Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pain on movement at 30 minutes after block placement.
Duval and Tweedie's trim and fill analysis: blue circles indicate studies found, and red circles are imputed studies. Correcting for the possibility of publication bias would give an estimated standardized mean difference of ‐0.88 (95% confidence interval ‐1.07 to ‐070).
