RC: Joint Injections???

[WintersDwbob@aol.com]

I would like to get some input regarding joint injections   specifaclly  
coffin/navicular.  My horse supposedly has some "navicular" changes.  Now I 
don't know what normal is for my horse.  He is 13 yr old Arab gelding with 
600 LD miles in 3 years,  does 1st level Dressage and has very upright 
pasterns.  The foramens containing blood vessals are sli calcified and the 
wings of the navi  bone is showing some sli bonly deformations on the bottom 
of the bone next to coffin.  The vet wants to inject  glucosamine/cortisone/ 
w/silicone.  Never heard of this and worry if this is not a little radical.  
Have put horse on MSM  is still on Flex GL  and now isoxiprine.  HELP???  
Donna and BOB