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The primary objective of the current study was to evaluate the FI/CFI of RCTs comparing HA and PT in the treatment of FAIS to determine the robustness of results reported to be statistically significant. The most important finding of the current study was that the median and mean CFI of included studies were 13 and 15.84, respectively. This means that, on average, it would take approximately 16 subjects to change the outcome to be no longer significant. CFI for included studies tended to be greater than the loss to follow-up, which is suggestive that the findings observed may be robust enough to resist differences that could have resulted from those patients.