To get all stored procedures related to a table:

Option 1:

 SELECT DISTINCT so.name  
 FROM syscomments sc  
 INNER JOIN sysobjects so ON sc.id=so.id  
 WHERE sc.TEXT LIKE '%tablename%'  

Option2:

 SELECT DISTINCT o.name, o.xtype  
 FROM syscomments c  
 INNER JOIN sysobjects o ON c.id=o.id  
 WHERE c.TEXT LIKE '%tablename%'