My adductor and hamstring on the right hand side has become inflamed at the place where they join my ischium (sit bone). I suppose the impact of hitting the floor on my right side caused my saddle, encouraged by my left leg, to push the adductor sideways and strain it's joint with the bone, the hamstring is joined at the same place. At the same time of course my femour and all the other thigh muscles were pushing the the other way. That's my theory of what happened anyway.
Rest + ibuprofen.