put a cast on his foot是什么意思

请教，put a cast on his foot是什么意思！ Yao could undergo surgery to place screws across the bone between his ankles and foot, or put a cast on his foot. 中的put a cast on his foot是什么意思，这是怎样的一种治疗方案！请大家帮忙！   

参考案 应该就是加石膏固定治疗的意思
原意思是“在脚上带上模具”

其他回   cast 在这是石膏的意思
用石膏固定脚
该回答在3月2日 15:27由回者修改过 用石膏来固定他的骨折的脚，以致不让骨头一直活动难以结合。