Did they exist? Is there anything out there to give orally or in the muscle or whatever that would help as much as joint injections?

I have moved to PRP for myself and my horse/s. PRP is using your own body to heal itself. PRP will not work on all issues, soft tissue issues should respond, bone-on-bone will not. It works so much different than steroid injections tho. It causes a healing inflammatory response. I am in a whole lotta pain for several days after my PRP. But then as the pain fades it takes the pain that was before PRP with it. I am sure it does the same with a horse. Demon gets PRP in a stifle 1x or 2x per year. A week off and she is back to working soft and round. When she pops up when asked to cross over I know it's time again. The best thing about PRP is that it does no damage to tissues. Steroids are pretty destructive to body tissue. That's why they work less and less each time you give them. The expectation with PRP is to heal the tissues. 

Nothing is going to replace a joint injection but there are some injectables, like Adequan, Polyglycan, Summit that might stretch out the time between injections . 
there are several non steroidal options available now as an alternative joint injection. A2 is a macroglobulan, antiinflammatory, there is IRAP or PROStride , Renovo (more regenerative than anti inflammatory) and several others. Depends on what joint you're doing, whether it's high or low motion, what the problem is, etc

What does Arthramid do?  

Arthramid is a polyachrylamide hydrogel, like Noltrex. Spryng is a hydrogel but it is a collagen/elastin product. They are sold as a "joint cushion". The few experiences I've had with them (Noltrex and Spryng) have been disasters. 

What is PRP?

Platelet Rich Plasma - they take the subjects blood and spin it down to separate out the PRP and inject that into the injury or issue site. 

Just curious, what are you guys paying for IRAP?