What is the success rate on a bone stimulator?

Could you please elaborate on the success rate of a bone stimulator? I'm curious to know if this medical device has proven to be effective in accelerating bone healing and if there are any studies or research papers that support its use. Additionally, are there any specific conditions or circumstances where a bone stimulator may be more or less effective? It would be helpful to have a general understanding of the percentage of patients who have experienced positive outcomes with this treatment.