Following code will help to find all the Stored Procedures (SP) which are related to one or more specific tables. sp_help and sp_depends does not always return accurate results.
----Option 1
SELECT DISTINCT so.name
FROM
syscomments sc
INNER JOIN sysobjects so
ON sc.id=so.id
WHERE
sc.TEXT
LIKE '%tablename%'
----Option 2
SELECT DISTINCT o.name, o.xtype
FROM
syscomments c
INNER JOIN sysobjects o
ON c.id=o.id
WHERE c.TEXT LIKE '%tablename%'
Reference : Pinal Dave (http://www.SQLAuthority.com)