打着石膏
If a part of your body is in a cast, it has a plaster cast around it to protect it while a broken bone repairs itself.
  My leg was in a cast for about six weeks. 我的腿打了6周左右的石膏。 
 He'd broken his wrist and it was in a cast.
 Her forearm will be in a cast for five weeks.
 He's expected to be in a cast for the next two months.
 The cartilage tore and she was in a cast for four weeks.
 One of his front paws was in a cast.
 How long will he be in a cast?
 See also: cast noun (SHAPE)