Between February 1997 and October 1998, 11 patients(aged 11-19 years) with acute traumatic hemarthrosis underwent the arthroscopic procedure under extra epidural anesthesia.

19972～19988关节镜下诊治的11例青少创伤性膝关节血肿者。

Although epidural anesthesia is a common practice in neuraxial blockade, difficult access to the epidural space is a frequent problem in operating theaters.

虽然硬膜外阻断术是一种常用的区域麻醉，但上却经常遭遇到困难。