saving a dendrobium with really less number of roots

[Roberta]

What was the condition of the old medium? If good, the medium should be OK. (You are much more familiar with it than I am). The stick is important - new roots tips (the growing part) are very fragile. If the plant moves, those growing root tips can be damaged and then they stop growing. It is extremely important that the plant be held in place firmly until it can grow a good root system.