Table 2. Grades of Recommendation for Summaries or Reviews of Orthopaedic Surgical Studies

A

Good evidence (Level I studies with consistent finding) for or against recommending intervention

B

Fair evidence (Level II or III studies with consistent findings) for or against recommending intervention

C

Poor quality evidence (Level IV or V studies with consistent findings) for or against recommending intervention

I

There is insufficient or conflicting evidence not allowing a recommendation for or against intervention