resurfacing are patients age less than 60 years, risk index less than or equal to 3,” he said.

The risk index — surface arthroplasty risk index (SARI) — is a tool for determining how various factors may interact for a reproducible outcome.

SARI gives two points each for a femoral head cyst >1 cm3 and patient weight <82 kg, and one point each for previous hip surgery and UCLA activity score >6, for a total possible score of 6. The higher the patient’s SARI, the greater his or her risk of implant failure.

Beaulé applied the index in a study he did of 400 patients following resurfacing arthroplasty. The overall series showed a survivorship of 94% at 4 years, which most would consider suboptimal compared to THA.

After grouping patients by SARI, survivorship increased to 97% in those with SARI equal to or less than 3. But it decreased to 89% when the index was equal to or greater than 3.


 

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