Shetland Has Stiff Knee Joints?

[staceyn]

10yo shetland gelding , doesnt seem to bother when walking around , when you pick his feet out the knee joint is very stiff and quite hard to bend on all four legs mainly front. I have given him american msm powder or something which was recommended to help loosen the stiffness.

Anyone got any better ideas for a supplement to add to his feed that is not £30 a small tub.

Would cod liver oil or glucosamine do the same job?

Thanks