nice to see you back after your first question,
In case of tendon injury, positive effect will be seen after 3 months by ultra sound however horses usually don’t go back to competition before a period of time of 6 months (for small lesions) or even 10-12 months when lesions are bigger. Remember, stem cells improve healing but to not fasten the process.
In case of joint inflammation, you can observe improvement after only 1 or 2 weeks and horses go usually back to work after month.
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Have a nice day
Nadia from Vetbiobank Equine Team