Fig. 5.
Forest plot of collapse of femoral head. CD, core decompression; CI, confidence interval. Statistical analysis, chi-squared test.
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.