I don't understand the advice on not doing leg extension.  An orthopedic surgeon gave me that advice - to do extensions - and it worked.  I also take glucosamine. 
Here's a pretty good site with an assortment of things you can do....
 http://www.med.umich.edu/1libr/sma/sma_jumpersk_rex.htm 
		
		
		
		
		
			
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