Sorry to clear up confusion in the beginning of my last post I meant long riding. We have indeed progressed to riding in terms of I'm on his back and he is allowed to walk around for a few minutes, but nothing too strenuous yet. He also still in his small paddock. He enjoyed the visit with his herd today and hopefully he will be allowed 24/7 turnout with them again soon.
It has been raining a lot down here and the fear is he will run around with them, slip in a mud pit and be back to square 1. Vet has also informed me thick deep mud is horrid for stifle injuries. So we are steering clear of it.