This 2003 JBJS editorial announced the journal's formal adoption of Level-of-Evidence ratings for all clinical articles. It introduces a five-level hierarchy applied across four study types: therapeutic, prognostic, diagnostic, and economic/decision modeling. The framework sets the vocabulary that every orthopaedic trainee uses when critically appraising the literature.
Every time you read a study, the first question is: what level of evidence is this, and does the conclusion match that level? This framework gives you the answer before you read the results. A retrospective cohort is Level III therapeutic evidence at best — it can generate hypotheses, but it cannot establish treatment superiority the way an RCT can.
Use the 80% follow-up rule as a quick quality filter: an RCT with 75% follow-up is Level II, not Level I, no matter how large the trial.
When Level I evidence does not exist for your clinical question. Which is common in orthopaedics. Level III or IV evidence is still valid input. The authors are explicit: lower-level evidence retains value; the error is treating it as definitive rather than directional.
This 2003 JBJS editorial announced the journal's formal adoption of Level-of-Evidence ratings for all clinical articles. It introduces a five-level hierarchy applied across four study types: therapeutic, prognostic, diagnostic, and economic/decision modeling. The framework sets the vocabulary that every orthopaedic trainee uses when critically appraising the literature.
Every time you read a study, the first question is: what level of evidence is this, and does the conclusion match that level? This framework gives you the answer before you read the results. A retrospective cohort is Level III therapeutic evidence at best — it can generate hypotheses, but it cannot establish treatment superiority the way an RCT can.
Use the 80% follow-up rule as a quick quality filter: an RCT with 75% follow-up is Level II, not Level I, no matter how large the trial.
When Level I evidence does not exist for your clinical question. Which is common in orthopaedics. Level III or IV evidence is still valid input. The authors are explicit: lower-level evidence retains value; the error is treating it as definitive rather than directional.