I understand that the results of sham-controlled trials can be difficult to accept, especially when they challenge prior beliefs about a procedure’s efficacy. However, these trials are essential for answering the fundamental question: Does it really work?
Even if you disagree with their conclusions, I urge you not to rely on the Fragility Index in discussions. It is a completely misleading and mal-aligned concept.
Nonetheless, Pearsall et al. attempted to revive it, stating:
The unstable findings in partial meniscectomy and vertebroplasty sham surgical RCTs undermine their study conclusions and recommendations. We recommend using fragility analysis in future sham surgical RCTs to contextualize statistical findings.
The reality is that the Fragility Index has no meaningful interpretation in the real world—zero.
In response, my colleague Teemu Karjalainen and I wrote:
As Gail Potter astutely points out, FI sidesteps critical considerations like effect size and confidence intervals, “deemphasizing the key scientific question” and contributing more to the cacophony of confusion than to the symphony of statistical enlightenment
We further concluded
… rather than resorting to desperate attempts to wrangle uncertainty through the elusive con-
cept of fragility analysis, let us remember that the true elegance of medical research lies in the pursuit of meaningful, clinically relevant answers—answers that can improve patient care and advance our understanding about the underlying disease model
Let’s continue asking meaningful questions for the sake of our patients. Sham-controlled trials are here to stay, and naive criticism based on arbitrary statistical constructs only adds noise without advancing orthopaedic research.